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Grignard reactions in 4‐MeTHP. Each reaction was carried out with aryl or alkyl halide (10 mmol), magnesium (15 mmol), DIBALH (0.0075 mmol) and benzaldehyde (10 mmol). For the formation of propargylmagnesium bromide, HgCl2 (0.0050 mmol) was added [Eq. (3)]. For the formation of arylmagnesium chloride, ten times amount of DIBALH (0.075 mmol) was used [Eq. 4)].
