Preparation of O-isopropylidene sugar derivatives^a.

Entry	Sugar	O-Isopropylidene derivatives	Yield (%)
1	d-Glucose		95
2	d-Ribose		95
3	d-Mannose		95
4	l-Arabinose		95
5	d-Galactose		97

^aReagents and conditions: 2 : 2 : 1 molar ratios of PS-TPP : I₂ : sugar, acetone, RT, 45 min.