Group-IIIB-transition metal bonds reactions with

Group-IIIB-Transition- or-Inner Transition-Metal Bonds 6.5.3. Formation from Other Group-IIIB Compounds 6.S.3.4. by Reaction with Metal Halides... 

Reactions of dinuclear transition metal carbonyls with Ga, In, or T1 in the +1 state proceed by oxidative addition, which leads to insertion of the group IIIB element into the metal-metal bond. From the reaction of InBr with Co2(CO)8 in THE, the product is BrIn[Co(CO)4]2-THF, while the halides Ga2X4 (X = Cl or Br) yield XjGaCoICO) THE, in which both Ga centers attain the +3 stateh The same products can be isolated from reactions of the group IIIB halides, MX3, with NaCo(CO)4 or Co2(CO)g in Thfi-3. 

Reactions of transition metal carbonyls with an In(I) center also take place by oxidative addition here InX inserts into the M-X bond. Oxidative addition to the low-valent halides of Ga, In, or T1 thus provides a useful route to compounds with group IIIB-metal bonds This approach is particularly useful when the salt elimination route cannot be employed because a suitable transition metal nucleophile is lacking. 

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