Olivier Renaulta; Patrick Dallemagnea; Sylvain Raulta
FRIEDEL-CRAFTS ACYLATION WITH MALONIC ACIDS IN POLYPHOSPHORIC ACID
Organic Preparations and Procedures International, 1999 , vol. 31, # 3 p. 324 - 328
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http://dx.doi.org/10.1080/00304949909458327H. R. Snyder, C. T. Elston
Polyphosphoric Acid as a Reagent in Organic Chemistry. VII. Acylation
J. Am. Chem. Soc., 1955, 77 (2), pp 364–366
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http://dx.doi.org/10.1021/ja01607a038Howard D. Hartough, Alvin I. Kosak
Acylation Studies in the Thiophene and Furan Series. IV. Strong Inorganic Oxyacids as Catalysts
J. Am. Chem. Soc., 1947, 69 (12), pp 3093–3096
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http://dx.doi.org/10.1021/ja01204a049