Da-chuan Zhao, A. D. Allen, T. Tidwell
Nov 1, 1993
Citations
0
Influential Citations
27
Citations
Journal
Journal of the American Chemical Society
Abstract
2,3-Bis(trimethylsilyl)-1,3-butadiene-1,4-dione (1) is formed as the only product on thermolysis of 3,4-bis-(trimethylsilyl)cyclobut-3-ene-1,2-dione (2), and the rate of ring opening of 2 is comparable to that of substituted cyclobutenes and cyclobutenones. Photolysis of 2 also forms 1, which reacts with ethanol in a stepwise fashion with faster addition of one ethanol molecule to give an isolable monoketene 18, which reacts in a further slower step to give succinate diesters, accompanied by desilylation. 2,3-bis(tert-butyldimethylsilyl)-1,3-butadiene-1,4-dione (3), prepared analogously to 1, similarly adds one molecule of methanol to give the isolable monoketene 20, which then reacts to give dimethyl 2,3-Bis(tert-butyldimethylsilyl)succinate (21) as the major product