Acetic Anhydride → 3,4-Diacetoxy-1-butene

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A 300-mL autoclave was charged with 40 mL (0.50 mol) of 3,4-epoxy-1-butene, 63.2 g (0.62 mol) acetic anhydride, 4.06 g (0.041 mol) of triethylamine and 4.2 mL of diglyme. The autoclave was purged with nitrogen twice, then the vessel was pressurized to 8 bars (100 psig) with nitrogen. The agitator was started and an initial sample was taken. The mixture was heated to 125° C. During the course of 2.5 hrs, samples were taken every 15 min for analysis by GC. GC analysis of the crude mixture after 2.5 hrs revealed a 92% yield of 3,4-diacetoxy-1-butene with a 92% selectivity and 0.36% 3,4-epoxy-1-butene. The reaction was observed to be first order in 3,4-epoxy-1-butene with a first order rate constant of 0.037 min-1 (Table A). This example demonstrates the catalytic effect of the tertiary amine alone.

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