Magnesium isopropyl- halide

After addition of the acetaldehyde solution is complete, the product is decomposed by pouring the reaction mixture on to 2 kg. of cracked ice. The excess magnesium may be removed conveniently by decantation at this point. The basic magnesium halide is dissolved by addition of about 11. of 15 per cent sulfuric acid. The ether solution is separated, and the aqueous layer is extracted with four 150-cc. portions of ether. The ether solutions are combined, dried over 25 g. of calcined potassium carbonate, filtered and fractionally distilled, using a short column. The methyl isopropyl carbinol distils at no-ni.50. The fraction boiling 37 -1090 should be dried and refractionated. The total yield is 210-215 g. (53-54 per cent of the theoretical amount) (Note 7). 

Among secondary Grignard reagents that havo been added to ethylene oxide with substantially similar result [Pg.204]

A versatile method for the preparation of olefin metal complexes has been developed by E. 0. Fischer and his coworkers a Grignard reagent (preferably isopropyl magnesium bromide) is reacted with a mixture of a transition metal halide and an olefin in ether. Subsequent irradiation increases the yield and accelerates the formation of the corresponding metal complexes. 

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