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.
I. F. Eckhard, H. Heaney and B. A. Marples, J. Chem. Soc. C, 1969, 2098 DOI: 10.1039/J39690002098
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