A macrocyclic compound that has two salenH(2) moieties was synthesised via
recombination of an acyclic Schiff base in quite high yield, and was charac
terized by X-ray crystallography. The recombination occurred in a slow diff
usion system of chloroform-methanol, where the starting material may sponta
neously form a molecular assembly suitable for the subsequent reaction. Thi
s assumption was supported by the crystal structure of an analogue of the a
cyclic Schiff base. (C) 2001 Elsevier Science Ltd. All rights reserved.