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M. Yu. Antipin Yu. T. Struchkov V. F. Rudchenko S. M. Ignatov R. G. Kostyanovskii 《Russian Chemical Bulletin》1989,38(8):1672-1675
We have determined the molecular structure of tetramethoxyhydrazine in the crystal by x-ray diffraction analysis. The molecule is centrosymmetric with trans orientation of the unshared electron pairs of the N atoms and close to cis-cis conformations of the CONOC fragments.For previous communication, see [1].Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 8, pp. 1825–1828, August, 1989. 相似文献
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V. G. Shtamburg V. F. Rudchenko Sh. S. Nasibov I. I. Chervin A. P. Pleshkova R. G. Kostyanovskii 《Russian Chemical Bulletin》1981,30(10):1907-1913
Conclusions N-chloro-N-alkoxy-N-tert-alkylamines react exclusively with CN– and SCN– and partially with Et– and AcO– to give nucleophilic substitution products at the nitrogen atom. These compounds react with AcO– and water to give nitroso compounds, with EtS– and Ph3 P to give azoxy compounds, and with AgF and AgNO3 to give products of more complex transformations.For communication 14, see ref. [1].Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2320–2326, October, 1981. 相似文献
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V. G. Shtamburg V. F. Rudchenko Sh. S. Nasibov I. I. Chervin A. P. Pleshkova R. G. Kostyanovskii 《Russian Chemical Bulletin》1981,30(10):1914-1920
Conclusions The reactions of N-chloro-N-alkoxy-N-tert-alkylamines with amines are characterized by nucleophilic substitution at the nitrogen atom with formation of the corresponding N-alkoxyhydrazines which are stable in the case of ethyleneimine and pyridine; give diazenes as in the case of MeNH2, EtNH2, and Me2
or yield products of further transformations as in the case of NH3, Me2NH, and MeO(Me)NH. Nucleophilic substitution is repressed in the reaction with Et2NH and Et3 N by one-electron reduction with the formation of azoxy compounds.For Communication 15, see previous article [1].Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2327–2334, October, 1981. 相似文献
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G. N. Dolenko E. N. Deryagina L. P. Turchaninova V. P. Elin E. I. Basina T. O. Pavlova V. K. Voronov 《Heteroatom Chemistry》1995,6(6):623-629
Some aspects of the spatial and electronic structure of disulfides XSSX (X = H, Alk, Ph, Hal) are considered. It is shown that the growth of the geminal ns-σSX* conjugation efficiency leads to a shortening of the SS bond that is more than three times as large as the simultaneous SX bond lengthening. The positive effective charge on the sulfur atom also increases as a result of this conjugation. These effects increase with the growth of - I and + M abilities of the substituents X. The SKa line shifts and the HOMO bonding degree (Delta;nS) have been measured by the X-ray fluorescence spectroscopy method for dialkyl disulfides (Alk = Me, Et, Pr, i-Pr, Bu, i-Bu, t-Bu, C5H11, C8H17, H2NCH2CH2, CH2CH CH2, CH2Ph) and S8. With the help of ΔnS values that are proportional to the nS–σSC* conjugation efficiency, the sequence of the enhancement of the geminal conjugation efficiency has been established for the disulfides investigated. In the framework of the nS–σSS* geminal conjugations, the shortening of the SS bonds in S8 is explained. © John Wiley & Sons, Inc. 相似文献
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In X-Y-Z atomic groups of organic and organometallic molecules, the effect of a Z atom on an X atom usually does not correspond to the electronegativity and inductive effect of the Z atom (or atomic groups in substituent Z). The possible causes of this phenomenon and the nature of the effect are discussed. 相似文献
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Conclusions In the reaction of N-chloro-N-methoxy-N,N-dimethylurea with amines, a nucleophilic substitution of the chlorine atom at the N atom takes place to form N-alkoxyhydrazines, which are stable in the reaction with Me3N, pyridine, toluenesulfonamides, and give products of further transformations with Me2NH and MeONHMe.For Communication 28 see [1].Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 606–610, March, 1986. 相似文献
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Russian Journal of Organic Chemistry - The review covers the state of the art in methods of synthesis of acyclic geminal bis-peroxides, including bis-hydroperoxides, bis(1-hydroperoxyalkyl)... 相似文献