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As an alternative, the names "methylene", "ethylene", and "phenylene" may be used to designate

(methanediyl),

(ethane-1,2-diyl), and

(benzenediyl), respectively. The suffix "-ylene" should not be used with the mononuclear silicon, germanium, tin, or lead parent hydrides for substituent names but is allowed for the :CH2 and :SiH2 radicals (see R-5.8.1.2)

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.

Published with permission of the IUPAC by Advanced Chemistry Development, Inc., www.acdlabs.com, +1(416)368-3435 tel, +1(416)368-5596 fax. For comments or suggestions please contact [email protected]