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1.
Duygu Sahin Zeliha Hayvali 《Journal of inclusion phenomena and macrocyclic chemistry》2012,72(3-4):289-297
New benzo-15-crown-5 derivatives containing nitro, amine and imine groups were prepared. Nitro compound (1) was prepared after the reaction?4′,5′-bis(bromethyl)benzo-15-crown-5 and o-nitrophenol in the presence of NaOH. After reduction process by using hydrazine hydrate and Pd/C amine compound (2) was formed. New crown ether imine compounds (3–5) were synthesized by the condensation of corresponding crown ether diamine (2) with salicylaldehyde derivatives. Sodium complexes of the crown compounds (1a–5a) form crystalline 1:1 (Na+: ligand) complexes with sodium perchlorate. Nickel(II) complexes (3b–5b) with 1:1 (Ni2+:ligand) stoichiometries were also been synthesized from the Schiff bases (3–5). The results indicated that the Schiff base ligands coordinated through the azomethine nitrogen and phenolic oxygen. The extraction ability of compounds (1, 3, 4 and 5) were also evaluated in chloroform by using several alkali and transition metal picrates such as Li+, Na+, K+, Cr3+, Mn2+, Ni2+, Cu2+, Zn2+ and Pb2+. 相似文献
2.
A series of benzyloxybenzaldehyde derivatives (1-4) were synthesized by the reactions of 4-(bromomethyl)benzonitrile with 4-hydroxy-3-methoxybenzaldehyde (vanillin), 2-hydroxy-3-methoxybenzaldehyde (o-vanillin), 2-hydroxy-4-methoxybenzaldehyde and 2-hydroxy-5-methoxybenzaldehyde. Condensation reactions among the new benzyloxybenzaldehyde derivatives (1-4) with 4′-aminobenzo-15-crown-5 yielded the new Schiff base compounds (5-8). Sodium complexes (5a-8a) and potassium complexes (5b-8b) were prepared with NaClO4 and KI, respectively. All of these synthesized compounds were characterized on the basis of FT-IR, 1H and 13C NMR, mass spectrometry and elemental analyses data. The solid state structures of compounds 8 and 5a were determined by X-ray crystallography. The extraction abilities of compounds 5-8 were also evaluated in CH2Cl2 by using several main group and transition metal picrates, such as Na+, K+, Pb2+, Cr3+, Ni2+, Cu2+ and Zn2+. 相似文献
3.
Seiichi Inokuma 《Tetrahedron》2004,60(9):2043-2050
Biscrown ethers 2a-c and 3a-c arranged at a cyclobutane ring were prepared by intermolecular [2+2] photocycloaddition of vinylated benzocrown ethers. The complexing behavior of 2a-c toward alkali metal cations was evaluated by ESI-MS analysis, liquid-liquid extraction, and the comparison of complexing stability constant. An intramolecular sandwich-type 1:1 (host/guest) complexation was observed by ESI-MS analysis in the competitive system where 2a-Na+, 2b-K+, and 2c-Cs+ were formed selectively. In the liquid-liquid extraction, however, 2a hardly extracted any cation, while both 2b and 2c efficiently extracted larger cations such as K+, Rb+, and Cs+. It was found that the complexing stability constant of 2a-Na+ is lower than that of benzo-15-crown-5-Na+ though extraordinarily high values were obtained for 2b-K+ and 2c-Cs+ complexes compared with those of 18-crown-6-K+ and dibenzo-24-crown-8-Cs+ complexes, respectively. Hence, the excellent complexing ability was achieved by using the cyclobutane ring, which strongly preorganized two benzocrown-ether moieties for the larger alkali metal cations. 相似文献
4.
Marina S. Fonari Yurii A. Simonov Gabriele Bocelli Eduard V. Ganin Wen-Jwu Wang Sergei M. Pluzhnik-Gladyr Vyacheslav V. Tkachyuk Sergei A. Kotlyar Gerbert L. Kamalov 《Journal of inclusion phenomena and macrocyclic chemistry》2008,61(3-4):367-375
Four novel complexes of 2,4-dithiouracil (pyrimidine-2,4(1H,3H)-dithione, DTU) with 18-membered benzo- and dibenzo-crown ethers were synthesized in approximately the same conditions and studied by single crystal diffraction. Hydrogen bonding was observed to be the most important for the complexation in the solid state but π–π interactions also contribute to it. The crystalline monohydrates of the 1:1:1 stoichiometry are recorded for 4-bromo- and 4-nitrobenzo-18-crown-6 (complexes 1 and 2), while complexes with [2.4]dibenzo- and thia[1.5]dibenzo-18-crown-6 (complexes 3 and 4) represent anhydrous adducts of the 2:2 ratio. The crystal structures reveal three supramolecular structural motifs: the alternative chain for the ternary complex 1 and two types of capsules for complexes 2?4 where the DTU dimers are encapsulated inside the space restricted by two crown molecules. 相似文献
5.
Yetkin Gök Senem Akkoç Mehmet Akkurt Muhammad Nawaz Tahir 《Journal of the Iranian Chemical Society》2014,11(6):1767-1774
The nine new heteroaryl-substituted imidazolidinium (1a–c), pyrimidinium (2a–c) and diazepinium (3a–c) salts as N-heterocyclic carbene (NHC) precursors were synthesized in good yields and entirely characterized using elemental analyses and conventional spectroscopic methods. In situ formed complexes from heterocyclic salts (1–3), Pd(OAc)2 and in the presence of KOBu t as a base were tested as catalysts for the Mizoroki–Heck coupling reaction in an aqueous media and very high yields were achieved. 1,3-Di(5-methylthiophen-2-ylmethyl)pyrimidinium hexafluorophosphate salt (2b) was structurally characterized by single-crystal X-ray diffraction. In the 2b compound (C16H21N2S2)+[PF6]?, the terminal thiophene rings are twisted with a dihedral angle of 72.8(3)°. In the pyrimidine ring, the three successive C atoms between the N atoms are disordered over two positions [occupancy ratio 0.753(12):0.247(12)]. In the crystal, neighboring molecules are linked by C–H…F hydrogen bonds, running along the b axis. 相似文献
6.
A. N. Chekhlov 《Russian Journal of Inorganic Chemistry》2008,53(11):1763-1770
Two complexes are synthesized: diaquabromo(18-crown-6)rubidium [RbBr(18-crown-6)(H2O)2] (I) and triaqua(18-crown-6)barium dibromide monohydrate [Ba(18-crown-6)(H2O)3]2+ 2Br? · H2O (II). The orthorhombic structure of compound I (space group Pnma, a = 10.124 Å, b = 15.205 Å, c = 12.544 Å, Z = 4) and the monoclinic structure of compound II (space group C 2/c, a = 17.910 Å, b = 10.315 Å, c = 14.879 Å, β = 123.23°, Z = 4) are determined by a direct method and refined by the full-matrix least-squares method in the anisotropic approximation to R = 0.063 (I) and 0.042 (II) for all 2293 (I) and 3363 (II) independent measured reflections (CAD-4 automated diffractometer, λMoK α). The complex molecule [RbBr(18-crown-6)(H2O)2] in compound I and the randomly disordered cation [Ba(18-crown-6)(H2O)3]2+ in compound II are of the host-guest type: their Rb+ or Ba2+ cation (its coordination number is nine) is located in the cavity of the 18-crown-6 ligand and coordinated by all six O atoms. In structure I, the coordination polyhedron of Rb+ is a distorted hexagonal pyramid with a triple apex at the Br? ligand and two O atoms of the water molecules. In structure II, the Ba2+ polyhedron is a distorted hexagonal bipyramid with one apex at the O atom of the water molecule and the other split apex at two O atoms of water molecules. 相似文献
7.
Chao-Hu Xiao Jia-Cheng Liu Xue-Yan Song Yun-Xia Yang Dong-Cheng Hu Chang-Dai Si 《Transition Metal Chemistry》2013,38(3):307-311
The complexes [Fe(bpz*mpy)2](ClO4)2 (1a), [Cu(bpz*mpy)2](ClO4)2 (1b) and [Ag(bpz*mpy)(Ph3P)](ClO4) · H2O (2) (bpz*mpy = pyridin-2-yl-bis(3,5-dimethylpyrazol-1-yl)methane) have been synthesized and characterized by physicochemical and spectroscopic methods. X-ray crystallographic analysis reveals that the central FeII and CuII ions in complexes 1a and 1b are located on a twofold rotation axis and have a distorted octahedral coordination sphere, while the AgI center in complex 2 is tetrahedrally coordinated. The electrochemical properties of complex 1b have been investigated. Furthermore, a variable temperature magnetic susceptibility study of complex 1a has also been performed over the measured temperature range 2–300 K. 相似文献
8.
Dmitry S. Perekalin Valentin V. Novikov Maddalena Corsini Alexander R. Kudinov 《Journal of organometallic chemistry》2010,695(8):1200-1204
The reactions of benzo-15-crown-5 and dibenzo-18-crown-6 with 1 equiv. of [(mes)Ru(MeNO2)3]2+ (mes = 1,3,5-C6H3Me3) give the mononuclear complexes [(mes)Ru(η6-benzo-15-crown-5)]2+ (1) and [(mes)Ru(η6-dibenzo-18-crown-6)]2+ (2) in 50% yield. Similar reaction with 2 equiv. of [(mes)Ru(MeNO2)3]2+ produces the dinuclear complex [(μ-η6:η6-dibenzo-18-crown-6)Ru2(mes)2]4+ (3) in 96% yield as a 2:3 mixture of cis- and trans-isomers. Structures of 2(OTf)2 and trans-3(OTf)4 were confirmed by X-ray diffraction. The NMR titration showed that mononuclear dications 1 and 2 bind Na+ ion less effective (Ka = 600 and 250 M-1) than free benzo-15-crown-5 and dibenzo-18-crown-6 (Ka = 2 × 105 and 5 × 106 M−1). The dinuclear tetracation 3 does not bind Na+ within measurable limits of NMR titration method. The electrochemical behaviour of complexes 1-3 was studied in propylene carbonate solution. They exhibit a partially chemically reversible Ru(II)/Ru(I) reduction, which in the case of the dinuclear complex 3 proceeds through two slightly separated steps. The redox activity of the complexes is substantially unaffected by the presence of sodium ion. 相似文献
9.
M. A. Uvarova E. V. Kushan M. V. Andreev A. O. Voroshilina S. E. Nefedov 《Russian Journal of Inorganic Chemistry》2012,57(9):1232-1243
The reaction of Co3(??-OOCBu t )6(NEt3)2 with 1,10-phenanthroline or 2,2??-dipyridyl in benzene at room temperature yields L2Co2(??-OH2)(??-OOCBu t )4 complexes (L2 = Phen (1a) and Dipy (1b)). The reaction of n1a (1b) with 3,5-dimethylpyrazole gives a mixture of L2Co(Hdmpz)2(OOCBu t )2 complexes (2a, 2b) and L2Co(Hdmpz)(OOCBu t )2 (3a, 3b), and their yield is determined by the ratio of the initial reagents. As distinct from pivalates, for cobalt(II) phenanthroline-benzoate, only the (Phen)Co(Hdmpz)2(OOCPh)2 complex (4) has been isolated. The structures of the synthesized compounds have been determined by X-ray crystallography. 相似文献
10.
E. N. Ushakov S. P. Gromov O. A. Fedorova M. V. Alfimov 《Russian Chemical Bulletin》1997,46(3):463-471
Complexation of styryl dyes containing theN-phenylaza-15-crown-5 fragment (trans-2a,b) with Ca2+ ions in MeCN was studied. Unlike cationic dyetrans-2a, betainetrans-2b forms both complexes of 1∶1 stoichiometry and aggregates consisting of four dye molecules and one Ca2+ ion. Cation-induced aggregation was observed also for the analog of dyetrans-2b, which contains a dimethylamino group instead of an azacrown ether fragment (trans-3). Apparently, the interaction between a metal cation and sulfo groups of moleculestrans-2b ortrans-3 makes the main contribution to the stability of aggregates. The dependence of the stability of aggregates on the nature of the metal cation was studied. 相似文献
11.
Christof Kratky Wolfgang Reischl Elisabeth Altmann Erich Zbiral 《Monatshefte für Chemie / Chemical Monthly》1982,113(4):439-448
Oxidation of the α- and β-4-phenyl-1,2,4-triazolin-3,5-dione adducts of vitamin D3 (2 and1) withMCPBA yields two diastereomeric mixtures of the (5,10)-(7,8)-dioxiranes3 a,3 b,3 c and4 a,4 b respectively. The corresponding benzoates5 a,5 b,6 a and6 b were prepared and the X-ray crystal structure of5 b was determined. This analysis proved5 b to be the (5R, 1 OS)-(7R, 8R)-dioxirane of the β-resp. (6S)-4-phenyl-1,2,4-triazolin-3,5-dione adduct1 of vitamin D3. 相似文献
12.
Dr. W. Wendelin 《Monatshefte für Chemie / Chemical Monthly》1974,105(2):382-398
Crotonaldehyde resp. cinnamaldehyde react with guanidiniumchloride to give 2-amino-6-guanidinio-4-methyl-3.4.5.6-tetrahydro-1H-pyrimidiniumdichloride (4 a) resp. 6-hydroxy-4-phenylpyrimidiniumchloride3 b and the 4.6-dihydroxy-2.8-dimethyl (resp. 2.8-diphenyl)octahydropyrimido[1.2?a]pyrimidiniumchlorides6 a and6 b, resp. Action of 2.4-(or 2.6-)xylenol on4 a resp.3 b yields 2-amino-6-[2(or 4)-hydroxy-3.5-dimethylphenyl]-4-methyl-(resp. 4-phenyl)-3.4.5.6-tetrahydro-1H-pyrimidiniumchlorides (8 a resp.8 b or9 a resp.9 b), which are transformed to the zwitterionic compounds10 a–11 b by aqu. NaOH.6 a reacts with 2.4-xylenol to give the triazaoxabenzanthraceniumchlorid12 a·HCl (prove for the structure given for6 a). The chemical properties and the NMR-, UV-, mass- and IR-spectra of the compounds are discussed. 相似文献
13.
A. N. Chekhlov 《Russian Journal of Coordination Chemistry》2006,32(9):632-638
Two complexes, namely, (18-crown-6)bis(perchlorato-O,O′)strontium (I) and (18-crown-6)bis(perchlorato-O,O′)barium (II), are synthesized. Their crystal structures are determined by X-ray diffraction analysis. The structures of I (space group P21/c, a = 15.266 Å, b = 11.080 Å, c = 13.235 Å, β = 109.20°, Z = 4) and II (space group P21/n, a = 8.330 Å, b = 11.202 Å, c = 11.752 Å, β = 98.38°, Z = 2) are solved by a direct method and refined by the full-matrix least-squares method in the anisotropic approximation to R = 0.077 (I) and 0.041 (II) against 3714 (I) and 2478 (II) independent reflections (CAD-4 diffractometer, λMoK α radiation). Complex molecules [Sr(18C6)(ClO4)2] in the structure of I and [Ba(18C6)(ClO4)2] in II (in the inversion center)—are of the host-guest type. The Sr2+ or Ba2+ cation is localized in the center of a cavity of the 18-crown-6 ligand and coordinated by its all six O atoms. In compounds I and II, the coordination polyhedron of the Sr2+ and Ba2+ cations (coordination number 10) can be described as a distorted hexagonal bipyramid with two bifurcated vertices at two O atoms of two ClO 4 ? ligands, which are disordered in I and II and each of them has two orientations. 相似文献
14.
L. Kh. Minacheva P. K. Sazonov V. S. Sergienko G. A. Artamkina I. P. Beletskaya A. Yu. Tsivadze 《Russian Journal of Inorganic Chemistry》2006,51(7):1071-1081
It has been shown that N,N’-diaryldiaza-18-crown-6 ethers with p-dimethylamino-and p-methoxy groups in the benzene ring (aryl is 4-Mc2NC6H4) (I) and 4-MeOC6H4 (II) form complexes with potassium and barium salts. The influence of these salts on the UV and 1H NMR spectra of crown ethers I and II has been studied. The stability constants (logβ) of the complexes increase in the series II · Ba(ClO4)2 (2.0), I · Ba(ClO4)2 (2.3), II · KBr (2.8), I · KBr (3.0). N,N’-bis(4-dimethylphenylamine)diaza-18-crown-6 (L, I) and its complex with barium perchlorate Ba(ClO4)2 · L (III) are characterized by X-ray crystallography. The crystals of I are monoclinic: a = 13.778(2) Å, b = 5.9731(9) Å, c = 17.542(3) Å, β = 106.65(1)°, V = 1383.1(4) Å3, Z = 2, space group P21/n, R = 0.0374 for 990 reflections with I > 2σ(I). The crystals of III are monoclinic: a = 17.275(4) Å, b = 8.017(2) Å, c = 26.935(4) Å, β = 100.47(2)°, V = 3669(1) Å3, Z = 4, space group C2/c, R = 0.0320 for 1897 reflections with I > 2σ(I). The molecules of I and III are centrosymmetric. In III, the Ba atom is in the center of substituted diaza-18-crown-6 (DA18C6). The Ba atom is coordinated by all six donor atoms of diaza-18-crown-6 (av. Ba-O, 2.779(3) Å; Ba-N, 3.004(4) Å) and four oxygen atoms of two asymmetrically bound perchlorate groups (Ba-O, 2.832(4) and 3.031(4) Å) arranged below and above the plane of substituted diaza-18-crown-6. The conformations of the macrocycle in free and coordinated L are different. 相似文献
15.
A. N. Chekhlov 《Russian Journal of Inorganic Chemistry》2008,53(8):1197-1202
Two crystalline host-guest complexes are synthesized and studied using X-ray diffraction analysis: (18-crown-6)sodium tribromide [Na(18-crown-6)]+ · Br 3 ? (I) and (18-crown-6)potassium tribromide (with an admixture of bromodiiodide) [K(18-crown-6)]+ · (Br0.25I2.75)? (II). The structures of compound I (space group P21/n, a = 8.957 Å, b = 8.288 Å, c = 14.054 Å, β = 104.80°, Z = 2) and compound II (space group Cc, a = 8.417 Å, b = 15.147 Å, c = 17.445 Å, β = 99.01°, Z = 4) are solved by a direct method and refined by the full-matrix least-squares method in the anisotropic approximation to R = 0.098 (I) and 0.036 (II) for all 2311 (I) and 2678 (II) independent measured reflections on a CAD-4 automated diffractometer (λMoK α). Similar crystalline complexes I and II exist as infinite chains of alternating complex cations and trihalide anions linked to each other through weak Na-Br or K-I coordination bonds. In [Na(18-crown-6)]+ and [K(18-crown-6)]+ complex cations, the Na+ or K+ cation (coordination number is eight) is located in the center of the cavity of the 18-crown-6 ligand and coordinated by the six O atoms and two terminal Br or I atoms of two trihalide anions lying on opposite sides of the rms plane of the crown ligand. 相似文献
16.
Mukesh Kumar Atal Jyoti Jain Veena Dhayal Meena Nagar Rakesh Bohra Kuldeep S. Rathore Narendra S. Saxena 《Journal of Sol-Gel Science and Technology》2013,67(1):88-96
A glycol ether modified precursor, [Nb{O(CH2CH2O)2}(OPri)3] (A) was prepared by the reaction of Nb(OPri)5 with O(CH2CH2OH)2 in 1:1 molar ratio in anhydrous benzene. Further reactions of A with a variety of internally functionalized oximes in different molar ratios, yielded heteroleptic complexes of the type, [Nb{O(CH2CH2O)2}(OPri)3?n{ON = C(CH3)(Ar)}n] (1–9) {where Ar = C4H3O-2, n = 1 [1], n = 2 [2], n = 3 [3]; C4H3S-2, n = 1 [4], n = 2 [5], n = 3 [6]; C5H4N-2, n = 1 [7], n = 2 [8], n = 3 [9]}. All the above derivatives have been characterized by elemental analyses, FT-IR, NMR (1H, 13C {1H}) and FAB mass studies. Spectral studies of 1–9 suggest the presence of mono- and bi-dentate mode of oxime moieties, in the solution and in the solid states, respectively. FAB mass studies indicate monomeric nature for 3 and dimeric nature for A. TG curves of A and 6 show their low thermal stability. Soft transformation of A and 3 to pure niobia, a and b, respectively have been carried out by sol–gel technique. The XRD patterns of niobia a and b suggest the formation of nano-size crystallites of average size of 10.8 and 19.5 nm, respectively. The XRD patterns also indicate the formation of monoclinic phase of the niobia in both the cases. Absorption spectra of a and b suggest energy band gaps of 4.95 and 4.39 eV, respectively. 相似文献
17.
Prof. Dr. Otto Hromatka Dieter Binder Karl Eichinger 《Monatshefte für Chemie / Chemical Monthly》1975,106(2):555-558
The synthesis of 1-(3-thienyl)-benzimidazol-2-ones (3 a and4), described in an earlier paper1, has been further investigated. The Na-salt of3 a is converted to a benzimidazolone substituted in position 3 (3 b). Dehydrogenation of the thiophene nucleus of3 a with chloranil yields5 a, which undergoes substitution in position 3 with Cl(CH2)2N(CH3)2 to give5 b. Monochlorination of5 a yields5 c, the structure of which is confirmed by1H-NMR-spectroscopy.5 d is obtained by reaction of the Na-salt of5 c with Cl(CH2)2N(CH3)2. 相似文献
18.
V. P. Zelenov A. A. Voronin A. M. Churakov Yu. A. Strelenko M. I. Struchkova V. A. Tartakovsky 《Russian Chemical Bulletin》2013,62(1):117-122
3-Amino-4-(tert-butyl-NNO-azoxy)furoxan (1a) and 4-amino-3-(tert-butyl-NNO-azoxy)-furoxan (1b) and their acetyl derivatives 6a,b were obtained. The equilibria 1a ai 1b and 6a ? 6b were studied. Furoxan 6b can undergo thermal rearrangement into 3-[(tert-butyl-NNO-azoxy)(nitro)methyl]-5-methyl-1,2,4-oxadiazole (7), prolonged heating of which gives N-(2-tert-butyl-5-nitro-1-oxido-2H-1,2,3-triazol-4-yl)acetamide (8). With the transformation 7 → 8 as an example, the possibility of participation of the azoxy group in the Boulton-Katritzky rearrangements was demonstrated for the first time. 相似文献
19.
Shigekazu Matsui Yasunori Yoshida Thomas P. Spaniol Jun Okuda 《Journal of organometallic chemistry》2004,689(7):1155-1164
A series of pyrrolyl-imines HL1-6 was prepared by the condensation of pyrrole-2-carboxyaldehyde with different amines. The reaction of 2 equiv of pyrrolyl-imine with tetrabenzyl complexes of hafnium and zirconium M(CH2Ph)4 (M=Hf or Zr) gave dibenzyl complexes (L3-6)2M(CH2Ph)2, which were characterized by NMR spectroscopy and crystal structure analysis. NMR spectra of the complexes with secondary alkyl substituents at the imine nitrogen (isopropyl: 3a, 4-tert-butylcyclohexyl: 4a and 4b) suggest that rapid racemization between Δ and Λ configurations occurs in solution on the NMR time scale. The complexes with pyrrolide-imine ligands with a tertiary alkyl group such as tert-butyl (5a and 5b) or 1-adamantyl (6a and 6b) at the imine nitrogen possess cis-configured benzyl groups. Hafnium complexes 5a and 6a react with B(C6F5)3 in bromobenzene-d5 to give the corresponding cationic benzyl complexes, which exhibit high activity for ethylene polymerization (5a: 2242 kg-polymer/ mol-Hf h bar, 6a: 2096 kg-polymer/ mol-Hf h bar). Zirconium complexes 5b and 6b display a remarkably high ethylene polymerization activity when activated with methylaluminoxane (5b: 17,952 kg-polymer/mol-Zr h bar, 6b: 22,944 kg-polymer/mol-Zr h bar). 相似文献
20.
The basic product synthesized byTraube andSchwarz from mesityl oxide and guanidine has not been 4.4.6-trimethyl-4.5-dihydro-2-pyrimidinamine (1), but a mixture containing the 4.4.6-trimethyl-3.4-dihydro-2(1H)-pyrimidinimine (resp. an isomeric pyrimidinamine)2 a (resp.2 b, 2 c) and the dimeric 4.4′-methylenedi[2(1H)-pyrimidinimine] (resp. an isomeric methylenedipyrimidinamine)3 a (resp.3 b, 2 c) and the dimerisation reaction were studied in a series of experiments. The product of the reaction of guanidine and phorone is not the guanidinopropylpyrimidine8 4, but the 4.4′-spirobi[2(1H)-pyrimidinimine] (resp. a spirobipyrimidinamine)11 a (resp.11 b, 11 c). No determination was possible on the basis of NMR whether the condensation products of guanidine—in solutions ofDMSO-d6—are pyrimidinimines (2 a, 3 a, 11 a) or pyrimidinamines (2 b resp.2 c, 3 b resp.3 c, 11 b resp.11 c) or mixtures of the isomeric compounds. The NMR-and mass spectra of2 a (resp.2 b, 2 c),3 a (resp.3 b, 3 c),11 a (resp.11 b, 11 c) and their derivates are discussed. 相似文献