| http://www.w3.org/ns/prov#value | - Suitable basic catalysts are organic bases, such as primary, secondary and especially tertiary amines of the formula ##STR6## in which Q5 is alkyl having 1-8 C atoms, cycloalkyl having 5 or 6 C atoms, benzyl or phenyl and Q6 and Q7 independently of one another are hydrogen or alkyl having 1-8 C atoms, for example triethylamine, tri-n-butylamine, triisopentylamine, tri-n-octylamine, N,N-dimethyl-cy
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