Grignard reagents, bonding halide

Grignard reagents replace halides from the [NiX(L)]+ derivatives by o-bonded alkyl and aryl groups (equation 174), giving a series of diamagnetic organometallic complexes of nickel(H) (189) (Table 74).1444... 

The preparation of organolithium compounds and of Grignard reagents from halides is successful only when these reagents contain virtually no functional groups. Furthermore, these C nucleophiles can be added to the C=0 double bond of a carbonyl compound only when this carbonyl compound also contains practically no additional electrophilic group(s). 

Grignard reagent (organomagnesium halide) (Section 18.5) An oiganometallic species with a carbon—magnesium bond RMgX. 

Grignard reagents Organomagnesium halides RMgX having a C-Mg bond, halohydrins Halo alcohols. For example, ethylene bromohydrin is BrCH2CH20H. helicenes Ortho-fused polycyclic aromatic compounds that have a helical structure. 

Grignard reagents - Organomagnesium halides, RMgX, having a carbon-magnesium bond (or their equilibrium mixtures in solution with R Mg + MgX ). [5]... 

M-C(t bonds can be formed by each of the metals. The simple alkyls and ai7ls of Ag are less stable than those of Cu while those of Au have not been isolated. Copper alkyls and ai7ls are prepared by the action of LiR or a Grignard reagent on a Cu halide ... 

Stabilization of intermediates by strong adsorption will frequently be a necessary precondition for synthesis. Thus, in the case of the Kolbe reaction, further oxidation of the radicals is prevented the formation of metal-carbon bonds in the reduction of alkyl halides (Fleischmann et al., 1971a Galli and Olivani, 1970) or oxidation of Grignard reagents (Fleischmann et al., 1972c) is shown by the isolation of organometallic... 

Structural types for organometallic rhodium and iridium porphyrins mostly comprise five- or six-coordinate complexes (Por)M(R) or (Por)M(R)(L), where R is a (T-bonded alkyl, aryl, or other organic fragment, and Lisa neutral donor. Most examples contain rhodium, and the chemistry of the corresponding iridium porphyrins is much more scarce. The classical methods of preparation of these complexes involves either reaction of Rh(III) halides Rh(Por)X with organolithium or Grignard reagents, or reaction of Rh(I) anions [Rh(Por)] with alkyl or aryl halides. In this sense the chemistry parallels that of iron and cobalt porphyrins. 

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