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The [Cp*CpZrNCMe3(thf)] system provides the first direct measurement of kinetic selectivity in sp, sp2, and sp3 CH bond activation with Group 4 imido complexes. This feature allows the design of selectivity and mechanistic experiments to probe the 1,2-RH-addition event. Substrates reacting with the highest relative rates generally form the most thermodynamically stable products. Cp*=η5-C5Me5, Cp=η5-C5H5.
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Hoyt et al. (2007) studied this question.
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