in pyridine refluxing mixt. of tin compd. and porphyrin deriv. in pyridine at 115°C for 2 h; evapn., extn. (CHCl3), washing with aq. HCl, drying with Na2SO4, evapn.,recrystn. (CHCl3/cyclohexane), elem. anal.;

tin(ll) chloride in ethanol; chloroform 12 h; Reflux;