The solvolysis in acid solution of allylic halides and acetates of methylenecyclopropanes and cyclopropylmethanes does not lead to ring opening when there is an ethoxycarbonyl substituent on the ringmethylene. Only the cyclopropenyl derivative is obtained. A study of the electronic structure and the geometry of the possible allylic cation intermediate has been carried out using the MNDO method. In
Luft,R. et al., Bulletin de la Societe Chimique de France, 1971, p. 1317 - 1323
作者:Luft,R. et al.
DOI:——
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MURATA S.; SUZUKI M.; NOYORI R., J. AMER. CHEM. SOC., 1980, 102, NO 9, 3248-3249
作者:MURATA S.、 SUZUKI M.、 NOYORI R.
DOI:——
日期:——
1,3-O- to -C-alkyl migration of 1-alkenyl alkyl acetals and ketals catalyzed by boron trifluoride. Selective cross- and regioselective aldol type reactions
1,3-Alkyl migration of 1-alkenyl alkyl acetals and ketals is effectively catalyzed by trifluoroborane etherate to give cross aldol type products selectively. Remarkable regio-selectivity is observed in the synthesis of α-alkyl-β-alkoxy-ketones.