1: 82 percent / 1 percent sodium hydroxide / H2O; methanol / 4 h / Heating 2: 1.) pyridine, thionyl chloride; 2.) stannic chloride / 1.) ether, reflux, 45 min; 2.) benzene View Scheme

1: 68 percent / 1.) sodium chloride; 2.) phosphorous pentachloride / 1.) pH=neutral with sodium hydrogen carbonate, water, reflux; 2.) 170-180 deg C, 3 h 2: 85 percent / 98 percent sulfonic acid, zinc / 1.5 h; 90-100 deg C, 5 h 3: 82 percent / 1 percent sodium hydroxide / H2O; methanol / 4 h / Heating 4: 1.) pyridine, thionyl chloride; 2.) stannic chloride / 1.) ether, reflux, 45 min; 2.) benzene View Scheme

1: 85 percent / 98 percent sulfonic acid, zinc / 1.5 h; 90-100 deg C, 5 h 2: 82 percent / 1 percent sodium hydroxide / H2O; methanol / 4 h / Heating 3: 1.) pyridine, thionyl chloride; 2.) stannic chloride / 1.) ether, reflux, 45 min; 2.) benzene View Scheme

in benzene 24 h; Irradiationsev. sulfoxides of naphtho<1,2-b>- and <2,1-b>thiopyrans; var. time, temp., and solvents; Product distribution;

molybdenum(VI) sulfide; hydrogen in octane T=240°C; P=75006 Torr; 1.5 h;