共查询到20条相似文献,搜索用时 46 毫秒
1.
Wolfgang Stadlbauer Otto Schmut Thomas Kappe 《Monatshefte für Chemie / Chemical Monthly》1980,111(5):1005-1013
Phenylmalonyl heterocyclic compounds such as the quinolones1a–c or3, benzoquinolizinones6a, b and the phenalenones8a, b can be converted to benzofuranes (2a–c, 7a, b and9a, b) by cyclodehydrogenation with Pd/C in boiling diphenyl ether. 2-Phenylchinchonic acid (10) reacts under the same conditions to the dimeric benzofuroquinoline12: the decarboxylated quinoline11 however gives the monomer13.
Herrn Prof. Dr.G. Zigeuner zur Vollendung seines 60. Lebensjahres gewidmet. 相似文献
2.
Adam Bartecki Bożena Bachmatiuk Maria Cieślak-Golonka Roman Gancarz 《Monatshefte für Chemie / Chemical Monthly》1980,111(4):851-861
The studies on reaction of newly obtained aminophosphonic acid diethyl ester derivatives of fluorene with Cr2O7
2–, CrO4
2–, CrO3Cl– and CrO3 have been investigated using electronic, infrared,Raman and NMR spectral methods. It has been found that the resulting compounds are of the type (AH)2Cr2O7, whereA stands for the organic part of the molecule. The organic cation and solvent effects on the electronic states of pseudotetrahedrally arranged Cr(VI) anions are discussed.
Spektroskopische Untersuchungen über Reaktionen von Chrom(VI)-Verbindungen mit Aminophosphonsäure-Estern
Zusammenfassung Es wurden Elektronen-, Ultrarot-,Raman- und NMR-spektroskopische Untersuchungen beschrieben, die an neuen Verbindungen durchgeführt wurden, welche als Reaktionsprodukte von Cr2O7 2–, CrO4 2–, CrO3Cl– und CrO3 mit Aminophosphonsäurediethylesterderivaten von Fluorene synthetisiert worden waren. Es wurde festgestellt, daß diese Verbindungen mit einer allgemeinen Formel (AH)2Cr2O7 beschrieben können werden, in derA den organischen Teil der Verbindungen bedeutet. Der Einfluß des organischen Kations wie auch der von Lösungsmitteln auf die Elektronenzustände des pseudotetraedrischen Cr(VI)-Anions wurde gleichfalls untersucht.相似文献
3.
Mohamed Hilmy Elnagdi Ezzat M. Zayed M. A. Elsayed Khalifa Said A. Ghozlan 《Monatshefte für Chemie / Chemical Monthly》1981,112(2):245-252
Diazotised 5-amino-3-methyl-4-phenyloyrazole (1) reacted with active methylene reagents and with -naphthol to yield the pyrazolo[1,5-c)-1,2,4-triazine derivatives2a-e and5. Compound1 reacted with benzoyl isothiocyanate and with phenyl isothiocyanate to yield the corresponding pyrazol-5-ylthiourea derivatives6a, b. 5a was converted into the thiourea derivative8 by the action of acids or alkalies. A synthesis of 2-methyl-3-phenyl-4,5,6,7-tetrahydropyrazolo[1,5-a]-pyrimidin-5-one from the reaction of -phenylacetoactonitrile (3-oxo-2-phenyl-butyric nitrile) and -cyanoethylhydrazine is reported.
Reaktionen mit heterocyclischen Amidinen, VII: Synthese einiger neuer Pyrazolo[1,5-c]-1,2,4-triazine, Pyrazolo[1,5-a]-1,3,5-triazine und Pyrazolo[1,5-a]pyrimidine
Zusammenfassung Diazotiertes 5-Amino-3-methyl-4-phenylpyrazol (1) reagiert mit einer aktiven Methylenkomponente und -Naphthol zu den Pyrazolo[1,5-c]-1,2,4-triazin-Derivaten2a-e und5. 1 ergibt mit Benzoylisothiocyanat und Phenylisothiocyanat die entsprechenden Pyrazol-5-yl-thioharnstoffe6a, b. 5a wurde mittels Säure oder Base in das Thioharnstoffderivat8 umgewandelt. Es wird über eine Synthese von 2-Methyl-3-phenyl-4,5,6,7-tetrahydropyrazolo[1,5-a]-pyrimidin-5-on aus -Phenylacetoacetonitril (3-Oxo-2-phenyl-butyronitril) und -Cyanoethylhydrazin berichtet.相似文献
4.
Janusz Jamrozik 《Monatshefte für Chemie / Chemical Monthly》1981,112(6-7):785-790
Condensation of 1,1,2,2,-tetrabromomethylcyclopropane with 1,8-dihydroxynaphthalene yielded the (7.7.1)-type propellane. The peri effect on the reaction and the product conformation is discussed. As a result condensation of 1,1-dibromomethylcyclopropane withperi-dihydroxynaphthalene gives the diether-type compound2 instead of the expected spirane2.
Jamrozik, J., Propellanes III. J. für prakt. Chemie, im Druck (1980). 相似文献
5.
Yassein M. Temerk 《Monatshefte für Chemie / Chemical Monthly》1979,110(1):139-147
The polarographic behaviour of the title compound in buffer solution ofpH 2–21 is discussed. The two observed waves in alkaline media (pH9.5) are assigned to the formation of hydrazo and the bishydrazo derivatives, whereas in acid solutions the reduction leads to cleavage of both two azo groups. The nature of the waves is investigated and a general mechanism for the reduction process in alkaline and acid media is suggested. The values of the kinetic parameters for the electrode reactions are reported.
Untersuchungen an Bisazo-Verbindungen I. Polarographisches Verhalten von 1-[4-(4-Natriumsulfonato-phenylazo)-3-natriumsulfonato-phenylazo]-2-naphthol in Lösungen mit verschiedenem pH an der tropfenden Quecksilber-Elektrode Polarographic behaviour of 1-[4-(4-sodiumsulfonato-phenylazo)-3-sodiumsulfonato-phenylazo]-2-naphthol in solutions of varyingpH at the dropping mercury electrode
Zusammenfassung Es wird das polarographische Verhalten der Titelverbindung in Pufferlösungen vompH 2–12 diskutiert. Die zwei im alkalischen Bereich (pH9,5) beobachteten Wellen werden der Bildung der Hydrazo- bzw. Bishydrazo-Derivate zugeordnet, im sauren Bereich führt die Reduktion zur Spaltung beider Azo-Gruppen. Die Natur der Wellen wird untersucht, und ein genereller Mechanismus für die Reduktion im alkalischen und sauren Bereich wird vorgeschlagen. Die kinetischen Parameter der Elektrodenreaktionen werden angegeben.相似文献
6.
Christoph Kratky Edgar Nachbaur Alois Popitsch 《Monatshefte für Chemie / Chemical Monthly》1981,112(4):529-532
A geometrical analysis on 22 crystal structures of Ag(I) compounds with hard bases demonstrates that the observed colour-changes from colourless to red depend on the number of Ag(I) atoms coordinating the donor atoms of the base.
Korrelation zwischen Farbe und Kristallstruktur in Silber(I)-VerbindungenKurze Mitteilung
Zusammenfassung Eine geometrische Analyse an 22 Kristallstrukturen von Ag(I)-Verbindungen mit harten Basen zeigt, daß sich die Farbe der Verbindungen mit steigender Anzahl von Silberatomen um die Donorzentren vertieft.相似文献
7.
Paul Peringer 《Monatshefte für Chemie / Chemical Monthly》1979,110(5):1123-1126
The exchange reaction ofR
2Hg and >N–Hg–N< compounds yielding organomercury—nitrogen compounds may be widely applied, as shown here in the synthesis ofN-phenylmercury-amides,-imides,-heterocycles and-triazenes. 相似文献
8.
在甲醇中氧化双[三(2-甲基-2-苯基)丙基锡]分别与吡嗪-2-甲酸、吲唑-3-甲酸反应,合成了2个三(2-甲基-2-苯基丙基)锡含N杂环羧酸酯(PhCMe2CH2)3Sn[O2C(C4N2H3)](1)和(PhCMe2CH2)3Sn[O2C(C7N2H5)](2)。经IR、1H和13C NMR、元素分析和X-射线单晶衍射表征结构。配合物1属单斜晶系,空间群P21/n,晶体学参数:a=1.209 31(7)nm,b=1.818 15(11)nm,c=1.491 39(9)nm,β=93.567(3)°,Z=4,V=3.272 8(3)nm3,Dc=1.302 Mg·m-3,μ(Mo Kα)=0.812 mm-1,F(000)=1 328,R1=0.027 5,wR2=0.067 0。配合物2属三斜晶系,空间群P1。晶体学参数:a=1.153 10(7)nm,b=1.819 73(11)nm,c=2.620 40(16)nm,α=86.866(2)°,β=87.063(2)°,γ=73.332(2)°,Z=6,V=5.255 9(6)nm3,Dc=1.288 Mg·m-3,μ(Mo Kα)=0.762 mm-1,F(000)=2 112,R1=0.037 4,wR2=0.092 5。1和2的中心锡原子均为畸变四面体构型。通过分子间C-H…O和N-H…N氢键作用,配合物2形成环状三聚体结构;两相邻三聚体间,经C-H…π作用进一步扩展成为六聚体。热重分析结果表明,1和2具有良好的热稳定性,分别在210、240℃以下可以稳定存在。毒性测试的初步结果表明,配合物1、2对石螺急性毒性较小,具有较好的环境相容性,且1的毒性低于2和苯丁锡。 相似文献
9.
The vibrational spectra of C6D5PX
2, (C6D5)2PX (X=H, Cl), (C6D5)3P and of the Cyclophosphanes (PC6H5)
n
and (PC6D5)
n
(n=5, 6) are reported. The spectra of the phenylphosphorouscompound D (the structure beeing unknown) are given too. The C6H5/C6D5 isotopic shift data in the lower frequency-region (600–100 cm–1) (facilitating the recognition of vibrational coupling effects) are used for vibrational assignments. 相似文献
10.
Hans Junek Burkhard Thierrichter Peter Wibmer 《Monatshefte für Chemie / Chemical Monthly》1979,110(2):483-492
The reactivity of 3-amino-2,4-dicyano-methyl-(1d) and-ethyl-crotonate (1e), resp., a new type of codimer from malononitrile and cyanoacetate, was investigated. Condensation reactions with aromatic aldehydes (2a-g), with heterocyclic aldehydes (2j-l), nitrosobenzenes (3a-c) ando-hydroxybenz-and-naphtaldehydes (4a-f), resp., are described, the differences in reactivity, compared with dimer malononitrile and dimeric forms of cyanoacetate (1a-c) are negligible. Condensation compounds of1a with cycloalkanones (5a-c) are able to cyclise with sulfur to cycloalkanonothieno-pyridines (6a-b), while the cycloalkano-derivatives of1d gave no ring closure.
Herrn Prof. Dr.O. E. Polansky zum 60. Geburtstag in Erinnerung an gemeinsame Tätigkeiten auf dem Gebiet der Nitrilchemie gewidmet. 相似文献
11.
The chromatographic performance of a Hypercarb™ column was studied using some five-membered heterocyclic compounds. Significant retention of these molecules was observed
with water/acetonitrile eluents. The influence of the organic modifier on retention was studied and interpreted on the basis
of intermolecular interactions. The order of retention of solutes on Hypercarb™ does follow their polarity order. Dispersion interactions undoubtedly have an influence, but do not determine the elution
order of solutes. From the results obtained, it appears that the retention of the investigated substances is defined by interaction
of polarized or polarizable functional groups in the samples with the graphite surface of the Hypercarb™. 相似文献
12.
A convenient general method of preparing 4-acylpyridazines (4) is reported. It involves homolytic acylation of ethyl-4-pyridazinecarboxylate yielding ethyl-5-acyl-4-pyridazinecarboxylates (2) which easily can be converted to4 by alkaline hydrolysis followed by decarboxylation. The hitherto unknown pyridazino[4,5-d]pyridazine-1 (2H) ones bearing an alkyl- or arylsubstituent on C-4 (5a-g) were prepared in quantitative yields by reaction of2 with hydrazine.
10. Mitt.:G. Heinisch, A. Jentzsch undI. Kirchner, Tetrahedron Lett.1978, 619. 相似文献
13.
《中国化学》2017,35(10):1540-1548
An operationally convenient, asymmetric synthesis of chiral trifluoromethyl containing heterocyclic amino acids has been developed via Michael addition reaction of chiral equivalent of Ni(II)‐complex of glycine and β ‐trifluoromethylated‐α ,β ‐unsaturated ketones. The simplicity of the experimental procedures and high stereochemical outcome of the presented method render these heterocyclic amino acids readily available for systematic medicinal chemistry studies and de novo peptide design. 相似文献
14.
Peter Heiling Helmut Hönig Klaus Hummel 《Monatshefte für Chemie / Chemical Monthly》1980,111(3):575-579
Empirical force field calculations are used to interpret the occurrence of cyclopentenyl compounds in the course of metathesis degradation of partially isomerized modified poly(1-butenylenes). 相似文献
15.
Otmar Hofer 《Monatshefte für Chemie / Chemical Monthly》1979,110(3):745-753
The space close to the coordination site of1-indanone is modified systematically by placing alkyl groups of different bulkiness on C-2, C-3 and C-7, resp. The1H-LIS for the compounds are interpreted using the one site and two site model for carbonyl. Precautionary measures are discussed for both models to give reliable results in the calculation.
Herrn Prof.O. E. Polansky mit den besten Wünschen zum 60. Geburtstag gewidmet. 相似文献
16.
Pyridine, quinoline, 2,2-bipyridyl, dimethylformamide, dimethylacetamide and phthalimide combine with ZrOCl(OCHMe
2)·2Me
2CHOH to form complexes, ZrOCl(OCHMe
2)·Base [with the exception of dimethylsulfoxide: Zr2O2Cl2(OCHMe
2)2·3DMSO], whereas dialkoxides, ZrO(OR)2·ROH (R=Me, Et, Pr
i
), fail to react. The complexes have been characterized through infrared, molar conductance and thermal decomposition studies.
Komplexe von Oxozirkonium(IV)-Alkoxiden mit Sauerstoff- und Stickstoff-Basen
Zusammenfassung Pyridin, Chinolin, 2,2-Bipyridyl, Dimethylformamid, Dimethylacetamid und Phthalimid geben mit ZrOCl(OCHMe 2)·2Me 2CHOH Komplexe vom Typ ZrOCl(OCHMe 2)·Base [ausgenommenDMSO: Zr2O2Cl2(OCHMe 2)2·3DMSO], während Dialkoxide, ZrO(OR)2·ROH (R=Me, Et, Isopr), keine Reaktion ergeben. Die Komplexe wurden durch ihre IR-Spektren, molare Leitfähigkeit und mittels Untersuchung der thermischen Zersetzung charakterisiert.相似文献
17.
18.
In analogy to previous investigations on main group metal ion complexes with diacetyl2, model calculations within the LCGO MO SCF framework using minimal basis sets are used in combination with UV spectrocopy in order to investigate complex formation tendencies, eventual ion specifities and ion binding energies of Li, Na, K, Mg and Ca ions with dicarbonyl ligands. The influence of the separation of the coordinative centers by methylene groups on the interaction with these metal ions is discussed. The simple quantum chemical models seem to work in the case of diacetyl and acetylacetone, whereas they fail in the prediction of the experimentally observed interaction of acetonylacetone with the metal ions. 相似文献
19.
Hans-Dieter Martin Constanze Heller 《Monatshefte für Chemie / Chemical Monthly》1979,110(5):1271-1273
The synthesis of the two homoconjugated trienes has been achieved by cleavage of the strained -bonds of suitable cyclopropane and cyclobutane precursors. Ionization energies are discussed. 相似文献