in diethyl ether; benzene byproducts: (C6F5)2GeBr2, (C6F5)3GeBr; GeCl4 in benzene added to etheric soln. of C6F5MgBr; driving off ether and replacing by more C6F6; refluxing for 10 h;
Pohlmann, J. L. W.; Brinckman, F. E.
Zeitschrift fuer Naturforschung, 1965 , vol. 20 b, p. 5 - 11
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Gmelin Handbook: F: PerFHalOrg.4, 3.1.3.1, page 118 - 118