different between butyl vs butyldimethylsilyl

English

butane +? -yl

butyl (plural butyls)

(organic chemistry) Any of four isomeric univalent hydrocarbon radicals, C₄H₉, formally derived from butane by the loss of a hydrogen atom.
A synthetic rubber made by the polymerization of isobutylene.

From but- +? -yl.

butyl n (uncountable)

butyl +? dimethyl +? silyl

butyldimethylsilyl (plural butyldimethylsilyls)

(organic chemistry, especially in combination) The univalent silyl radical containing one butyl and two methyl grups

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