Halogen oxidative addition reaction

The heterocyclic telluride 32 is susceptible to oxidation-addition reactions and readily adds halogen atoms under a treatment with halogens or sulfuryl chloride (93MI1). Compounds 34 were obtained in almost quantitative yields. 

Aryl Halides from Diazonium Ion Intermediates. Replacement of diazonium groups by halides is a valuable alternative to direct halogenation for the preparation of aryl halides. Aryl bromides and chlorides are usually prepared by a reaction using the appropriate Cu(I) salt, which is known as the Sandmeyer reaction. Under the classic conditions, the diazonium salt is added to a hot acidic solution of the cuprous halide.99 The Sandmeyer reaction occurs by an oxidative addition reaction of the diazonium ion with Cu(I) and halide transfer from a Cu(III) intermediate. 

Klabunde has reported limited reactivity toward oxidative addition reactions of carbon halogen bonds with nickel slurries prepared by the metal vaporization technique(65). 

The iron slurries show exceptional reactivity toward oxidative addition reactions with carbon halogen bonds. In fact, the reaction with C.FcI is so exothermic that the slurry has to be cooled to 0 °C before the addition of C F L The reaction of iron with C F Br is also quite exothermic, hence, even for this addition, the iron slurry is cooled to about 0 ° C. The organoiron compound formed in the above reactions, solvated Fe(C.F )2, reacts with CO at room temperature and ambient pressure to yiela Fe(C,F3)2(CO)2(DMEL. 

The major route to -cyclopropenylium complexes L M(C3R3) (metallatetrahedranes) is by oxidative addition reactions of cyclopropenylium salts to transition metal complexes of groups 5 (V), 6 (Mo, W), 8 (Fe, Ru), 9 (Co, Rh, Ir) and 10 (Ni, Pd, Pt). The addition is frequently accompanied by loss of one or more carbonyl, olefin or halogen auxiliary ligand. Concurrent formation of oxocyclobutenyl complexes by carbonyl insertion into the cyclopropenyl ring is often observed in reactions with group 9 cobalt triad and early transition metal complexes. 

As a cyclic telluride, tellurachromanone is prone to oxidative addition reactions which increase the coordination number of the tellurium atom to 3 or 4 (90UP1). Under mild conditions tellurachromanone adds halogens,... 

Attempted oxidative addition reactions involving cleavage of silicon-halogen bonds have proved unsuccessful (see entries 26 and 52), and when Si-H and Si-halogen bonds are present in the same molecule, it is the former that cleaves, even in the case of iodine (entries 34 and 55). For example,... 

The range of products that can be obtained from oxidative addition reactions is illustrated by those of [Rh(diphos)2]Cl (Figure 6). Other small molecules besides the halogens add oxidatively to [Rh(LL)2]X complexes. Hydrogen adds reversibly to [Rh (Me2P)2C2H4 2]Cl, to form a dihydrido complex (equation 238). The dihydrido complexes have generally been prepared by oxidative addition reactions their physical properties are listed in Table 79. 

Oxidative-Addition Reactions. Chuck Kirkpatrick has been studying oxidative additions to Mo2(0Pr1)j- (M=M) (30). Addition of Pr OOPr1 leads to Mo2(0Pr1)g (M=M) (7). Addition of each of the halogens C, and proceeds to give the compounds... 

Oxidative addition to mononuclear centers is well known, and, in view of the high electron density in the MeM bond, one expects oxidative addition reactions across the metal-metal multiple bonds. These reactions are the analogues of consecutive additions of an electrophile and a nucleophile across the C=C bond, as in halogenation (eq. 11). As was the case with nucleophilic addition... 

The product is unstable in solution above 40°C. A similar oxidative addition reaction takes place with xs acetaldehyde and Os(CO)2(PPh3)3 in benzene solution under a tungsten halogen lamp. No intermediate r/ -aldehyde complex is seen . 

Oxidative addition reactions of halogens (X2) with the Pt(II) complex in aqueous solution give the corresponding Pt(III) dimers with X at both axial positions (52, 52). 

Deactivation against electrophilic attack accounts for the difficulty or failure of nitration, sulfonation and iV-oxidation of 1,2,4-triazoles proper. However, triazolate anions react readily with electrophilic reagents alkylation and acylation have received much attention but halogenation and addition reactions less. Systematic study of the formation and reactions of salts and metallic complexes is of recent origin. 

An excellent discussion on oxidative addition reactions involving halogen-containing compounds can be found in 5.8.2.9.I. These principles can be extended to oxidative additions involving other reactants as well. We attempt to adhere to the definitions presented therein. 

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