Abstract: The crystalline 2, 3, 5-tri-O-benzoyl-α-D-ribofuranosyl chloride was obtained for the first time. The Ness' method of synthesis of crystalline 2,3,5-tri-O-benzoyl-α-D-arabinofuranosyl bromide was improved and the yield of the product frommethyl 2, 3, 5-tri-O-benzoyl-α-D-arabinofuranoside was raised from 61% to 96%.