Ac. Gelebe et Pt. Kaye, RING-OPENING REACTIONS OF 4-ARYL-3,4-DIHYDRO-1,5-BENZODIOXEPIN-2-ONES- IMPLICATION OF LITHIUM DIISOPROPYLAMIDE IN A CANNIZZARO-TYPE TRANSFORMATION, South African Journal of Chemistry, 47(1), 1994, pp. 26-28
4-Phenyl-3,4-dihydro-1,5-benzodioxepin-2-one, on treatment with lithiu
m diisopropylamide (LDA), undergoes fission of the heterocyclic ring t
o afford catechol monocinnamate. Similar reaction in the presence of c
ertain aldehydes, however, results in double fission of the heterocycl
ic ring, yielding cinnamate esters.