1: With NiCl2((PPh3)P)2; zinc in N,N-dimethyl-formamide T=60°C; Ullmann-pinacol coupling; 7 h; 2: With hydrogenchloride in water; N,N-dimethyl-formamide T=100°C; 2 h;
Dutt; Sen
Journal of the Chemical Society, 1923 , vol. 123, p. 3420
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Goldschmidt; Vogt; Bredig
Justus Liebigs Annalen der Chemie, 1925 , vol. 445, p. 135
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Dutt
Journal of the Chemical Society, 1925 , vol. 127, p. 2971