2,2'-((1-Methylethylidene)bis(cyclohexane-4,1-diyloxymethylene))bisoxirane → 2,2-Bis{4-[2-hydroxy-3-(7,7,8,9,9-pentamethyl2,4-dioxo-1,3,8-triazaspiro[4.5]dec-3-yl)propoxy]cyclohexyl}propane

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A mixture of 8 g of 7,7,8,9,9-pentamethyl-1,3,8-triazaspiro[4.5]decane-2,4-dione and 5 g of 2,2-bis[4-(2,3-epoxypropoxy)cyclohexyl]propane was heated at 180°-200° C. for 5 hours. The reaction mixture was then purified by column chromatography through silica gel eluted with a 60:10:1 by volume mixture of ethyl acetate, ethanol and triethylamine and then by recrystallisation from ethyl acetate, giving the desired compound in the form of white crystals melting at 130°-133° C.

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