The term "ketal" was abandoned in the previous rules. However, because of its continued popularity, it is reintroduced in the present document as a subclass of acetals and as a functional class
term. The same applies to the cognate term "hemiketal" (see R-220.127.116.11).
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(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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