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
The thermal decomposition of quaternary ammonium hydroxides. Part IV. Methohydroxides of cis- and trans-2-alkyl-NN-dimethylcyclohexylamines: evidence for elimination from a twist boat conformation.
作者:H. Booth、N. C. Franklin、G. C. Gidley
DOI:10.1039/j39680001891
日期:——
The thermaldecomposition of the methohydroxides of a number of cis- and trans-2-alkyl-NN-dimethylcyclohexylamines has been studied by quantitative analysis of the olefinic products. The methohydroxides of all the cis-bases give an olefin mixture consisting largely (91–99%) of the 1-alkylcyclohexene; the methohydroxides of all the trans-bases give an olefin mixture consisting almost entirely (94–100%)
Cu-catalyzed AAA reactions employing racemic cyclicallylic bromide and extremely reactive organolithium reagents as reaction partners have been disclosed. The corresponding alkylated products were obtained with high enantioselectivities (up to 98 % ee).