Acetyl chloride → Benzoic anhydride

Beteiligte Stoffe

Reaktionsschritte

As seen below, benzoyl chloride, acetyl chloride and pivaloyl chloride were tested for use in the present invention. The best results were obtained with benzoyl chloride, which provided a yield of the acrylic anhydride of 77.2%. Acetyl chloride gave a less preferred product mixture that comprised 50% mixed anhydride, 25% acetic anhydride and 25% acrylic anhydride; the pivaloyl chloride reaction also gave a less preferred product mixture that comprised 50% mixed anhydride, 30% pivaloyl anhydride and 20% acrylic anhydride, based on gas chromatographic analysis. Benzoyl chloride is also more preferred than acetyl chloride and trimethyacetyl (pivaloyl) chloride, because the benzoyl chloride reaction yields benzoic anhydride which has a much greater boiling point than acrylic anhydride, facilitating the separation of the acrylic anhydride.

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