p-Toluenesulfonic acid → 2,6,7-Trioxabicyclo[2.2.2]octane, 1,4-diethyl-

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Reaction Steps

Into a flask as specified in Example 1 were charged 529 g of triethyl orthopropionate, 402 g of trimethylol propane, 330 g of diethylene glycol dimethyl ether, and 0.9 g of PTSA. The mixture was heated for 0.5 hour at 140° C., with 402 g of ethanol being distilled off. The temperature was lowered to 100° C., and the remaining diethylene glycol dimethyl ether was distilled off under reduced pressure. The residue was subjected to vacuum distillation. The fraction having a boiling temperature of 54° C. at a pressure of 0.5 mbar yielded 370 g of clear, low-viscous liquid having a boiling point of 223° C. at atmospheric pressure and with the following structure

Provenance & Evidence