alpha-chloronaphthalene in water; acetone; toluene T=70 - 240°C; 10 h;

ammonium molybdate in further solvent(s) prepn. according to D. Guay et al., J. Electrochem. Soc. 136 (1989) 2272at 220°C in 1,2,4-trichlorobenzene; purified by vac. gradient sublimation at residual pressure of 1E-4 Torr;

in neat (no solvent) refluxing (1 h), cooling (0°C); ppt. washed (benzene, CCl4, acetone), dried (vac., 110°C); elem.anal.;

NH4OH in pyridine refluxing (24 h); filtn., washing (0.1 M HCl, methanol), drying (oven);