B. Blanco et al., Preparation of nitrogen-containing 20-membered tetraolefinic macrocycles: (E,E,E,E)-1,6,11,16-tetra(arylsulfonyl)-1,6,11,16-tetraaza-cycloicosa-3,8,13,18-tetraenes, TETRAHEDR L, 42(51), 2001, pp. 9001-9003
Arenesulfonamides and trans-1,4-dibromobut-2-ene are the ultimate precursor
s for the stepwise preparation of the 20-membered macrocycles of the title.
(C) 2001 Published by Elsevier Science Ltd.