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29144447181
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note
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According to ICPMS measurements the copper content of the commercial diethylzinc solutions used is (50 ± 5) μM or less. This gives a ligand/copper ratio of at least 100:1 and a zinc/copper ratio of at least 20 000:1. We assume that these copper ions do not play any role in the catalyst cycle since other catalysts show no cuprate-like behavior. We thank Dr. Zsolt Berner, Institut für Mineralogie und Geochemie der Universität Karlsruhe (TH), for carrying out these measurements.
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