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Keller, P. A., Science of Synthesis, (2007) 20, 619.
The reaction of triphenylphosphine with benzoquinone derivatives 9 produces a violet complex 10, which can be used to promote the formation of anhydrides 11 from carboxylic acids in 50–90% yields (Scheme 5).[18] Anhydrides produced by this method include mesitoic, benzoic, pivalic, and butyric anhydride. In a variation of this procedure, the use of tertiary phosphines and diphenylmercury, in the presence of carboxylic acids, also gives the anhydrides in 74–80% yield.[19]
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References
[18] | Meeeeeee, M.; Meee, M., Meeeeeeeeee Meee., (8888) 88, 8888. |
[19] | Meeeeeeee, M.; Meeeeeee, M.; Meeeee, M., M. Mee. Meee., (8888) 88, 8888. |
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- 8.Meeeee-Meee, (8888) M 8-8, 888.