cesium fluoride; tris-(dibenzylideneacetone)dipalladium(0); tris-(o-tolyl)phosphine; copper(I) bromide in N,N-dimethyl-formamide T=20 - 60°C; Stille Coupling; 0.166667 h; Product distribution / selectivity;

titanium(IV) isopropylate; oxygen; 5,15,10,20-tetraphenylporphyrin in dichloromethane Irradiation (UV/VIS); Sn-compd. and porphine in CH2Cl2 cooled to -20°C, a stream of O2 passed through the soln., irrdn. with two 250-W sodium lamps for 7.5 h, addn. of Ti(O-i-Pr)4, stirred at 0°C for 15 h, addn. of ether and H2O, stirred at 20°C for 2 h; filtered, dried (MgSO4), concd., flash chromy. (silica gel, petroleum ether/ether 4:1); elem. anal., ratio erythro:threo = >95:5;