Pentafluorophenylammonium triflate

Other recent relevant developments have been the replacement of conventional acid catalysts with greener analogues. Direct esterification of carbo Q lic acids and alcohols continues to be a focus of attention. As examples, diphenylammonium triflate 8 and bulky diatylammonium sulfonates were shown to catalyse ester condensation of carboxylic acids and alcohols efficiently, and without the need for azeotropic water removal in the former case. Pentafluorophenylammonium triflate 9 was shown to be an efficient and cost-effective catalyst not only for esterification, but also for thioesterification, transesterification and macrolactone formation without requiring a dehydrating system. The superior catal)4ic efficiency of 9 relative to 8 was ascribed to the lower basicity of the pentafluoroaniline counter amine compared to diphenylamine. In related work, polyaniline... 

M. Ghashang, S. Sheik Mansoor, K. As win, Pentafluorophenylammonium triflate (PFPAT) catalyzed facile construction of substituted chromeno[2,3-d]pyrimidinone derivatives and their antimicrobial activity, J. Adv. Res. 5 (2014) 209-218. 

Montazeri, N. Khaksar, S. Nazari, A. Alavi, S. S. Vahdat, S. M. Tajbakhsh, M. Pentafluorophenylammonium triflate (PFPAT) An efficient, metal-free and reusable catalyst for the von Pechmann reaction. /. Fluorine Chem. 2011, 132, 450-452. 

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See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

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