Steroids and arynes. Part II. Some reactions of arynes with steroidal dienes and trienes
Abstract
Steroid 5,7-dienes undergo the ene-reaction with benzyne and tetrachloro- and tetrafluoro-benzyen. Tetrafluoro-benzyne also forms a 5,8-adduct with a 5,7-diene and with a 5,7,9(11)-triene. Cholest-2,4-diene gives 1,4-adducts with benzyne and tetrafluorobenzyne. The pyrolyses of some adducts are discussed.