Magnesium halides

Halide Magnesium/ Halide Ratio Temper- ature (°) Time (minutes) Yield of Product (%) ... 

Acyl halides Magnesium sulphate, sodium sulphate. 

Some examples of the application of the general methods for forming the Ar-Sn bond, which are described in Chapter 3, are given in equations 7-1,2 7-2,3 and 7-3.4 Lee has described the synthesis of arylstannanes in good yield by the Barbier reaction between aryl halides, magnesium, and bis(tributyltin) oxide, with ultrasonication (equation 7-4).5... 

Bicyclo[4.1.0]heptan-2-ol 8 was also cleaved by magnesium halides, or a mixture of zinc and magnesium halides. Magnesium chloride afforded a good yield of 4-chlorocycloheptene (9), but the magnesium bromide or iodide promoted rearrangements, with or without zinc halide, gave mainly 3-(halomethyl)cyclohexenes. ... 

The cryocheinical technique has been used to prepare organomagnesium compounds. Skcll and Girard were the first to report 3] an investigation of the low-tempcraturc co-condensation of magnesium and an organic halide. Magnesium vapour co-condensates were obtained with propyl chloride and propyl bromide at 77 K. The products... 

Table 2.9. Yields of 5-hexen-3-ol, obtained in the Barbier reaction of allyl halides, magnesium and propanal in diethyl ether and tetrahydro-furan respectively [53]...

Table 2.12. Yields of different tertiary homoallylic alcohols from Barbier reactions of crotyl halides, magnesium and ethyl ethanoate in several different solvents and solvent mixtures [53]...

Table 2.15. Barbier reactions between an organic halide, magnesium and an organic substrate with either benzene or petroleum ether as the solvent as studied by Oddo and Del Rosso [91].

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