Abstract
Abstract The effect of reflected sunlight on the formation of Grignard reagents has been reported1. In the present work irradiation of mixtures of magnesium turnings and organic halides in dry diethyl ether by the method of Evans et al.2 gave elevated yields of Grignard reagents as compared to those achieved in control experiments carried out in the absence of light. Four organic halides: 2-bromofluorene, 2-bromothiophene, chlorobenzene and chlorodiphenylmethane were selected for study in the light of their reputed poor performance in the Grignard reaction3. A quantitative estimate of the amount of Grignard reagent formed in each reaction was carried out by the method of Gorog and Szepesi4. The experimental results are shown in the table.
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