The letters "s-", "t-", and "i-" used as prefixes with the abbreviation Bu (for butil) ["i"-also with Pr (for propyl], can be found in many publications (e.g. s-Bu, i-Pr), but they are not recommended for use in names.

This HTML reproduction is as close as possible to the published version [see IUPAC, Commission on Nomenclature of Organic Chemistry. A Guide to IUPAC Nomenclature of Organic Compounds (Recommendations 1993), 1993, Blackwell Scientific publications, Copyright 1993 IUPAC]. If you need to cite these rules please quote this reference as their source.

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