The elimination of carbon monoxide from acid derivatives. Part III. Planar carbonium ions as necessary intermediates
作者:David G. Pratt、Eugene Rothstein
DOI:10.1039/j39680002548
日期:——
Elimination of carbonmonoxidefromacid chlorides by the Friedel-Crafts reaction is precluded if the resulting carboniumions are restricted to non-planar geometry by bicyclic or other structures with a rigid molecular framework. In such cases the normal ketones are obtained.
Highly diastereoselective Diels-Alder reaction of optically active ethyl 2-p-tolylsulfinylmethylenepropionate with cyclopentadiene
作者:Toru Koizumi、Ichiro Hakamada、Eiichi Yoshii
DOI:10.1016/s0040-4039(01)91155-4
日期:1984.1
Stereochemistry of the Diels-Alderreaction of ethyl Z- and E-2-ptolylsulfinylmethylenepropionate with cyclopentadiene has been studied. The high diastereoselectivity was observed especially in the case of exo-cycloaddition.