| http://www.w3.org/ns/prov#value | - The basic catalysts are organic bases, such as primary, secondary and especially tertiary amines of the formula ##STR12## in which Q.sub.1 is alkyl having 1 to 8 carbon atoms, cycloalkyl having 5 to 6 carbon atoms, benzyl orphenyl and Q.sub.2 and Q.sub.3 independently of one another are hydrogen or alkyl having 1 to 8 carbon atoms.
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