非対称ポリメチルビフェニルとポリクロロポリメチルビフェニルの合成

抄録

Pentachlorophenylmagnesium chloride and pentamethylphenylmagnesium iodide, prepared in tetrahydrofuran solutions from hexachlorobenzene and pentamethyliodobenzene, respectively, were treated with opper( 1 ) iodide below 0°C. A given polymethyliodobenzene was then added to the resulting dark solution and the mixture was heated under gentle reflux for 6 to 8 hr. Removal of the solvent followed by the Soxlhet extraction of the residue and chromatography on activated alumina gave the corresponding unsymmetrical biphenyl in fair to good yields.
Biphenyls thus obtained include 2, 3, 4, 5, 6-pentachloro-2', 3', 4', 5', 6'-pentamethylbiphenyl; 2, 3, 4, 5, 6-Pentachloro-2', 3', 4', 5'-tetramethylbiphenyl; 2, 3, 4, 5, 6-pentachloro-2', 3', 4', 6'-tetra, T: methylbiphenyl; 2, 3, _4, 5, 6-pentachloro-2', 3', 5', 6'-tetrarnethylbiphenyl; 2, 3, 4, 5, 6-pentachloro 2', 4', 6'-trimethylbiphenyl; 2, 3, 4, 5, 6--pentachlorobiphenyl; 2, 2', 3, 3', 4, 5, 5', 6, 6'-nonamethyl biphenyl; and 2, 2', 3, 4, 4', 5, 6, 6'-octamethylbiphenyl,