sulfur; phenylhydrazine in N,N-dimethyl-formamide T=20 - 25°C; 24 h;

lithium aluminium tetrahydride in tetrahydrofuran 0.25 h;

Multi-step reaction with 2 steps 1: 85 percent / LiAlH4 / tetrahydrofuran / 0.25 h2: lithium tetramethylpiperidide (LTMP) / diethyl ether; hexane / 20 h / Ambient temperature