Page 1. SYNTHETIC COMMUNICATIONS, 21(22), 2263-2268 (1991) ... precursors has rccently been shown to afford ring expanded 3,4-dihydro-1,5-benzodioxepin-2- ones4 and, in this communication, we discuss :- (i) extension of the Baeyer-Villiger ... 1760 3.10 38.5 22 23 - ...