The reactions of several gem- and vic-polychloroethanes containing 3–5 Cl atoms with PhONa in dimethyl sulfoxide and with PhSNa in N,N-dimethylformamide were examined. Either the mono-, di-, or tetra-substituted compounds of polychloroethylenes were obtained as the main products, depending on the kinds of substrates as well as on the amounts of the bases. The reaction products from polychloroethylenes
Kinetics of alkylhalocarbene rearrangements: modulation by fluorine substituents
作者:Robert A. Moss、Guo Jie Ho、Weiguo Liu
DOI:10.1021/ja00029a025
日期:1992.1
Rate constants were measured by laser flash photolytic methods for hydrogen and carbon 1,2-migrations in four different alkylchlorocarbenes and in the analogous alkylfluorocarbenes. The carbenes, products, and rate constants (s-1) were as follows: phenoxymethylchlorocarbene to (Z)- and (E)-1-chloro-2-phenoxyethene (Z/E approximately 4/1), k = 3.6 x 10(7); phenoxymethylfluorocarbene to (Z)-1-fluoro-2-phenoxyethene (Z/E > 10/1), k = 1.3 x 10(7); neopentylchlorocarbene to (Z)- and (E)-1-tert-butyl-2-chloroethene (Z/E = 1/12), k = 1.4 x 10(7); neopentylfluorocarbene to (Z)- and (E)-1-tert-butyl-2-fluoroethene (Z/E = 1/2.5), k = 2.6 X 10(6); cyclobutylchlorocarbene to 1-chlorocyclopentene (C migration) and chloromethylenecyclobutane (H migration), k(c) = 4.6 X 10(7), k(H) = 2.1 X 10(7); cyclobutylfluorocarbene to 1-fluorocyclopentene (C migration) and fluoromethylenecyclobutane (H migration), k(c) = 1.8 x 10(6), k(H) = 5.3 x 10(5); cyclopropylchlorocarbene to 1-chlorocyclobutene, k = 9 x 10(5); cyclopropylfluorocarbene to 1-fluorocyclobutene, k = 1.4 x 10(5). Activation energies for several of these processes were in the range of 2-4 kcal/mol, with A approximately 10(8)-10(9) s-1.
Aisa, A. M. Ahmed; Heinemann, Frank W.; Steinborn, Dirk, Zeitschrift fur Anorganische und Allgemeine Chemie, 1996, vol. 622, # 11, p. 1946 - 1952
作者:Aisa, A. M. Ahmed、Heinemann, Frank W.、Steinborn, Dirk
DOI:——
日期:——
Activation energy for a 1,2-hydrogen shift in (phenoxymethyl)chlorocarbene
作者:John E. Chateauneuf、Michael T. H. Liu
DOI:10.1021/jo00020a043
日期:1991.9
SHOSTAKOVSKIJ, M. F.;MOCHALOV, V. N.;FILIPPOV, O. F.;SHOSTAKOVSKIJ, S. M., IZV. AN CCCP. CEP. XIM., 1985, N 1, 222-224
作者:SHOSTAKOVSKIJ, M. F.、MOCHALOV, V. N.、FILIPPOV, O. F.、SHOSTAKOVSKIJ, S. M.