Acta Cryst. (2002). E58, m344-m346  [ doi:10.1107/S160053680201036X ]

Ring contraction in a dinuclear zinc(II) complex of a Robson macrocycle

W. Wongratchasee, S. Chantrapromma, H.-K. Fun, A. Usman, C. Karalai, C. Ponglimanont and K. Chantrapromma

Abstract: The [2+2] cyclocondensation reaction between sodium 2,6-diformyl-4-chlorophenolate and benzyldiethylenetriamine, using the sodium template method, followed by transmetallation with Zn(CH₃COO)₂·2H₂O, gave an unexpected 18-membered macrocyclic product in which ring contractions have occurred to produce two imidazolidine rings. In the macrocyclic complex, [-3,17-dibenzyl-13,27-dichloro-3,6,9,17,20,23-hexaazapentacyclo[23.3.1.1^11,15.0^2,6.0^16,20]triaconta-1(29),9,11(30),12,14,23,25,27-octaene-29,30-diolato]bis[(acetato-O)zinc(II)] ethanol 1.75-solvate 0.25-hydrate, [Zn₂(C₃₈H₃₈Cl₂N₆O₂)(CH₃COO)₂]·1.75C₂H₆O·0.25H₂O, each of the two Zn^II ions has a distorted trigonal bipyramidal environment.

Online 21 June 2002

Copyright © International Union of Crystallography
IUCr Webmaster