triphenylphosphine; [palladium(II)(bis(triphenylphosphanyl))dichloride] in toluene mixt. in toluene stirred at 50°C for 3 h; treated (H2O) at room temp.; extd. (benzene); washed with brine; dried (MgSO4); purified by chromy. on silica gel or by distn. (vac.);

1: N'-(4-tert-Butylcyclohexylidene)-4-methylbenzene-1-sulfonohydrazide With n-butyllithium; N,N,N',N,-tetramethylethylenediamine in hexane T=-78 - 20°C; Shapiro reaction; Inert atmosphere; 2: 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane in hexane T=-78 - 20°C; 4 h; Inert atmosphere;

triethylamine; (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride; triphenyl-arsane in 1,4-dioxane T=80°C; Borylation; 16 h; Title compound not separated from byproducts;

sodium periodate; ammonium acetate in water; acetone 48 h;