perchloric acid in methanol; water T=25 - 30°C; 0.25 h;

triethylsilane; acetyl-bromide; 2,2'-azo-bisisobutyronitrile; tri-n-butyl-tin hydride; stannous bromide multistep reaction: reduction of acetals; other reagents, other substrates;

triethylsilane; acetyl-bromide; stannous bromide in dichloromethane T=0°C; 1 h;

triethylsilane; acetyl chloride; tin(ll) chloride in dichloromethane T=0°C; 2 h;