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81.
82.
Konstantin G. Nazarenko Konstantin V. Shvidenko Alexander M. Pinchuk Andrei A. Tolmachev 《Monatshefte für Chemie / Chemical Monthly》2005,31(9):211-215
The reactions of cyclic nitroenamines with isocyanates were investigated. It was found that two different products could be obtained: in inert media -carbamoyl products were observed and when a strong base was used 1,6-polymethylene-6-nitromethyl-1,3,5-triazine-2,4-dione derivatives were isolated. 相似文献
83.
I. A. Litvinov I. E. Boldeskul G. N. Koidan A. P. Marchenko A. M. Pinchuk 《Journal of Structural Chemistry》1992,33(2):314-317
Institute of Organic Chemistry, Ukrainian Academy of Sciences. Translated from Zhurnal Strukturnoi Khimii, Vol. 33, No. 2, pp. 174–177, March–April, 1992. 相似文献
84.
We consider certain pseudoconvex domains in C
n+1 and show that if the automorphism group is noncompact, then the domain is equivalent to
for some integerm ≥ 1.
Communicated by Steven Krantz 相似文献
85.
V. M. Pinchuk 《Journal of Structural Chemistry》1993,34(2):203-207
On the basis of quantum-chemical calculations in the MPNDO/3 approximation, a reaction has been proposed for the photodecomposition of water in complexes M·Chla...(H2O)2M·Chla+O2+4H++4e– (M=Mg, Mn), which suggests an interpretation of the primary event of photosynthesis. Calculations of the photosynthetic evolution of oxygen according to the Joliot-Kok model in complexes M·Chla...(H2O)2 are in good agreement with the experimental data of the thermoluninescence of chlorophyll photosystem II.Kiev Polytechnic Institute. Translated from Zhurnal Strukturnoi Khimii, Vol. 34, No. 2, pp. 33–38, March–April, 1993. 相似文献
86.
V. Ya. Zayats V. M. Pinchuk V. V. Lobanov 《Theoretical and Experimental Chemistry》1986,22(2):201-204
The distribution of the electrostatic potential of the molecule of porphine (P) and the anions formed by the successive elimination of one and two central protons from it has been studied by the SCF-MO-LCAO method in the all-valence-electron CNDO/2 approximation. The electrostatic potential of the potential of the (P-2HO2– dianion is characterized by the presence of four minima located at a distance of about 1 Å from the nitrogen atoms. The potential in them is equal to –991 kJ/mole. The value of the potential at the center of the opening is –978 kJ/mole. The distribution of the electrostatic potential of the (P-H)– anion with a fixed position of the proton near one of the nitrogen atoms is characterized by the presence of a deep valley situated at the oppositely lying nitrogen atom perpendicularly to the N-H bond. The potential of the molecule of P in the plane of the ring does not have negative values, attesting to the energetic unfavorability of the planar conformations of the (P+H)+ cation.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 22, No. 2, pp. 216–220, March–April, 1986. 相似文献
87.
88.
89.
V. V. Tereshatov A. I. Slobodinyuk M. A. Makarova Zh. A. Vnutskikh A. V. Pinchuk V. Yu. Senichev 《Russian Journal of Applied Chemistry》2016,89(6):943-948
A three-step procedure for preparing polyurethanes with mixed polyether segments was suggested. It involves preparation of the “inverse” prepolymer by the reaction of one of oligodiisocyanates with 1,4-butanediol taken in a double excess, followed by the reaction with the other oligodiisocyanate. Polyurethanes with alternating poly(tetramethylene oxide) and poly(propylene oxide) soft segments were prepared by this procedure. Such materials surpass polyurethanes prepared from a mixture of oligodiisocyanates in the strength and softening point of the hard phase. In contrast to poly(tetramethylene oxide) urethane, elastomers with mixed polyether segments do not crystallize. 相似文献
90.
Alexander M. Pinchuk Anatoly S. Merkulov Gennady V. Oshovsky Andrew A. Tolmachev 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1):713-716
C-Phosphorylation of formamidines by trivalent phosphorus halides was researched. Direction of the phosphorylation depends on nature of substituents at the amidine nitrogens. C-Phosphorylated products was shown to be of valuable possibilities to construct phosphoruscontaining heterocycles 相似文献