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

Oppenauer Oxidation R. V. Oppenauer, Rec. Trav. Chim. 56, 137 (1937). The aluminum or potassium alkoxide-catalyzed oxidation of a secondary alcohol to t

Peterson Reaction (Olefination) D. J. Peterson, J. Org. Chem. 33, 780 (1968). Reaction of α-silyl carbanions with carbonyl compounds yielding &bet

Olefin Metathesis -carbon bond rearrangements in presence of metal carbene catalyst complexes especially those of molybdenum and ruthenium:

Noyori ation T. Ikariya et al., Chem. Commun. 1985, 922; R. Noyori et al., J. Am. Chem. Soc. 108, 7117 (1986). Homogeneous asymmetric catalytic hydrogen

Norrish Type Cleavage R. G. W. Norrish, C. H. Bamford, Nature 138, 1016 (1936); 140, 195 (1937). Norrish Type I Cleavage: Homolytic cleavage of aldehyde

Nierenstein Reaction D. A. Clibbens, M. Nierenstein, J. Chem. Soc. 107, 1491 (1915). Formation of ω-chloroacetophenones by reaction of diazomethan

Niementowski Synthesis S. v. Niementowski, Ber. 27, 1394 (1894); 28, 2809 (1895); 38, 2044 (1905); 40, 4285 (1907). Formation of γ-hydroxyquinoli

Niementowski Synthesis S. v. Niementowski, J. Prakt. Chem. [2] 51, 564 (1895). Formation of 4-oxo-3,4-dihydroquinazolines by cyclization of the reactio

Nicholas Reaction R. F. Lockwood, K. M. Nicholas, Tetrahedron Letters 1977, 4163. The reaction of dicobalthexacarbonyl-stabilized propargyl cations with

Nenitzescu Reductive Acylation C. D. Nenitzescu, E. Cioranescu, Ber. 69, 1820 (1936). ative acylation of cycloolefins with acid chlorides in the presenc

Nenitzescu Synthesis C. D. Nenitzescu, Bull. Soc. Chim. Romania 11, 37 (1929). Synthesis of 5-hydroxyindole derivatives by condensation of with β

Nencki Reaction M. Nencki, N. Sieber, J. Prakt. Chem. (2) 23, 147 (1881). The ring acylation of phenols with acids in the presence of zinc chloride, or

Negishi Cross Coupling E. Negishi et al., J. Org. Chem. 42, 1821 (1977). Formation of unsymmetric biaryls by cross coupling arylhalides with arylzinc re