Kr. Gerzevske et al., KINETIC VS THERMODYNAMIC PRODUCT DISTRIBUTIONS OF MACROCYCLIC TETRAPYRROLE CYCLIZATION PRODUCTS FROM 1,19-DISUBSTITUTED A,C-BILADIENE SALTS, Heterocycles, 37(1), 1994, pp. 207-212
Chromium(III) promoted oxidative cyclization reactions of a,c-biladien
e hydrobromides bearing bulky 1- and 19-substituents to give macrocycl
ic products are partially reversible; depending upon the reaction temp
erature, kinetic or thermodynamic products are formed and identified.