PROCESS FOR PRODUCING 5,5′-BIACENAPHTHENYL Russian patent published in 1996 - IPC

FIELD: semiproducts in the production of thermally stable polymers and dispersive vat dyes. SUBSTANCE: 5,5′- biacenaphthenyl is prepared by reductive combination of 5-chloro (bromo, iodo) acenaphthene with zinc powder or magnesium chips in the presence of catalytic amounts of nickel chloride, bromide or iodide, nitrogen-containing ligand such as 2,2′-bipyridyl or 1,10-phenanthropine and promoter in dimethyl formamide at 60-150 C. The process affords safety and 96 % conversion. EFFECT: more efficient preparation process. 5 tbl