The stereochemistry of the cyclisation of several 1,4- and 1,5-dibromides (and one 1,5-toluene-p-sulphonate) with unsymmetrical acyclic bases NHMeR1 has been investigated. Usually (but not invariably) the mixture of diastereomeric quaternary salts is formed with quite low stereoselectivity, the more stable isomer predominating.
D. R. Brown, J. McKenna and J. M. McKenna, J. Chem. Soc. B, 1969, 567 DOI: 10.1039/J29690000567
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