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1.
Uwe Klingebiel Peter Werner Prof. Dr. Anton Meller 《Monatshefte für Chemie / Chemical Monthly》1976,107(4):939-943
The reaction of RSiCl3 (R=CH3, C2H5, C6H5) and R2SiCl2 (R=CH3) with one mole of the phosphenimidous amides R2N–P=NR [R=R=Si(CH3)3; R=Si(CH3)3, R=C(CH3)3] yieds a four membered PN2Si-ring system under elimination of (CH3)3SiCl. 相似文献
2.
Adriano Duatti Simonetta Benetti Roberto Rossi Luciano Magon Ulderico Mazzi 《Transition Metal Chemistry》1981,6(6):380-381
Summary The reactions oftrans-ReOCl3(PPh3)2 with vinyl amides such as RCOCH=C(R)NH2, where R = CH2CH2CO2H and R = Ph and C6H13; or R = Me, CH2CH2CO2Me and R = Ph, give complexes of the type ReOCl2-[RC(O–)=CHC(R)=NH]PPh3, the coordination geometry of which have been deduced from i.r. and1H n.m.r. spectroscopic data. 相似文献
3.
M. G. Voronkov O. G. Yarosh L. V. Shchukina A. A. Tatarinova 《Russian Chemical Bulletin》1976,25(6):1338-1340
Conclusions A method was developed for the synthesis of acetoxy-trans-1,2-disilylethylenes of formula (CH3COO)n(CH3)2–nRSiCH=CHSi(CH3)R(OCOCH3), where R and R=alkyl, and n=0 or 1. The corresponding silanols were obtained by the hydrolysis of the latter.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1395–1397, June, 1976. 相似文献
4.
R. A. Amriev O. P. Bondarenko F. K. Velichko R. P. Rilo 《Russian Chemical Bulletin》1985,34(10):2114-2117
Conclusions Together with dimethylformamide, iron pentacarbonyl initiates the telomerization of acrylonitrile, methyl acrylate, and methyl methacrylate with iodoform, resulting in the formation of telomeric homologs of the series CHI2(CH2CRI)nR and CHI2(CH2CHR)nR (n=1, 2; R=H, CH3; R=CN, COOCH3).Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2284–2287, October, 1985. 相似文献
5.
N. V. Kruglova 《Russian Chemical Bulletin》1990,39(12):2530-2533
Polychloroalkanes and -alkenes R(CH2)nCl (R=CHCl2CH2, CCl2=CH, n=1, 3) in dipolar aprotic solvents — dimethylformamide (DMF), dimethylsulfoxide (DMSO), hexamethylphosphoramide (HMPA) — at 130–150°C react selectively at the CH2Cl group with salts of carboxylic acids RCO2K(Na) to form dichloroesters RCO2· (CH2)nR (R=CHCl2CH2, CCl2=CH). In tetrachloroalkanes CCl3CH2(CH2)nCl (n = 1, 3, 5) under the same conditions the selectivity of the CCl3 and CH2Cl groups relative to the nucleophile RCO2K(Na) is altered — unsaturated esters RCO2(CH2)nCH=CCl2 are formed in one stage with yields of 75–90%. Under the selected conditions, high conversion of polychloroalkanes to esters is attained 3 to 5 times more rapidly than in acid media. The structure of the ester obtained has been confirmed by their PMR spectra.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2790–2793, December, 1990. 相似文献
6.
A study is made of ammonolysis of dialkyldichlorosilanes of the RR'SiCl2 series, where R = Me, Et, and R = Me(CH2)n (n = 1, 3, 5, 7, 8). With the lower members of the homologous series it takes place in accordance with a previously known equation. Ammonolysis of dialkyldichlorosilanes with big R radicals on the silicon atom gives both cyclic and linear ammonolysis products. 相似文献
7.
Bond strengths in RO-OOR, ROO-OH, and ROO-OOR (R, R = H, Me, Et, and Bu) molecules, calculated by the semiempirical quantum-chemical methods, were used to determine the enthalpies of formation of polyoxides RO
x
R (x = 3, 4) and related radicals and the bond strengths (D/kcal mol–1) in these molecules:D(ROOO-OR) = 33.2±0.9,D(ROOO-OH) = 37.5±0.7,D(R-O
x
R) = 76.0±1.2,D(H-000) = 58.6,D(R-000) = 42.8±0.8. A new value of Benson's polyoxide thermochemical increment, f
H°[O-(O)2] = 11.1±1.0 kcal mol–1, was suggested.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 2190–2193, September, 1996. 相似文献
8.
Bibasic tetradentateSchiff bases having the donor system OH–NX–NX–OH have been shown to form UO2(NO3)2(SBH2) type of derivatives [SBH2 is the molecule of the bibasic tetradentateSchiff bases such as HOC6H4C(R) N(CH2)
n
NC(R)C6H4OH (where R=H or CH3 andn=2 or 3) and HOC(R)CHC(CH3)N(CH2)
n
NC(CH3)CH C(R)OH (where R=CH3 or C6H5 andn=2 or 3)]. The 11 stoichiometry of these complexes is shown by elemental analysis and conductometric titrations. The molar conductence values in nitrobenzene indicate the non-electrolytic behaviour and the magnetic susceptibility measurements by the Gouy method show these complexes to be diamagnetic.With 1 Figure 相似文献
9.
Babak Borhan Bruce Hammock J. Seifert Barry W. Wilson 《Fresenius' Journal of Analytical Chemistry》1996,354(4):490-492
The development of a microassay for proteinase K esterase activity with carboxylic acid esters is reported using novel substrates of the general formula R-C(O)-XR. Highest rates of hydrolysis have been obtained with the O-phenyl esters CH3(CH2)n = 1 – 2-S-(CH2)n = 1 – 2 C(O)-O-phenyl and their thioester analogs in studies where R, X and R have been varied. The phenol release has been measured with 4-aminoantipyrine and potassium ferricyanide to determine the rates of O-phenyl ester hydrolyses. Thioester hydrolyses have been monitored continuously with 5,5-dithio-bis (2-nitrobenzoic acid). 相似文献
10.
Andrzej Wlodarczyk Anna Wlodarczyk John C. Jeffery Jon A. McCleverty Michael D. Ward 《Transition Metal Chemistry》1995,20(6):559-564
Summary
-Diketones react with [Mo(NO){HB(dmpz)3}I2] [HB (dmpz)3 = tris (3,5-dimethylpyrazolyl)borate] giving the cationic complexes [Mo(NO) {HB(dmpz)3}{OC(R)CRC-(R)O}]+ (R = R = Me, R = H, Me or n-Bu; R = R = Ph, R = H; R = Me, R = n-Bu, R = H), isolated as triiodide salts. Electrochemical studies show that these complexes exhibit three electrode processes: two associated with oxidation of I
inf3
sup–
and one with reduction of the metal-containing cation. Reduction of the cation where R = R = R = Me with cobaltocene afforded the neutral paramagnetic [Mo(NO) {HB(dmpz)3} {OC(Me)CMeC(Me)O}], which was characterized by i.r. and e.p.r. spectroscopy. In contrast, 3-chloropentane-2, 4-dione reacts efficiently with [Mo(NO){HB(dmpz)3}I2] giving the known chloro-analogue, [Mo(NO)-{HB(dmpz)3}Cl2], and no -diketonate complex was detected. The X-ray crystal structure determination of [Mo(NO){HB(dmpz)3} {OC(Me)CMeC(Me)O}]I3 confirms that the cation is six-coordinate and shows that the 559-01 (diketonate) bonds are slightly longer than in comparable compounds, implying that the -diketonate ligand is not such a strong -donor as alkoxide groups. 相似文献
11.
V. A. Pestunovich M. G. Voronkov é. Ya. Lukevits L. I. Libert 《Theoretical and Experimental Chemistry》1972,5(5):446-450
The proton-magnetic-resonance spectra were investigated for 19 -aminoethoxysilanes in the R4-nSi(OCH2CH2NR2)n and R3-m(CH2CH2OR)m series, where R=CH3, C2H5, or C6H5; R=H, CH3, C2H5, or Si(CH3)3; and the values of n and m are 1–4 and 1–3, respectively. In the Si-O-C-C-N system the effect of substituents at the nitrogen or silicon atoms is transmitted either by conjugation in the chain or, when the conjugation is broken, by an induction mechanism. 相似文献
12.
M. A. Mikhaleva L. N. Il'chenko V. P. Mamaev 《Chemistry of Heterocyclic Compounds》1974,10(6):715-719
It is shown that the reaction of benzalbisurea with 3-amino-5-hydroxy-1-R-pyrazoles gives 1-R-dipyrazolo[3,4-b:4,3-e]pyridine (R=CH3) or a spiro(pyrazole-4,5-pyrimidine) derivative (R=C6H5). Similar reactions of benzalbisurea with 3-hydroxy-5-amino-1-methylpyrazole give 2-methyldipyrazole[3,4-b:4,3-e]pyridine or substituted tetrahydropyrazolo[3,4-d] pyrimidine. Only the corresponding dipyrazolo[3,4-b:4,3-e]pyridines are formed in the reaction of 1-methylhydroxyaminopyrazoles with methylenebisurea.See [1] for communication XXXIX.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 823–827, June, 1974. 相似文献
13.
Uwe Klingebiel Jutta Neemann Prof. Dr. Anton Meller 《Monatshefte für Chemie / Chemical Monthly》1977,108(5):1099-1104
The reaction of fluorosilanes with lithium salts of bulky amines like tetramethyl-piperidine and di-tert. butylamine leads to stable aminofluorosilanes of the type R-SiF2-NRR [R=F, C(CH3)3, C6H5, C6H4N(CH3)2]. Lithium salts of silylamines react analogously: R2Si(NR-SiF2R)2 (R=R= =CH3, R=C6H5). An eight membered Si–N-ring is obtained in the reaction of a disubstituted silylaminofluorosilane with the dilithium salt of a silylamine. The mass-,1H-, and19F-NMR spectra of the above mentioned compounds are reported. 相似文献
14.
Summary The Schiff bases RC(OH)=CHC(R)=NNMeC(S)SMe (R = Ph,p-MeC6H4, R = Me; R = R = Ph) have been prepared by condensation of -diketones with -N-methyl-S-methyldithiocarbazate. By the loss of a proton they act as singly negatively charged tridentate ligands with oxygen, nitrogen and sulphur donor atoms (ONS). Iron forms the high-spin complexes [FeIII(ONS)2][FeIIICl4]. Copper(II), palladium(II), and platinum(II) yield the square-planar 1 : 1 complexes, M(ONS)CI (M = Cu, Pd, Pt) and Cu(ONS)NO3. Cobalt(II) and nickel(II) form high-spin, six-coordinate 1 : 2 complexes, M(ONS)2. For M = Ni and R = R = Ph, the complex is high-spin and octahedral, but when R = Ph orp-MeC6 H4 and R = Me, the complexes are diamagnetic and square-planar with nitrogen and sulphur (NS) coordinatio of the Schiff base, indicating that a change in the Rgroup can bring about a change in spin-state and stereochemistry of nickel.Part I: see ref. 1. 相似文献
15.
Michael Day Shariff E. Kabir Erich Wolf Edward Rosenberg Kenneth I. Hardcastle 《Journal of Cluster Science》1990,1(4):355-369
The synthesis of (-H)(-2-RRNCO2)Os3(CO)10 (R=R=CH3
2a; R=R=CH2CH3,2b; R=CH3, R=CH2CH3,2c) and their cyclic analogs (-H)(-2--CO2)Os3(CO)10(n=42d,n=5,2e) from carbon dioxide, secondary amine, and Os3(CO)10(CH3CN)2 (1) are reported. A solid-state structure of2c reveals a bonding mode for the carbamato ligand very similar to that observed for related carboxylato complexes. Compound2c crystallizes in the orthorombic space group Pbca witha=9.136 (3),b=15.310 (4) andc=30.361 (5) Å;V=4247 Å3,Z=8. Least-squares refinement of 2405 observed reflections gave a final agreement factor ofR=0.043 (R
w
=0.043). The reactivity of the complexes2a–2e was examined. Compound2c or2b give good yields of the cluster derivatives (-H)(-X)Os3(CO)10 (X=Cl,3; X=OCH3,4; X=N(CH3)2,7) when reacted with HX. Reaction of2a with P(CH3)3 at 68°C gives good yields of the otherwise difficult to obtain 1,1,2-(P(CH3)3)3Os3(CO)9 (5). Evidence is presented that suggests that2a–2e form by oxidative addition of preformed carbamic acids to1. 相似文献
16.
Zusammenfassung Arylhydrazon-cyanacetylcarbamidsäureäthylester (I) wurde durch Einwirkung einer Na2CO3-Lösung auf 1-Aryl-5-cyan-6-azauracile (II)1,2 cyclisiert. Nitrile (II) wurden durch Addition von Hydroxylamin in entsprechende Amidoxime (III) übergeführt, welche durch Kochen mit Acetanhydrid die zugehörigen 1-Aryl-5-[5-methyl-1,2,4-oxdiazolyl(3)]-6-azauracile (IV) lieferten.
Aryl hydrazone-cyanoacetylcarbamic acid ethyl esters (I) have been cyclized in Na2CO3 soln. yielding 1-aryl-5-cyano-6-azauraciles (II)1,2. Addition of NH2OH to the nitriles (II) gave the corresponding amidoximes (III), which by refluxing with Ac2O were converted to the corresponding 1-aryl-5-[5-methyl-1, 2, 4-oxdiazolyl(3)]-6-azauraciles (IV).相似文献
17.
Summary Binuclear organometallic palladium complexes of the general formulae Pd2[-(N-N)]R2L4(ClO4)2 and Pd2[-(N-N)]Cl2R2L2 [R = C6F5 or C6CI5; L = group VB or VIB ligand; (N-N') = 4,4-bipyridine] have been prepared by reacting the ligand (N-N) with compounds of the type Pd2(-CI)2R2L2 or PdOClO3RL2. Furthermore, polynuclear [PdR2(N-N)]x (R = Cl, C6F5 or C6Cl5) type complexes have been obtained by reaction of the ligand (N-N) with PdR2(tht)2, whilst treatment of [Pd2(-CI)2(C6F5)4](NBu4)2 with an excess of (N-N) leads to the polynuclearcis-[Pd(C6F5)z(N-N)]x species. Evidence for the structure of these compounds is obtained from their i.r. spectra. 相似文献
18.
M. D. Revenko N. V. Gérbéléu K. M. Indrichan 《Theoretical and Experimental Chemistry》1985,21(5):577-580
The passage of dry gaseous hydrogen chloride through chloroform solutions or acetone suspensions of S-substituted N1,N4-di(salicylidene)isothiosemicarbazidates of nickel (Ni(LRR)) has led to a demetallization reaction with the liberation in the free state of S-substituted N1,N4-di(salicylidene)isothiosemicarbazides with the general formula N2LRR (where R is H and R is CH3 (I); R is H and R is C2H5 (II); R is H and R is C3H7 (III); R is H and R is C7H7 (IV); and R is CH3 and R is CH3 (V)). The IR spectra of (I-IV) each showed bands characteristic for an aromatic ring and groups in the 1600–1500 cm–1 region, with a band of the deformation vibrations of an OH group at 1300 cm–1. The PMR spectra in CDCl3 each had two singlets at 12.15-11.25 and 9.00-8.36 ppm which were assigned, respectively, to the protons of an OH group and those of a =CH group. A multiplet in the 7.70-6.83 ppm region belonged to the protons of benzene rings. In the region of lower fields there were the signals of the substituents R and R. In the mass spectra of (I-V), the peaks of the molecular ions, and also the characteristic fragments OH, R, SR, and HSR have been detected.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 21, No. 5, pp. 604–608, September–October, 1985. 相似文献
19.
Summary The complexes (
5-C5H5)L(RN3R)Fe, where L = PPh3, P(OMe)3, P(OPh)3 or CO and R,R=p-MeC6H4 orp-ClC6H4, have been prepared by reaction of suitable iron halides with Ag(RN3R). The mechanism of formation of the Fe(RN3R) group is thought to involve, initially, an Fe-Ag bond. The bonding mode of the triazenido ligand is chelating in a six coordinate configuration. The spectroscopic results are discussed in relation to variations in the environment of the metal atom. 相似文献
20.
N. N. Vlasova S. A. Bol'shakova Yu. G. Skrypnik E. O. Tsetlina M. G. Voronkov 《Russian Chemical Bulletin》1979,28(1):190-191
Conclusions Depending on the ratio of the reactants and the reaction temperature, the reaction of benzenesulfonyl chloride with sodium trialkylsilylalkylthiolates R3Si(CH2)nSNa (R=Me, Et; n=1–3) leads either to labile S-phenyl S-trialkylsilylalkyl thiosulfonates or to their mixture with S,S-bis(trialkylsilylalkyl) disulfides.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 204–205, January, 1979. 相似文献