in not given catalyzed hydroboration of CH(C6H4O2B)CH(C6H4OCH3) using RhClPPh3 and HBcat under dry N2; monitoring by NMR and GC/MAS;

[Rh(Ph2PCH2PPh2)(.eta.6-1,2-C6H4O2BO2C6H4-1,2) in tetrahydrofuran under N2, standard Schlenk techniques; soln. of (C6H4O2B)2, styrylboronate ester and Rh complex (molar ratio 1:1:0.01) in THF heated in sealed tube at 58°C for 12 h; cooled to room temp.; solvent removed in vac.; dissolved in CDCl3; product distribution detd. by (1)H NMR spectra;

Rh(dppb)(η6-catBcat) in tetrahydrofuran T=58°C; 12 h; Product distribution; Further Variations:Catalysts;