Halogenomethylation group

The dipole moments of 3,3 bis halogenomethyl)oxctaneB hnvi-been interpreted as indicating that there is considerable free roifktiou of the halogenomethyl groups of these molcouics in benzene solution... 

In pursuit of a stereoselective synthesis of carbohydrates by telomerization of halogenated vinylene carbonates, Japanese authors have reported that nickel carbonyl in THF reductively converts polyhalogenomethyl groups into di- or mono-halogenomethyl groups under relatively mild conditions. 

Halogenomethyl, hydroxymethyl and aminomethyl groups readily undergo displacement reactions with nucleophilic reagents. Both side-chain and nuclear substitution products have been obtained (Scheme 57). These two possibilities are exemplified by the reaction of furfuryl chloride with sodium cyanide (Scheme 58). 

A series of new 3,4-substituted furazans 95-99 were synthesized by transformation of the functional groups in halogenomethyl and biacyl derivatives of furazan (Scheme 24) <2000CHE1091>. 

Reactions 7-47 and 7-48 are obviously not restricted to diazonio substituents as leaving groups. Analogous reactions have often been conducted with halogenomethyl- and other substituted methylcycloalkanols (see review of Larock, 1989, p. 630). Ring enlargements of cycloalkanones were also reviewed by Burke and Grieco (1979), Smith and Dieter (1981), Black (1983), and Anderson (1985). 

Halogenolysis s. Brominolysis, Chlorinolysis, Replacement of alkyl groups by halogen Halogenomethylation (s. a. Ghloromethylation)... 

Wittig reagents," decarbonylation," oxidation, oxime formation, and fluorination, to afford a variety of novel cephalosporins. Acid (73 c), also prepared from (65), in which the carboxy-group has been translocated to the abnormal C-3 position, has been reported to have only weak antibacterial activity. Recently, a more direct synthesis of 3-halogenomethyl-cephalosporins (74) and (75) has been described in which a boron trihalide effected the replacement of the 3-acetoxy-group by a halogen atom. Similarly, (75 X = OAc or... 

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