Diarylmethyl Ethers for the Protection of Polyols

Scheme 7

Tin(II) chloride catalyzed reactions of diazo [bis(4-methoxyphenyl)]methane with methyl 4,6-O-benzylidene-α-D-mannopyranoside and the reactions of five diaryldiazomethanes with methyl 4,6-O-isopropylidene-α-D-mannopyranoside.