C. Didierjean, A. Aubry, M. Zouikri
Apr 15, 1995
Citations
0
Influential Citations
5
Citations
Journal
Acta Crystallographica Section C-crystal Structure Communications
Abstract
The title compound, benzyl 1-(2-benzyloxycarbonyl-1pyrazolidinylcarbonyl)pyrazolidine-2-carboxylate, C 23 H 26 N 4 O 5 , derived from the α-aza analogue of proline, crystallizes with two independent molecules per asymmetric unit, adopting two quasi mirror-image conformations. Because of steric hindrance and unfavourable polar interactions between the carbonyl groups connected to the same pyrazolidine ring, the N atoms lose part of their sp 2 character so that they are far from being planar and the N−CO bonds are noticeably longer than in peptides