Formation of abnormal products in the aluminium chloride-catalysed ene additions of chloral and bromal to mono- and 1,2-di-alkyl ethylenes

Abstract
The title reactions afford products of apparent Friedel–Crafts acylation of the olefins by the acyl halides X2CHCOX (X = Cl or Br) as well as the expected ene adducts in many cases; the two types of products appear to be formed from a common dipolar intermediate.

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