Easy Access to Medium Rings by Entropy/Strain Reduction. V. A Simple and Mild Route to Cyclohepta‐1,3‐dienes
作者:Louise A. Byrne、Patrick J. Furlong、Declan G. Gilheany
DOI:10.1081/scc-120030751
日期:2004.12.31
The Perkin ring closure reaction of various substituted open chain cis,cis hexa-2,4-diene-1,6-dibromides with either bis(phenylsulfonyl)methane or dimethyl malonate under basic conditions gives reasonable yields of cycloheptadienes (1-7). The presence of unsaturation in the starting material ameliorates the entropy and strain problems normally encountered in such medium rings closures.