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Die kristalline und molekulare Struktur von cis ‐Coleon D, einem cis‐A/B ‐6,7‐Diketo‐abietan‐Derivat
Author(s) -
Weber Hans Peter,
Petcher Trevor J.,
Rüedi Peter,
Eugster Conrad Hans
Publication year - 1976
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19760590424
Subject(s) - chemistry , stereochemistry , ring (chemistry) , crystal structure , moiety , crystallography , chirality (physics) , derivative (finance) , absolute configuration , acentric factor , chiral symmetry , physics , organic chemistry , quantum mechanics , financial economics , nambu–jona lasinio model , economics , quark
The Crystal and Molecular Structure of cis ‐Coleon D, a cis ‐A/B‐6,7‐Dioxo Derivative of Abietane. The X‐ray analysis of cis ‐Coleon D ( 1 ) confirmed the postulated position of HC(5) in the plane of the neighbouring keto group. This situation is unfavourable for enolisation, in contrast to the situation where the HC(5) is perpendicular to the keto plane, as supposed in trans ‐Coleon D ( 2 ). The α‐diketone moiety has a significant ( P )‐helicity of about 10 (1)°. The acentric crystal structure of cis ‐Coleon D was determined by direct methods and refined with 1533 structure amplitudes to R = 0.042. The absolute configuration was determined from the known chirality of the A / B ‐ring junction.