PRACTICAL METHOD FOR USING ALKOXIDE-ACCELERATED VINYLCYCLOBUTANE RING EXPANSIONS IN THE SYNTHESIS OF SIX-MEMBERED RINGS. UNEXPECTED ORBITAL SYMMETRY ALLOWED AND FORBIDDEN 1,3-SIGMATROPIC REARRANGEMENTS.

Article abstract of DOI:10.1021/ja00341a035

A practical method for utilizing the ring expansion of 2-vinylcyclobutanols to cyclohex-3-en-1-ols, even in cases in which very acid-sensitive groups are present, consists of the addition of 1-lithio- 1-methoxycyclopropanes to conjucated enals, brief trea