N-benzyl-trimethylammonium hydroxide; 2,3,5-triphenyl-2H-tetrazolium chloride in dichloromethane

ammonium hydroxide; copper diacetate; sodium hydride 1.) 0 - 100 deg C, 15 - 20 min, 2.) THF, 2 h; Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;

Novozyme 435TM in ethanol T=20°C; 32 h;