tetrabutylammomium bromide; potassium carbonate; palladium diacetate in N,N-dimethyl-formamide T=105 - 110°C; 72 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;
Barclay,L.R.C. et al.
Canadian Journal of Chemistry, 1961 , vol. 39, p. 870 - 880
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Barclay; Gray
Chemistry and Industry (London, United Kingdom), 1959 , p. 1350