beta3,beta3,beta9,beta9-Tetramethyl-2,4,8,10-tetraoxaspiro(5.5)undecane-3,9-diethanol → 3,9-Bis[2-[3-(3-tert-butyl-4-hydroxy-5-isopropylphenyl)propionyloxy]-1,1-dimethylethyl]-2,4,8,10-tetraoxaspiro[5.5]undecane

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A mixture of 33.6 g (0.121 mole) of methyl 3-(3-tert-butyl-4-hydroxy-5-isopropylphenyl)propionate, 15.3 l g (0.0503 mole) of 3,9-bis(2-hydroxy-1,1-dimethylethyl)-2,4,8,10-tetraoxaspiro[5.5]undecane and 0.82 g (0.015 mole) of sodium methoxide was reacted, after-treated and purified in the same manner as in Preparation example 1, to obtain 29 g of colorless and glassy 3,9-bis{2-[3-(3-tert-butyl-4-hydroxy-5-isopropylphenyl)propionyloxy]-1,1-dimethylethyl}-2,4,8,10-tetraoxaspiro[5.5]undecane having a purity of 98% (compound I-2). m.p., 47°-57° C.

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