Even though the trivial name isoxazole and its chalcogen analogues are retained (see R-9.1, Table 23), it is recommended that the locants 1,3- be always used with oxazole and its
chalcogen analogues to form a proper Hantzsch-Widman name.
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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