Conrotatory photochemical ring opening of alkylcyclobutenes in solution. A test of the hot ground-state mechanism

BHO Cook, WJ Leigh, R Walsh

Index: Cook; Leigh; Walsh Journal of the American Chemical Society, 2001 , vol. 123, # 22 p. 5188 - 5193

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Citation Number: 10

Abstract

Quantum yields for photochemical ring opening of six alkylcyclobutenes have been measured in hexane solution using 228-nm excitation, which selectively populates the lowest π, R (3s) excited singlet states of these molecules and has been shown previously to lead to ring opening with clean conrotatory stereochemistry. The compounds studied in this work 1, 2-dimethylcyclobutene (1), cis-and trans-1, 2, 3, 4-tetramethylcyclobutene (cis-and ...