in pyridine Heating under stirring (115°C, N2, 25 min).; Cooling, evapn. to dryness (vacuum), washed (ether, petrol), dried, extraction with acetone, filtn. of TlCl, evapn. to dryness, washed (cold ethanol), recrystn. (acetone/light petroleum, washed (ether/ethanol), elem. anal.;

in pyridine Heating under stirring (115°C, N2, 25 min).; Cooling, evapn. to dryness (vacuum), washed (ether, petrol), dried, extraction with acetone, filtn. of TlCl, evapn. to dryness, washed (cold ethanol), recrystn. (acetone/light petroleum, washed (ether/ethanol), elem. anal.;

in pyridine Heating under stirring (110-115°C, N2, 15 min).; Cooling, evapn. to dryness (vacuum), washed (light petroleum), dried, extn. with Me2CO, filtn. of TlI, evapn. to dryness, washed (cold EtOH), recrystn. (pyridine/water and acetone/ light petroleum), elem. anal.;

in pyridine Heating under stirring (110°C, N2, 20 min).; Cooling, evapn. to dryness (vacuum), washed (light petroleum), dried, extn. with Me2CO, filtn. of TlCl, evapn. to dryness, washed (cold EtOH), recrystn. (acetone/light petroleum), cooling to -28°C, elem. anal.;

in pyridine Heating under stirring (110-115°C, N2, 17 min).; Cooling, evapn. to dryness (vacuum), washed (light petroleum), dried, extn. with Me2CO, filtn. of TlI, evapn. to dryness, washed (cold EtOH), recrystn. (acetone/light petroleum, pyridine/H2O and ether/light petroleum), elem. anal.;

in pyridine Heating under stirring (115°C, N2, 25 min).; Cooling, evapn. to dryness (vacuum), washed (ether, petrol), dried, extraction with acetone, filtn. of TlCl, evapn. to dryness, washed (cold ethanol), recrystn. (acetone/light petroleum, washed (ether/ethanol), elem. anal.;