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  • Polonovski Reaction
  • Polonovski Reaction; Potier-Polonovski Reaction M. Polonovski, M. Polonovski, Bull. Soc. Chim. France 41, 1190 (1927). Rearrangement of tertiary amine o
  • Piria Reaction
  • Piria Reaction R. Piria, Ann. 78, 31 (1851). Formation of arylsulfamic acids or sulfonation products or both by refluxing aromatic nitro compounds with
  • Pinner Triazine Synthesis
  • Pinner Triazine Synthesis A. Pinner, Ber. 23, 2919 (1890). Preparation of 2-hydroxy-4,6-diaryl-s-triazines by reaction of aryl amidines and phosgene. Th
  • Pinacol Rearrangement
  • Rearrangement R. Fittig, Ann. 114, 54 (1860). Acid-catalyzed rearrangement of vicinal diols to aldehydes or ketones:
  • Pinacol Coupling Reaction
  • Coupling Reaction R. Fittig, Ann. 110, 17 (1859). Formation of pinacols by a reductive radical-radical coupling of carbonyl compounds, especially keton
  • Piloty-Robinson Synthesis
  • Piloty-Robinson Synthesis O. Piloty, Ber. 43, 489 (1910); G. M. Robinson, R. Robinson, J. Chem. Soc. 43, 639 (1918). Formation of pyrroles by heating az
  • Pictet-Spengler Isoquinoline Synthesis
  • Pictet-Spengler Synthesis A. Pictet, T. Spengler, Ber. 44, 2030 (1911). Formation of tetrahydroisoquinoline derivatives by condensation of β-aryle
  • Pfitzinger Reaction
  • Pfitzinger Reaction W. Pfitzinger, J. Prakt. Chem. [2] 33, 100 (1886); 38, 582 (1888). Formation of -4-carboxylic acids by condensation of isatic acids
  • Pfau-Plattner Azulene Synthesis
  • Pfau-Plattner Synthesis A. St. Pfau, P. A. Plattner, Helv. Chim. Acta 22, 202 (1939). Formation of azulenes by ring enlargement of indanes on addition
  • Perkow Reaction
  • Perkow Reaction W. Perkow et al., Naturwiss. 39, 353 (1952). Formation of enol phosphates on treatment of α-halocarbonyl compounds with trialkyl p
  • Perkin Reaction
  • Perkin Reaction W. H. Perkin, J. Chem. Soc. 21, 53, 181 (1868); 31, 388 (1877). Formation of α,β-unsaturated carboxylic acids by aldol conden
  • Perkin Alicyclic Synthesis
  • Perkin Alicyclic Synthesis W. H. Perkin, Jr., Ber. 16, 1793 (1883). Synthesis of alicyclic compounds from α,ω-dihaloalkanes and compounds co
  • Pelouze Synthesis
  • Pelouze Synthesis J. Pelouze, Ann. 10, 249 (1834). Formation of nitriles from alkali cyanides by alkylation with alkyl sulfates or alkyl phosphates:
  • Pellizzari Reaction
  • Pellizzari Reaction G. Pellizzari, Gazz. Chim. Ital. 41, II, 20 (1911). Formation of substituted 1,2,4-triazoles by the condensation of amides and acyl
  • Pechmann Pyrazole Synthesis
  • Pechmann Synthesis H. v. Pechmann, Ber. 31, 2950 (1898). Formation of pyrazoles from acetylenes and diazomethane. The analogous addition of diazoacetic
  • Pechmann Condensation
  • Pechmann Condensation H. v. Pechmann, C. Duisberg, Ber. 16, 2119 (1883). Synthesis of coumarins by condensation of phenols with β-keto esters in th
  • Payne Rearrangement
  • Payne Rearrangement G. B. Payne, J. Org. Chem. 27, 3819 (1962). Base-promoted isomerization of 2,3-epoxyalcohols. Configuration at C-2 is inverted:
  • Passerini Reaction
  • Passerini Reaction M. Passerini, Gazz. Chim. Ital. 51, 126, 181 (1921). Formation of α-hydroxycarboxamides on treatment of an isonitrile with a ca
  • Parham Cyclization
  • Parham Cyclization W. E. Parham et al., J. Org. Chem. 40, 2394 (1975). Four- to seven-membered ring annulation of aryl bromides bearing ortho side chain
  • Overman Rearrangement
  • Overman Rearrangement L. E. Overman, J. Am. Chem. Soc. 96, 597 (1974); 98, 2901 (1976). Formal [3,3]-sigmatropic rearrangement of the trichloroacetimida
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