Katalytische Cyclisierung von Acetylen und substituiertem Acetylen zu aromatischen Kohlenwasserstoffen

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Abstract
The pentahalogenides of niobium and tantalum and some tungsten chlorides catalize the cyclotrimerization of acetylenic hydrocarbons to form aromatic compounds. Acetylene is converted into benzene at atmospheric pressure and temperatures between — 20 and 130°C. Under similar conditions methylacetylene and but‐1‐yne respectively yield a mixture of the corresponding 1,2,4‐ and 1,3,5‐substituted benzenes while with but‐2‐yne hexamethyl benzene is obtained. Cocyclization between acetylene and substituted acetylenes or diacetylene is possible; in this case mono‐ and disubstituted benzenes or biphenyl, terphenyl, and polyphenyls are formed.

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