Note: For indexing purposes, this method is used in Beilstein for esters, acyl halides, amides, hydrazides, lactones, lactams and nitrogen derivatives of carbonyl compounds (oximes, hydrazones, etc.). For indexing purposes, this method is also used in Chemical Abstracts index nomenclature for anhydrides, esters, hydrazides, hydrazones and oximes.
Note: The use, in this section and elsewhere in this guide, of systematic names, such as propanal and propanoic acid, rather than retained names (see R-9.1), such as propionaldehyde and propionic acid, illustrates that, even though some names are retained, this does not preclude use of the systematic names.
Examples to R-3.2.2
Propanal dimethyl acetal
Propionic acid methyl ester
Propionic acid hydrazide
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