[OH:1][CH2:2][C:3]([CH2:8][OH:9])([CH3:7])[C:4]([OH:6])=[O:5].C1(C)C=CC(S(O)(=O)=O)=CC=1.CO[C:23](OC)([C:30]1[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=1)[C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1.O>C1(C)C=CC=CC=1>[CH3:7][C:3]1([C:4]([OH:6])=[O:5])[CH2:8][O:9][C:23]([C:24]2[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=2)([C:30]2[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=2)[O:1][CH2:2]1In a round bottom flask, (12 g) 3-hydroxy-2-(hydroxymethyl)-2-methylpropanoic acid and 35 ml toluene was taken. (99.4 mg) p-toluene sulfonic acid was added into the reaction mixture at 25-30° C. temperature. The reaction mixture was heated at reflux temperature, and 20.5 g (1 equiv.) dimethoxy diphenylmethane [IIa3] in 35 ml toluene was added and it was further refluxed under dean stark. Continuous removal and addition of toluene done upto 3 hrs. Then reaction mixture was cooled at 25-30° C. and dumped into water. The reaction mixture was stirred at 20-30° C. and filter it and wash the solid mass with water to obtain white solid product.
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