The purpose of the experiment was to produce Benzhydrol through a reduction reac

Question

The purpose of the experiment was to produce Benzhydrol through a reduction reaction of benzophenone and sodium borohydride.

The IR spectra of the benzhydrol was obtained.

1.Compare the infrared spectra of the produced benzhydrol with a literature source. Note the differences.

2112.1 22 3.588 1083.714 7.754 1.099 0.103 2320.828 0 958.515 1.018 1893.071 70.484 22.076 113,644 15.48 3261.449 -0.003 1446440 11467 491.442 22.486 1014.287 3800 36003400 3200 3000 280o 2000 2400 22002000 180016001400 1200 1000 8 Wavenumber Name

Explanation / Answer

Solution :-

1) benzophenone contains the carbonyl group therefore it shows the IR peak at the 1730 cm-1 which is the characteristic peak for the carbonyl group

The product Benzhydrol contains the OH group the C=O of the reactant is converted to the OH therefore the 1730 cm-1 is disappeared

So the IR spectrum given for the benxhydrol is matches with the literature spectra since it do not contain any peak at about 1700 cm-1 means all the reactant is converted into the product.

2) If the all the reactant is not converted into the benzhydrol then the mixture contains the product and reactant both molecules

So in the IR spectrum it will show both frequencies for the OH grouo and C=O groups

So it can shows the peak at about 1730 cm-1 which is form the C=O group of the reactant.

so the peak at 1730 cm-1 can be shown to indicate the reactant C=O group frequency.

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