Ethylene Glycol → 1,5-Dioxa-9-azaspiro[5.5]undecane, 8,8,10,10-tetramethyl-

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Use of Phosphoric Acid 77 g of triacetonamine were initially charged in 240 g of toluene together with 47 g of ethylene glycol. Subsequently, sufficient phosphoric acid (63 g) was added that the reaction mixture showed an acidic pH (≦2) when tested with a moistened indicator paper. The reaction mixture was heated to reflux temperature and water of reaction formed was removed on a water separator. After approx. 3 hours, there was less than 10% of the desired product according to the gas chromatogram. Instead, a plurality of secondary components had formed which were not investigated further.

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