The Stereochemistry of Five- and Six-Membered Chelate Rings— Stereochemical Analysis of a Macrocyclic Complex Containing Six Asymmetric Centers

The two sets of isomers, Ni(1,4-CTH)2 + (5,7,7,12,12,14-hexamethyl-1,4,8,1 l-tetraazacyclotetradecanenickel(II), Structure (I) and Ni(l,7-CTH)2 + (5,5,7,12,12,14-hexamethyl-1,4,8,11 -tetraazacyclotetradecanenickel(II), Structure (II), are distinguishable primarily on the basis of methyl group positions.