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in hexane; sulfuric acid solvents cooling to 0°C, acetonitrile and then B-compd. slow addn., stirring (0°C, 5 h), mixture pouring to crushed ice; resulting soln. extracting with chloroform, B-compd. isolation from chloroform extract by evapn., organic product obtaining from aq. layer;

potassium phosphate; (1,2,3,4,5-pentaphenylferrocen-1'-yl)-di-tert-butylphosphine; bis(dibenzylideneacetone)-palladium(0) in toluene T=100°C; 22 h;

in hexane byproducts: water; water azeotrope was distilled from a hexane soln. of the boronic acid and HOCH2CH2OH, water was collected in a Dean-Stark trap; residual ethylene glycol was removed by treatment with anhyd. CaCl2, the ester was distilled under reduced pressure; elem. anal.;