Abstract
A mixture of ethyl bromide, aluminum and magnesium powders was irradiated with ultrasound and ethylaluminum sesquibromide(I) formed at room temperature. As soon as diethyl ether was introduced into the reaction medium, ethylmagnesium bromide (II) was formed in situ and subsequently treated with I to give the etherate of triethylaluminum (III, TEA · OEt 2) in satisfactory yield (82%) and purity (98%). III, thus obtained, could react with triethyl borate or zinc chloride to give triethylborane (90%) and diethylzinc (82%) respectively.
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