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Some stability and stereochemical considerations of simple Bicyclo[4.2.0]octanols

Loughlin, W.A., Rowen, C.C.ORCID: 0000-0003-4490-9542 and McCleary, M.A. (2005) Some stability and stereochemical considerations of simple Bicyclo[4.2.0]octanols. Australian Journal of Chemistry, 58 (5). pp. 354-361.

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Bicyclooctanols 3 and 4 were formed with control of the stereochemistry at C8 by using an aluminium enolate of cyclohexanone in 1,2-dimethoxyethane. Bicyclooctanols 1 and 3 were stable towards aqueous hydrochloric acid for short times (< 3.5 h), and ring open to a diastereomeric mix of monoalkylated 5 under protic or aprotic conditions in the presence of base (NaOH or lithium diisopropylamide). The rate of ring opening appears to be dependent on reaction temperature. Bicyclooctanols 1, 3, and 4 displayed remarkable stability when heated at reflux in benzene, whereas use of ethanol prompted stereoselective ring opening of 1 and 3 to give individual diastereomers of monoalkylated 5 and ring opening of 4 to give a 50 : 50 mix of diastereomers of 5. This unexpected result was attributed to the stereochemistry of the bicyclooctanol and placement of hydrogen-bonding sites.

Item Type: Journal Article
Publisher: Commonwealth Scientific and Industrial Research Organization Publishing
Copyright: © 2005 CSIRO
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