Organozincs lead oxides

The mechanism of the ZnBr2-assisted, nickel-catalyzed Reformatsky reaction has been discussed [540]. The reaction involves the electroreduction of a Ni(II) complex to a Ni(0) complex, oxidative addition of the a-chloroester to the Ni(0) complex, and Zn(II)/Ni(II) transmetallation, leading to an organozinc Reformatsky reagent. Most recently, the Reformatsky reaction... 

Moreover, at lower temperature, a clean and rapid oxidative insertion of activated zinc metal into the carbon-iodine bond is observed and leads to the acyclic zinc derivative 53 in 95% yield, contamined by 5% of cyclized product. The formation of the linear organozinc iodide 53 and its subsequent cyclization by warming to room temperature can be taken as a hint of the absence of a one-electron transfer process in the cyclization [55]. These... 

Swager and coworkers synthesized receptor polymers 102 and 103 [209,210]. The polymers were prepared by copolymerization of 2,5-dibromo-3-decylthiophene or 3,3 -bis(methoxyethoxy)-2,2 -bithiophene with the organozinc derivative of the macrocyclic 3,3 -dialkoxy-2,2 -bithiophene by palladium-catalyzed cross-coupling. Cyclic voltammetry and in situ conductivity measurements on polymer films have evidenced the complexation of paraquat derivatives. However, the complexation between polymer films and acceptors can lead to opposite shifts of oxidation potential of the polymer due to the interplay of donor-acceptor interaction and conformational changes of the polymer. 

The oxidative addition of zinc dust to functionalized organic halides allows the preparation of a broad range of polyfunctional organozinc iodides such as 1-5 (10-14]. Several functional groups such as nitro or azide groups inhibit the radical-transfer reaction leading to the zinc reagent. On another hand, hydroxyl... 

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