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Compounds Containing a N-CO-N or Related Group

Urea and Its Derivatives Rule C-974

974.1 - Compounds formed from urea, isourea, or their derivatives by replacement of oxygen by sulfur, selenium, or tellurium are named by attaching a prefix "thio-", "seleno-", or "telluro-", respectively, directly before urea, ureido-, ureylene-, or uronium. Locants are used in the same way as for urea and its derivatives; when necessary, a locant S, Se, or Te is used to assign substituents to these atoms.

Examples to Rule C-974.1


Thiourea


N-Methylselenourea
or 1-Methyl-2-selenourea


1-Methyl-2-propylisothiourea


3-Methyl-2-propylisothiourea

When a choice between the two preceding structures cannot be made, the name is: N-Methyl-S-propylisothiourea.

For the above mesomeric cation the name is:

N,N-Diethyl-S-phenylthiouronium

See Recommendations'93 Table 31(a)

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Compounds Containing a N-CO-N or Related Group C-975
Compounds Containing a N-CO-N-N or More Complex Group C-981, C-982, C-983, C-984, C-985
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This HTML reproduction of Sections A, B and C of IUPAC "Blue Book" is as close as possible to the published version [see Nomenclature of Organic Chemistry, Sections A, B, C, D, E, F, and H, Pergamon Press, Oxford, 1979. Copyright 1979 IUPAC.] If you need to cite these rules please quote this reference as their source.

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