| http://www.w3.org/ns/prov#value | - According to the present invention the compounds of formulae (a) and (b) may be prepared by reacting an alkali metal acetylide with an aluminum halide or an aluminum compound of the general formula AIXmX' (3-m) wherein X is a hydrogen or halogen atom or an alkyl, aryl or alkoxy group, X is a halogen atom and m is 1 or 2, in the presence of an ether or an amine.
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