Polonovski Reaction; Potier-Polonovski Reaction M. Polonovski, M. Polonovski, Bull. Soc. Chim. France 41, 1190 (1927). Rearrangement of tertiary amine o

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 A. Pinner, Ber. 23, 2919 (1890). Preparation of 2-hydroxy-4,6-diaryl-s-triazines by reaction of aryl amidines and phosgene. Th

Rearrangement R. Fittig, Ann. 114, 54 (1860). Acid-catalyzed rearrangement of vicinal diols to aldehydes or ketones:

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 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 Synthesis A. Pictet, T. Spengler, Ber. 44, 2030 (1911). Formation of tetrahydroisoquinoline derivatives by condensation of β-aryle

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 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 W. Perkow et al., Naturwiss. 39, 353 (1952). Formation of enol phosphates on treatment of α-halocarbonyl compounds with trialkyl p

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 W. H. Perkin, Jr., Ber. 16, 1793 (1883). Synthesis of alicyclic compounds from α,ω-dihaloalkanes and compounds co

Pelouze Synthesis J. Pelouze, Ann. 10, 249 (1834). Formation of nitriles from alkali cyanides by alkylation with alkyl sulfates or alkyl phosphates:

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 Synthesis H. v. Pechmann, Ber. 31, 2950 (1898). Formation of pyrazoles from acetylenes and diazomethane. The analogous addition of diazoacetic

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 G. B. Payne, J. Org. Chem. 27, 3819 (1962). Base-promoted isomerization of 2,3-epoxyalcohols. Configuration at C-2 is inverted:

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 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 L. E. Overman, J. Am. Chem. Soc. 96, 597 (1974); 98, 2901 (1976). Formal [3,3]-sigmatropic rearrangement of the trichloroacetimida