Absolute configuration of the (+)-calamenenes: crystal structure of 7-hydroxycalamenene

1 January 1978

journal article
research article
Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 1

No. 10,p. 1267-1270
https://doi.org/10.1039/p19780001267

Abstract

The sesquiterpenes 7-hydroxycalamenene and (+)-calamenene isolated from Eremophila drummondii have been interrelated. The crystal structure and absolute configuration of the p-bromobenzoate of 7-hydroxycalamenene, C₂₂H₂₅BrO₂, has been determined; crystals are orthorhombic, space group P2₁2₁2₁, unit cell dimensions a= 9.471(5), b= 11.469(5), c= 18.253(7)Å, for Z= 4. These results show that both sesquiterpenes have the (1R,4R)-configurations and resolve the present confusion on this point.

Keywords

CRYSTAL STRUCTURE

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