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The Crystal Structure of Axillarine Hydrobromide Ethanol Solvate: A Pyrrolizidine Alkaloid

โœ Scribed by Helen Stoeckli-Evans; David H. G. Crout

Publisher
John Wiley and Sons
Year
1976
Tongue
German
Weight
546 KB
Volume
59
Category
Article
ISSN
0018-019X

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โœฆ Synopsis

Abstract

The crystal structure of axillarine hydrobromide ethanol solvate has been determined from analysis of photographic Xโ€ray data. The crystal system is orthorhombic, space group P2~1~2~1~2~1~, with unit cell dimensions a = 9.89, b = 11.23, c = 20.83 ร…. The structure was determined by means of Patterson and Fourier syntheses, and refined by the method of leastโ€squares to an R index of 9.4%.

The structural features of axillarine are noted and compared with those of several other pyrrolizidine alkaloids. The NMR. chemical shift difference between the signals due to the nonโ€equivalent C(9) protons in alkaloids derived from retronecine is also discussed.

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