Gold-carbon bond cleavage

A considerable difference in reactivity toward gold-carbon bond cleavage is found for methylgold(I) and -gold(III) compounds. Thus, for the reactions with benzenethiol, which proceed by elimination of methane, the following order of reactivity is obtained 207, 208) ... 

The first method has been used with haloaryl,1639-1643 urt/m-nitrophenyl,1644 mesityl,255 or ylidegold(I)1645-1648 complexes, which are sufficiently stable to undergo the oxidative addition without cleavage of the gold-carbon bond, an example can be seen in Equation (11) ... 

E. Reactions Involving Cleavage of the Gold-Carbon Bond. . 69... 

Gold.—Cleavage of the gold(i)-carbon bond in the complexes [AuMeCPRs)] by benzenethiol occurs via the free-radical chain mechanism discussed above for the reactions of benzenethiol with platinum(n)-carbon bonded complexes (Scheme 11). However, no radicals could be detected in the following reaction with gold(iii) complexes ... 

A polypyrrole film electrochemically deposited on gold electrodes from an MeCN-liCl04/Co(OAc)2 solution shows electrocatalytic activity in dioxygen reduction [404]. The catalytic electroreduction of dithio dipropionic acid (PSSP) with the water-soluhle cohalt(II I)tetrakis(4-trimethyl-ammonium phenyl) porphyrin (CoTMAP) has heen studied. The Co catalyst adsorbed on the glassy carbon electrode plays a major role in the electroreductive cleavage of the S—S bond [405]. 

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