The sequence of addition of the ether solution is employed to prevent the grignard reagent from decomposing. The mechanism of the coupling process is not well understood, but it is known that the rate of the coupling process appears to depend on the square of the concentration of the halide.
What is employed?
A person who is employed either has a job or is engaged in something. Some individuals think that teenagers with employment are less likely to get into trouble than those without work. You are employed if you are working. The majority of persons who are working hold traditional full-time occupations, however an increasing proportion also work as independent contractors or in part-time jobs. This adverb can also be used to denote "used," as in the sentence "The used tactics for maintaining the classroom's quiet seem a touch extreme to me." The word employ, which means to "use, apply, occupy, or hire," is whence the adjective employed originates.
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