EFFECT OF A-STRAIN. DIASTEREOSELECTIVE SYNTHESIS OF 3,2′-METHYLENE BRIDGEDCIS-4a-ARYLDECAHYDROISOQUINOLINE RING SYSTEM VIAN-ACYLIMINIUM ION-POLYENE RING CLOSURE
EFFECT OF A-STRAIN. DIASTEREOSELECTIVE SYNTHESIS OF 3,2′-METHYLENE BRIDGEDCIS-4a-ARYLDECAHYDROISOQUINOLINE RING SYSTEM VIAN-ACYLIMINIUM ION-POLYENE RING CLOSURE