Magnesium n-butyl bromide

C4H, MgBr + HCOOCaHs (C H.ajaCHOMgBr + CjHjOMgBr n-Butyl magnesium bromide Ethyl formate... 

The 1 -phenyl-pentanol-(1) may be prepared in any convenient manner. Benzaldehyde may be reacted with n-butyl-magnesium bromide, and after purification 1-phenyl-pentanol-(1) Is obtained in the form of a colorless oil at room temperature. 

Trimethyl-n-butylsilicane.—It is first necessary to obtain n-butyltrichlorosilicane by the action of n-butyl magnesium bromide on silicon tetrachloride. The product, boiling at 147° to 151° C., is a liquid, fuming in moist air, and when treated with methyl magnesium bromide, trimethyl-n-butylsilieane is formed, B.pt. 115° C. 

Lead methyl ethyl n-propyl n-butyl.—Lead dimethyl ethyl n-propyl is brominated at —75° C., when one methyl group is split off and the bromide formed. The latter is then treated with n-butyl magnesium bromide, the above compound being obtained in 90 per cent, yield. It has B.pt. 103° C, at 13 mm. density 1-5068 at 23-5° C. Ub 1-5072 nF -nc 0-01607 at 22-4° C. 

Ether is very hygroscopic and therefore it is usually advisable to distill it from a drying agent directly into the reaction flask by means of the apparatus shown in Fig. 5-36, preferably with a metal-coil condenser to increase the capacity. Lithium aluminum hydride or n-butyl magnesium bromide are particularly satisfactory as final drying agents (after the initial drying over sodium), since they will not only remove the water but will prevent the accumulation of peroxides as well. 

C4H, MgBr + HCOOCjHs— (C4Hg )iiCHOMgBr + CgHjOMgBr n-Butyl magnesium bromide Ethyl fomate... 

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