Z-AZPRO-AZPRO-OBZL

Authors
DIDIERJEAN C AUBRY A ZOUIKRI M BOUSSARD G MARRAUD M
Citation
C. Didierjean et al., Z-AZPRO-AZPRO-OBZL, Acta crystallographica. Section C, Crystal structure communications, 51, 1995, pp. 688-690
Citations number
10
Categorie Soggetti
Crystallography
Journal title
Acta crystallographica. Section C, Crystal structure communications → ACNP
ISSN journal
01082701
Volume
51
Year of publication
1995
Part
4
Pages
688 - 690
Database
ISI
SICI code
0108-2701(1995)51:<688:Z>2.0.ZU;2-J
Abstract
The title compound, benzyl -pyrazolidinylcarbonyl)pyrazolidine-2-carbo xylate, C23H26N4O5, derived from the alpha-aza analogue of proline, cr ystallizes with two independent molecules per asymmetric unit, adoptin g two quasi mirror-image conformations. Because of steric hindrance an d unfavourable polar interactions between the carbonyl groups connecte d 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 ar e noticeably longer than in peptides.