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A.Kh. Khusid G.V. Kryshtal V.A. Dombrovsky V.F. Kucherov L.A. Yanovskaya V.I. Kadentsev O.S. Chizhov 《Tetrahedron》1977,33(1):77-84
α,β-Unsaturated aldehyde acetals add :CCl2 (obtained in accordance with Makosza procedure) to form gem-dichlorocyclopropanecarboxaldehyde acetals (1) in high yields when the ratio of reactants is no less than 1:4. The addition of :CCl2 to polyunsaturated aldehyde acetals in the above conditions proceeds regioselectively at double bonds enriched by electrons. Compounds 1 are reduced by sodium in liquid ammonia to give cyclopropanecarboxaldehyde acetals (2). Both 1 and 2 are hydrolized by dilute H3P04 to the corresponding aldehydes and are added to vinyl ethers in the presence of BF3·Et2O to produce only 1:1 adducts which are hydrolyzed by a mixture of AcOH-AcONa-H2O to give β-formylcyclopropanes which were previously unknown. 相似文献
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Khusid B Acrivos A 《Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics》1999,60(3):3015-3035
To develop a theory for electric-field-driven phase transitions in concentrated suspensions, we extended our microscopic theory [Phys. Rev. E 52, 1669, (1995); 54, 5428, (1996)] beyond the dilute regime. Based on the model of the Maxwell-Wagner interfacial polarization of colloids, our theory overcomes the limitations of Brillouin's formula for the electric energy of conducting materials which is applicable only for negligibly small energy dissipation and slow time variations of the field. We found that the phase diagrams of "the particle concentration vs the electric field strength" for colloids are similar to the phase diagrams for the first-order phase separation in quenched conventional binary systems with a high-temperature miscibility gap. This explains why a variety of colloids exhibit similar field-induced aggregation patterns. Our theory provides a reasonable interpretation of the available experimental data on field-induced aggregation phenomena in electrorheological fluids and aqueous suspensions, whereas currently used theoretical models are in variance with many of the data. The theoretical results enable one to trace how the variations of the electrical properties of the constituent materials influence the topology of the suspension phase diagram and to evaluate the effects of the field strength and frequency on the particle aggregation. 相似文献
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A. Kh. Khusid V. I. Kadentsev G. V. Kryshtal' O. S. Chizhov L. A. Yanovskaya 《Russian Chemical Bulletin》1977,26(3):557-560
Conclusions Diazomethane adds to the acetals of crotonaldehyde and glutaconic dialdehyde in a regioselective manner, forming a mixture of both possible 1-pyrazolines.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 620–623, March, 1977. 相似文献
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G. V. Kryshtal A. Kh. Khusid V. F. Kucherov L. A. Yanovskaya 《Russian Chemical Bulletin》1977,26(3):646-648
Conclusions Depanding on thre ratio of the reactant, cital diethyl acetal reacts with dichlorocarbene at either the terminal or both double bonds.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 709–711, March, 1977. 相似文献
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