The reaction of p,p'-dichlorobenzophenone with SmI2 was studied in the presence of variable amounts of HMPA. The electron-transfer step takes place instantaneously. In the presence of excess substrate, the addition of HMPA retarded the rate of coupling to pinacol by a factor of 250. In the presence of an excess of SmI2, the initial rate retardation is followed by a dramatic increase in rate.
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| http://dx.doi.org/10.1021/ol7029883 | DOI Listing |
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