Scottish National Dictionary (1700–)
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First published 1976 (SND Vol. X, list of scientific terms with Scottish connections).
This entry has not been updated since then but may contain minor corrections and revisions.
CRUM BROWN. Chem. In phr. Crum Brown rule, a rule indicating the position which an entrant radical occupies in a benzene nucleus in regard to a radical already present.
[Enunciated in 1892 by Alexander Crum Brown (1838–1922), Professor of Chemistry at Edinburgh.]
