Bertrand's rule


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Bertrand's rule

[′ber‚tränz ‚rül]
(microbiology)
The rule stating that in those compounds, and only in those compounds, having cis secondary alcoholic groups containing at least one carbon atom ofDconfiguration which is subtended by a primary alcohol group, or having a methyl-substituted primary alcohol group ofDconfiguration, theD-carbon atom will be dehydrogenated by the vinegar bacteria Acetobacter suboxydans, yielding a ketone.