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Avicennin: hypersymmetry in space group P1

Lai, Ting Fong and Marsh, Richard E. (1974) Avicennin: hypersymmetry in space group P1. Acta crystallographica. Section B, Structural science, B30 (6). pp. 1570-1575. ISSN 0108-7681. https://resolver.caltech.edu/CaltechAUTHORS:20170317-151311629

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Abstract

Triclinic, 1i, a= 11.209 (1), b= 10.196 (2), c=9.634 (2) Å, α = 82.76 (2), β = 109.43 (1), γ = 123.61 (1)°, Z=2; C_(20)H_(20)O_4, F. W. 324.38, D_m = 1.25, D_x = 1.249 g cm^(-3). The molecular structure is found to be based on a coumarin system fused at the 5,6 positions to an α-pyran ring. The structure was solved by Patterson methods; failure of direct phasing methods can be traced to an 'aberrant phase relationship' due to the hypersymmetry of the molecule, as discussed by Thiessen & Busing [Abs. Amer. Cryst. Assoc. (1973). Storrs, Connecticut, paper N-12, p. 183].


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1107/S0567740874005280DOIArticle
http://scripts.iucr.org/cgi-bin/paper?S0567740874005280PublisherArticle
Additional Information:© 1974 International Union of Crystallography. (Received 30 January 1974; accepted 21 February 1974) This investigation was supported in part by Public Health Service Research Grant No. GM 16966, from the National Institute of General Medical Sciences, National Institutes of Health. We are grateful to Dr David Duchamp for calculating the molecular transform, to Miss Lillian Casler for preparing most of the figures, and to Miss Allison Kimball for preparing the manuscript.
Funders:
Funding AgencyGrant Number
NIHGM 16966
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Arthur Amos Noyes Laboratory of Chemical Physics4820
Issue or Number:6
Record Number:CaltechAUTHORS:20170317-151311629
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170317-151311629
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ID Code:75219
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:17 Mar 2017 22:56
Last Modified:03 Oct 2019 16:48

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