Supplements to the 2nd Edition of Rodd's Chemistry of Carbon Compounds

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The action of Na/Hg on 1,2-dibromobenzene at 120 C gives a product originally believed to be (1) (L. Vechiotti, Ber., 1930, 63, 2275) but later (1977) shown to be the trimer (2a) (A.G. Massey, J. Organometal. Chem., 1986, 316, 25, and refs therein).