Almost the same ligands—completely different metal chelates! Compound 1, R = CO2Me, yields the Mg complex 2 (○ = Mg2+, • = NH 4+) with exohedrally bound ammonium ions by self‐organization; however, 1, R = H, affords the octanuclear Cd complex 3 (○, • = Cd2+). The ammonium ions in 2 can be fully exchanged for primary amines.

No abstract

No abstract

No abstract

Aerobic Oxygenation/Dehydrogenation of Olefins and 1,4-Dihydropyridines Catalyzed by Tris(tetraazolylenolate)iron(III) Complexes. -The olefins (I) undergo epoxidation with molecular oxygen in the presence of catalytic amounts of a metalloporphyrin analog and of isobutyraldehyde as the electron source to give the epoxides (II). Under similar conditions, the 4-substituted 1,4-dihydropyridines (III) and (V) are dehydrogenated and, eventually, dealkylated to form the pyridines (IV). -(SAALFRANK, R. W.; REIHS, S.; HUG, M.; Tetrahedron Lett. 34 (1993) 38, 6033-6036; Inst. Org.