provide methods for preparing following compunds by the Grignard method:: Provides methods for preparing the followi…
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Question “provide methods for preparing following compunds by the Grignard method:: Provides methods for preparing the followi…”
provide methods for preparing following compunds by the Grignard
method::
Answer
Answer 1
Answer 2
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Grignards can be used to start with 1-bromoethane and then add Mg in any polar solvent that does not have H bonds. Usually, diethylether is used. Then you will have CH3CH2-+MgBr, which is your grignard. Now you will need to add propanal, which is CH3CH2-CHO. After attacking the carbonyl, the grignard will give you alcohol. You now have three pentanol.
To get 3-methyl-3 pentanol, repeat the process except that you add propanal. Next, add 2-butanone. Finally, acid is added. It is important to note that acidic protons cannot be produced in grignard reactions. Therefore, acid should only be added as a last step.
Propanal can be treated with ethylmagnesiumbromide, then dilute acids will give 3 pentanol. C2H5MgBr+ O=CH-C2H5 HTML5-CH(OH),-C2H5 2-methyl-3 pentanol will be produced by treating 2 -butanone using ethylmagnesiumbromide and then dilute the acid to produce 3-methyl pentanol. C2H5 HTML5 -C(CH3)-C(OH)(CH3)(OH-C2H5(CH3)(CH3)(CH3)(CH3)(OH5)-C2H5/C2H5-CH5)
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