Zobrazeno 1 - 10
of 19
pro vyhledávání: '"M. A. Shokhen"'
Publikováno v:
ChemInform. 21
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c2212b7fb593418d98e1f376037984d1
https://doi.org/10.1002/chin.199018179
https://doi.org/10.1002/chin.199018179
Publikováno v:
Chemistry of Heterocyclic Compounds. 25:1056-1059
Proton affinity of furazane, furoxane, and their aminoderivatives for protonation at various centers was calculated by ab initio methods using the STO-3G basis set. Basicity was found to decrease in the following order: N-oxide oxygen atom, endocycli
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cf480f9d766503cc91ff3bb17fce1d50
https://doi.org/10.1007/bf00487310
https://doi.org/10.1007/bf00487310
Publikováno v:
Chemistry of Heterocyclic Compounds. 25:884-888
The geometries, conformations, and electron structures of the methyl esters of dimethylamino- and (1-aziridino)propiolic acid were studied by means of the MNDO method. It was shown that the energies of the lowest vacant molecular orbital may serve as
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9a3148af52b59c1c142bab6e95ae1f19
https://doi.org/10.1007/bf00479606
https://doi.org/10.1007/bf00479606
Publikováno v:
Chemistry of Heterocyclic Compounds. 23:143-146
The proton affinities of a series of aminofurans and their aza derivatives were calculated by a nonempirical method in the STO-3G basis set. A correlation was established between the proton affinities and the position of the heteroatoms in the ring.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9bc8854949f6bed60d5a520a525d1997
https://doi.org/10.1007/bf00663849
https://doi.org/10.1007/bf00663849
Publikováno v:
Bulletin of the Academy of Sciences of the USSR Division of Chemical Science. 34:317-320
The dependence of the nucleophilicity of methoxyamines and fluoroamines on the number of heteroatomic substituents is a function of the electron-withdrawing properties of theα-heteroatoms which are manifest in opposite effects: On one hand, the stab
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::570378edb112249d61d6613fb61e2ca9
https://doi.org/10.1007/bf00951277
https://doi.org/10.1007/bf00951277
Autor:
M. A. Shokhen, G. V. Shustov, R. G. Kostyanovskii, Anton V. Eremeev, F. D. Polyak, R. K. Alekperov, I. A. Vosekalna, G. K. Kadorkina
Publikováno v:
Chemistry of Heterocyclic Compounds. 25:32-39
The optically active 1-acyl-substituted (1R,2R)-2-methyl- and (1R,2S)-2-methoxycarbonylaziridines were synthesized. The nonplanarity of the amide chromophore in them and its high conformational mobility, which was caused by the rotation around the N-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b70ef85b2241a957804027278449c737
https://doi.org/10.1007/bf00472614
https://doi.org/10.1007/bf00472614
Publikováno v:
Chemistry of Heterocyclic Compounds. 23:44-48
The proton affinities (PA) of 16 aminoazoles were calculated by the MNDO and ab initio methods. It was assumed that the effect of the heteroatom on the PA is determined by its type and position and does not depend on the presence of other heteroatoms
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f3338361de39d13ef678092757f85a22
https://doi.org/10.1007/bf00475472
https://doi.org/10.1007/bf00475472
Asymmetric nitrogen 60. Acylation as a pathway to optically active 1,3,3-trisubstituted diaziridines
Publikováno v:
Bulletin of the Academy of Sciences of the USSR Division of Chemical Science. 37:1665-1671
1. The acylation of 1,3,3-trisubstituted diaziridines with acyl chlorides is realized primarily at the substituted N1 atom and is accompanied by diaziridine-hydrazone rearrangement. 2. Acylation with a 0.5-mole amount of (S)-N-tosylproline chloride i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a4eb81e2f0d2a04cbc7daf561e5dce5a
https://doi.org/10.1007/bf00961119
https://doi.org/10.1007/bf00961119
Publikováno v:
Chemistry of Heterocyclic Compounds. 22:214-217
The overall energy of isomers of substituted furoxans has been calculated using the MINDO/3 method. Comparison with experimental results indicated that the calculation correctly predicted the structure of the more stable isomer. Correlation of the di
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e8dc4ee9daf4e149dcc3b2563a86a490
https://doi.org/10.1007/bf00519947
https://doi.org/10.1007/bf00519947
Publikováno v:
Chemistry of Heterocyclic Compounds. 25:1021-1023
Proton affinity of the amino groups of 10 N-aminoazoles is calculated using the STO-3G basis set. The nature of the heterocyclic effect on proton affinity of the amino groups depends on its conformation which in turn is determined by the number of ni
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bed03919a7bcf96c8e3ae42aa4629c34
https://doi.org/10.1007/bf00487301
https://doi.org/10.1007/bf00487301