are obtained by reaction of AlH3 with pyrrolidine enamines of acyclic and cyclic ketones. Enamines of α-substituted cyclohexanones are converted to 3-alkylcyclohexenes. Those derived from disubstituted acetaldehydes are only poorly hydrogenolysed as is the dienamine derived from Δ1,9-octalone. 1-N-Pyrrolidinocyclo-octene is unique in giving cyclo-octane in the hydrogenolysis reaction; trans-cyclo-octene
Hueckel,W.; Kraus,W., Justus Liebigs Annalen der Chemie, 1962, vol. 654, p. 49 - 63
作者:Hueckel,W.、Kraus,W.
DOI:——
日期:——
Thermal isomerization of a vinylcyclobutene to a cyclohexadiene
作者:Gitendra C. Paul、Joseph J. Gajewski
DOI:10.1021/jo00033a014
日期:1992.3
Above 100-degrees-C 5-methylenespiro[3.5]non-1-ene, 1, undergoes cyclobutene ring opening to (E)-triene 2 and apparent 1,3-shift to a hexahydronaphthalene, 3, in a 3 to 1 ratio. (E)-Triene 2 gives 3 in a competitive reaction. The activation energies for all three processes are obtained from a kinetic simulation at three temperatures. It is likely that the (Z)-triene 4, also derived by cyclobutene ring opening, is an intermediate in the 1 to 3 conversion. Speculation on the 2 to 3 conversion focuses on the possible intermediacy of a 3-vinylcyclohexenocyclobutene, 5. The apparent noninvolvement of a concerted 1,3-shift in the 1 to 3 reaction is discussed.
Photochemistry of cyclopentenones: tricyclo[4.3.2.0]undecenones and tricyclo[3.3.3.0]undecenones
作者:Robert L. Cargill、Norton P. Peet、David M. Pond、William A. Bundy、A. Bradford Sears
DOI:10.1021/jo01308a010
日期:1980.9
(2-Vinylcyclopropyl)carbenes. More Stepwise Mechanisms for Ring-Expansion
作者:Jordan M. Cummins、Istvàn Pelczer、Maitland Jones
DOI:10.1021/ja991254r
日期:1999.8.1
A simple vinyl group is sufficient to induce a stepwise mechanism for the ring expansion of cyclopropylcarbenes.