Dehalogenation Dehydration

Dehalogenation of l,l,2-trichloro-2,3,3-trifluorocyclobutane, 43,45 Dehydration of formamides with phosphorus oxychloride to isocyanides, 41, 13, 101... 

Alkenes are obtained by the transformation of various functional groups, e.g. dehydration of alcohols (see Section 5.4.3), dehalogenation of alkyl halides (see Section 5.4.5) and dehalogenation or reduction of alkyl dihalides (see Section 5.4.5). These reactions are known as elimination reactions. An elimination reaction results when a proton and a leaving group are removed from adjacent carbon atoms, giving rise to a tt bond between the two carbon atoms. 

The elimination reactions involving dehalogenation, dehydrohalogenation, and dehydration are often laborious compared to the more recent techniques involving dehalogenation of gem-dihalocyclopropanes [10a, b]. However, the availability of the starting materials is the deciding factor. 

Consequently, degradation of halogenated compounds in gaseous effluents, especially in diluted effluents, is often problematic, dehalogenation being the limiting step. In order to overcome this problem, a new process, based on solid/gas catalysis with whole dehydrated cells as the catalyst, has been proposed [14]. The aim is to convert halogenated compounds into alcohols. 

Tris(phenylthio)antimony, 337 Dechlorination (see Reduction reactions) Deconjugation (see Isomerization) Defluorination (see Reduction reactions) Dehalogenation (see Elimination reactions, Reduction reactions) Dehydration (see also Elimination reactions)... 

Dealkylation of tertiary amines with dibenzoyl peroxide, 44, 74 Decarboxylation, intermolecular, of isocyanates to carbodiimides, 43,32 Decker synthesis of amines, 44, 7t, 75 Dehalogenation of l,l,2-trichloro-2,3,3-trifluorocydobutane, 42,45 Dehydration, of formamides with phosphorus oxychloride to isocy-anides, 41, 13, 101 of 4- 2-hydroxyethyl)piperidine to quinuclidine, 44, 90 Dehydrohalogenation of 2-chloroallyl-amines to propargylamines, 44,55 Delepine reaction, to prepare 2-bromo-allylamine, 43, 6 Deoxyanisoin, 40,16 Deoxybenzoin, 40, IT Deoxypiperoin, 40, IT Deaylamine, 41, 8T... 

Predict the major and minor products of dehydrohalogenation of alkyl halides, dehalogenation of dibromides, and dehydration of alcohols. 

Propose logical mechanisms for dehydrohalogenation, dehalogenation, and dehydration reactions. 

DEHALOGENATION Diiron nonacarbonyl. Lithium amalgam. Phenanthrcnc-Sodium. Sodium thiosulfate. Triethyl phosphite. DEHYDRATION Alumina. Boron trifluo-ride n-butyl etherate. Dimethyl sulfoxide. Hcxamethylphosphoric triamidc. Iodine. Methyl N-suIfonylurethanc tricthylamine complex. Phosphonitrilic chloride. Thio-nyl chloride. Triphenylphosphite methlo-dide. 

Dehydrohalogenation of Alkyl Halides Dehalogenation of 12-Dihalides Dehydration of Alcohols Alkenes from Ethers... 

Hydrolysis of esters and ethers, hydrolytic cleavage of C—N single bonds, hydrolytic cleavage of nonaromatic heterocycles, hydration and dehydration at m ultiple bonds, new atomic linkages resulting from dehydration reactions, hydrolytic dehalogenation removal of hydrogen halide molecules, various reactions. 

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