Two or more reactants form one product in a combination reaction. An example of a combination reaction is the formation of sulfur dioxide when sulfur is burned in air: S (s) + O2 (g

ke Nitration T. Zincke, J. Prakt. Chem. 61, 561 (1900). Replacement of ortho- or para-bromine or iodine atoms (but not fluorine or chlorine atoms) in ph

ke Disulfide Cleavage T. Zincke, Ber. 44, 769 (1911). Formation of sulfenyl halides by three essentially similar methods involving the action of chlorin

Zimmermann Reaction W. Zimmermann, Z. Physiol. Chem. 233, 257 (1935). The reaction that occurs between methylene ketones and aromatic polynitro compound

Wurtz Reaction A. Wurtz, Ann. Chim. Phys. [3] 44, 275 (1855); Ann. 96, 364 (1855). Coupling of two alkyl radicals by treating two moles of alkyl halides

Wolff Rearrangement L. Wolff Ann. 394, 25 (1912). Rearrangement of diazoketones to ketenes thermally, photochemically or catalytically. The rearrangemen

Wohl-Ziegler Reaction A. Wohl, Ber. 52, 51 (1919); K. Ziegler et al., Ann. 551, 30 (1942). Allylic bromination of olefins with N-. Peroxides or ultravio

Wohl Degradation; Zemplén Modification A. Wohl, Ber. 26, 730 (1893); 32, 3666 (1899); G. Zemplén, Ber. 59, 1254, 2402 (1926). Method for t

[2,3]-Wittig Rearrangement J. Cast et al., J. Chem. Soc. 1960, 3521; U. Schöllkopf, K. Fellenberger, Ber. 698, 80 (1966); Y. Makisumi, S. Notzumoto, Tetrahedron Lette

[1,2]-Wittig Rearrangement G. Wittig, L. Löhmann, Ann. 550, 260 (1942); G. Wittig, Experientia 14, 389 (1958). Rearrangement of ethers with alkyl l

Williamson Synthesis A. W. Williamson, J. Chem. Soc. 4, 229 (1852). Synthesis of ethers by alkylation of alkoxides with alkyl halides or alkyl sulfates:

Wichterle Reaction O. Wichterle et al., Coll. Czech. Chem. Commun. 13, 300 (1948). Modification of the Robinson annulation, q.v., in which 1,3-dichloro-

Whiting Reaction P. Nayler, M. C. Whiting, J. Chem. Soc. 1954, 4006. Alkynediols are reduced by lithium aluminum hydride in ether or tertiary amines to

Wharton Reaction P. S. Wharton, D. H. Bohlen, J. Org. Chem. 26, 3615 (1961); P. S. Wharton, ibid. 4781. Reduction of α,β-epoxy ketones by hyd

Weiss Reaction U. Weiss, J. M. Edwards, Tetrahedron Letters 1968, 4885. Reaction of 1,2-dicarbonyl compounds with 3-oxoglutarates to yield cis-bicyclo[3

Weerman Degradation R. A. Weerman, Rec. Trav. Chim. 37, 1, 16 (1918). Formation of an aldose with one less carbon from an aldonic acid by a Hofmann-type

Wallach Rearrangement O. Wallach, L. Belli, Ber. 13, 525 (1880). Acid-catalyzed rearrangement of azoxybenzenes to p-hydroxyazobenzenes:

Walden Inversion P. Walden, Ber. 28, 1287, 2766 (1895). Inversion of configuration of a chiral center in bimolecular nucleophilic substitution (SN2) rea

Wacker Oxidation J. Smidt et al., Angew. Chem. Int. Ed. 1, 176 (1959). The oxidation of ethylene to employing palladium chloride and cupric chloride as

Vorbrüggen Glycosylation U. Niedballa, H. Vorbrüggen, Angew. Chem. Int. Ed. 9, 461 (1970). The reaction of silylated heterocyclic bases with p