Regioselectivity of pyridine ring migration during triplet-sensitized di-.pi.-methane photorearrangements of 5,8-dihydro-5,8-methanoisoquinoline derivatives. The case for heteroatom control
Neighboring group participation by a pyridine ring. 2. Effects of aromatic substituents on solvolysis of 5,8-methano-5,6,7,8-tetrahydroisoquinoline and benzonorbornene derivatives