Generation of 1,2-Bisketenes from Cyclobutene-1,2-diones by Flash Photolysis and Ring Closure Kinetics<sup>1</sup><sup>a</sup>
作者:Annette D. Allen、Jim D. Colomvakos、François Diederich、Ian Egle、Xiaokuai Hao、Ronghua Liu、Janusz Lusztyk、Jihai Ma、Michael A. McAllister、Yves Rubin、Kuangsen Sung、Thomas T. Tidwell、Brian D. Wagner
DOI:10.1021/ja9722685
日期:1997.12.17
The bisketenes 2 have been generated by flash photolysis, and the kinetics of their conversion to 1 have been studied by time-resolved infrared and ultraviolet spectroscopy. The rate constants of the ringclosure of 2 are correlated by the ketene stabilization parameters (SE) and with calculated barriers. The rate constant of ringclosure of the di-tert-butyl bisketene 2g to cyclobutenedione 1g is
The regiochemical course of [2+2] cycloadditions of dichloroketene with vinyl- and alkynylsilanes
作者:Rick L. Danheiser、Howard Sard
DOI:10.1016/s0040-4039(00)81316-7
日期:1983.1
Alkynylsilanes undergo regioselective [2+2] cycloadditions with dichloroketene in good yield; the regiochemical course of these reactions is in accord with frontier molecular orbital predictions.