Reactions of the Lithium Salts of the Tribenzylidenemethane Dianion, Diphenylacetone Dianion, and Related Compounds
摘要:
Potentially synthetically useful reactions of the dilithium salts of the title dianions have been investigated, Electrophilic quenching with a variety of reagents usually leads to the expected products in good yield. Quenching the diphenylacetone dianion with 1 equiv of trimethylchlorosilane, however, gives a good yield of 1,3-diphenylallene obtained by formal elimination of a trimethylsiloxy anion from an intermediate monoquenched monoanion salt. NMR studies, however, do not reveal the intermediacy of the 1,3-diphenyl-2-(trimethylsiloxy)allyl anion but rather suggest that the initial reaction site is at carbon, rather than oxygen, Oxidation of the dianions leads either to ring closure or dimerization for the tribenzylidenemethane dianion and to dimerization for the diphenylacetone dianion. The dimerization reactions are stereospecific, both with respect to the two new stereocenters produced and for the double bonds of the bis-silyl enol ether products if the dimeric bis-enolate dianion products are quenched with trimethylchlorosilane.
Photochemistry of 2-phenyl-1,2-dihydronaphthalene. A competition between a singlet state di-.pi.-methane rearrangement and a ring-opening reaction
作者:Joseph J. M. Lamberts、Wim H. Laarhoven
DOI:10.1021/ja00318a031
日期:1984.3
Formation par irradiation a 300 nm dans l'hexane des endo- et exo-phenyl-6 bicyclo [3.1.0] hexenes-2 et du dihydro-7,12 dibenzo [a,d] cyclooctatetraene. Mecanisme de transposition di-π-methane
形成对位辐照 300 nm dans l'己烷 des 内-和外-苯基-6 双环 [3.1.0] 己烯-2 和 du dihydro-7,12 二苯并 [a,d] 环辛四烯。二-π-甲烷转位机制
Thermochemistry of phenyl-substituted benzobicyclo[3.1.0]hex-2-enes. Evidence for carbenes as intermediates
作者:Joseph J. M. Lamberts、Wim H. Laarhoven
DOI:10.1021/jo00175a020
日期:1984.1
Cuppen, Th. J. H. M.; Berendsen, N.; Laarhoven, W. H., Recueil des Travaux Chimiques des Pays-Bas, 1990, vol. 109, # 3, p. 168 - 171
作者:Cuppen, Th. J. H. M.、Berendsen, N.、Laarhoven, W. H.
DOI:——
日期:——
LAMBERTS, J. J. M.;LAARHOVEN, W. H., J. ORG. CHEM., 1983, 48, N 13, 2202-2206
作者:LAMBERTS, J. J. M.、LAARHOVEN, W. H.
DOI:——
日期:——
LAMBERTS, J. J. M.;LAARHOVEN, W. H., J. ORG. CHEM., 1984, 49, N 1, 100-106