Starting from the hydrazone 4a we thus obtained the known bicyclic ester 5a5& and the unsaturated ester 6a, already rep~ rted,~~~~~ and in addition we also isolated isobutyronitrile, the acid 7, 9 and a trimerl0 presumed to be 8 of the Schiff's base 9.(1)(a) To whom correspondence may be addressed: Department of (b) Department of
