The most active synthetic homogeneous catalysts yet obtained are solutions of EtAlCl2 and (π‐C3H5)NiBrP(C6H11)3 which effect the dimerization of propylene. The catalysts are about 1000 times as active as was determined in 1963 under unfavorable experimental conditions. The turnover number/s extrapolated to room temperature is ca. 60 000; compare 100 for hexokinase, 80 000 for catalase, and 600 000 for carboanhydrase.
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Bogdanović et al. (1980) studied this question.