Effect of pressure on the conrotatory opening of cyclobutenes. An unexpected result?
作者:Gérard Jenner
DOI:10.1016/s0040-4020(98)83012-3
日期:1998.3
Against intuitive expectation, conrotatory opening of cyclobutenes 1-4 is slightly promoted by pressure with activation volumes around -2 to -3 cm(3).mol(-1). The volume profile shows a minimum for the transition state TS. This result together with low activation entropy values demonstrates full concertedness and suggest a cyclic TS with a preferential orbital topology. (C) 1998 Elsevier Science Ltd. All rights reserved.