e.g. Filippa Pettersson or Cancer Res. 75(6) , 1102-12, (2015) or 10.1002/anie.201600521
… for using alkoxide-accelerated vinylcyclobutane ring expansions in the synthesis of six-membered rings. Unexpected orbital symmetry allowed and forbidden 1, 3- …
T Cohen, M Bhupathy, JR Matz
Index: Cohen; Bhupathy; Matz Journal of the American Chemical Society, 1983 , vol. 105, # 3 p. 520 - 525
Abstract: A practical method for utilizing the ring expansion of 2-vinylcyclobutanols to cyclohex-3-en-l-ols, even in cases in which very acid-sensitive groups are present, consists of the addition of 1-lithio-1-methoxycyclopropanes to conjugated enals, brief treatment in the cold of the resulting alcohols with dilute acid, conversion of the resulting 2- vinylcyclobutanones to the corresponding alcohols, and treatment of the latter with ...
