in acetic acid heating of tetra4-methoxy-phenyl)-prophine and Co(II)-acetate in acetic acid;; chromatographic purification with CHCl3 as solvent; recrystallisation in a CHCl3-CH3OH-mixture;;

in N,N-dimethyl-formamide T=110°C; 1 h; Inert atmosphere;

in acetic acid porphyrin was added to boiling soln. of acetate in acetic acid, mixt. was boiled for 0.5 h and kept at room temp. for 12 h; ppt. was filtered, washed with hot water, dried in air at 70°C, chromd. (silica gel, chloroform), recrystd. from chloroform-hexane mixt.;

1: propionic acid / 2.25 h / 140 °C / |Inert atmosphere 2: N,N-dimethyl-formamide / 1 h / 110 °C / |Inert atmosphere View Scheme

in N,N-dimethyl-formamide two step procedure: absorbing of metal chloride on RB-carbon carrier followed by reaction with porphin;

in propionic acid in situ synthesis on RB-carbon support;