The following exceptions are retained: furyl, pyridyl, piperidyl, quinolyl, isoquinolyl and thienyl (from thiophene) (see also Rule B-2.12). Also retained are furfuryl (for 2-furylmethyl), furfurylidene (for 2-furylmethylene), furfurylidyne (for 2-furylmethylidyne), thenyl (for thienylmethyl), thenylidene (for thienylmethylene) and thenylidyne (for thienylmethylidyne).
Examples to Rule B-5.11
(For further examples see Rule B-2.11.)
Indolyl from indole Pyrrolinyl from pyrroline Triazolyl from triazole Triazinyl from triazine
As exceptions, the names "piperidino" and "morpholino" are preferred to "1-piperidyl" and "4-morpholinyl".
5.12 - Bivalent radicals derived from univalent heterocyclic radicals whose names end in "-yl" by removal of one hydrogen atom from the atom with the free valence are named by adding "-idene" to the name of the corresponding univalent radical.
5.13 - Multivalent radicals derived from heterocyclic compounds by removal of two or more hydrogen atoms from different atoms in the ring are named by adding "-diyl", "-triyl", etc., to the name of the ring system.
Example to Rule B-5.12
5.21 - The use of "a" terms (Rule B-4) does not affect the formation of radical names. Such names are strictly analogous to those of the hydrocarbon analogous except that the "a" terms establish enumeration in whole or in part.
Example to Rule B-5.13
See Recommendations'93 R-2.5
Examples to Rule B-5.21
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