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It is the purpose of this paper to show that in contrast with the now widely accepted view (see f.i. ref. 1) the bimolecular form of the Grignard reagent (I) is not necessarily the unique active species. In most cases the activity can just as well be attributed to the monomolecular form. Undoubtedly several forms including the monomeric are actually present in the solutions, but the question is which species is responsible for the Grignard reactions?
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M. Anteunis (1964) studied this question.
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