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Home/ Questions/I need to compare the IR SPECTRA for benzophenone and triphenylmethanol. The image below is from...
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lyytutoriaExpert
Asked: April 13, 20222022-04-13T06:57:47+00:00 2022-04-13T06:57:47+00:00In: Chemistry

I need to compare the IR SPECTRA for benzophenone and triphenylmethanol. The image below is from…

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I need to compare the IR SPECTRA for benzophenone and triphenylmethanol. The image below is from the IR spectra of my product ( supposed triphenylmethanol) that i got at the experiment.

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I%20need%20to%20compare%20the%20IR%20SPECTRA%20for%20benzophenone%20and%20triphenylmethanol.%20The%20image%20below%20is%20from...

♦ Relevant knowledge

Triphenylmethanol is a crucial chemical compound that can be used as an reagent in chemical labs. The most important application of this reagent is in production of triarylmethane-based dyes. The compound can also be used as an anti-proliferative drug.

benzophenonetriphenylmethanol
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    Mary Evans
    2022-04-13T07:21:04+00:00Added an answer on April 13, 2022 at 7:21 am

    Below is the IR spectrum for benzophenone

    C=O at 1660 cm-1 is the main feature.

    I%20need%20to%20compare%20the%20IR%20SPECTRA%20for%20benzophenone%20and%20triphenylmethanol.%20The%20image%20below%20is%20from...

    Below is the IR spectrum for triphenylmethanol

    The O-H measuring 3470 cm-1 is the main feature.

    I%20need%20to%20compare%20the%20IR%20SPECTRA%20for%20benzophenone%20and%20triphenylmethanol.%20The%20image%20below%20is%20from...

    Due to the same structural unit in triphenylmethanol and benzophenone, other peaks are very similar in both spectra. These include the aryl C=H stretching at 3060cm-1, the C=C ring stretching between 1440-1600cm-1, and the C-H bending modes at below 1000cm-1.

    The IR spectrum of the precursor benzophenone, the alkyl-benzoate ester starting material (methyl oder ethyl) should be considered. Below is an example of the typical IR spectrum. The C=O stretching at 1726cm-1 is the main distinguishing feature.

    I%20need%20to%20compare%20the%20IR%20SPECTRA%20for%20benzophenone%20and%20triphenylmethanol.%20The%20image%20below%20is%20from...

    The IR spectrum of your product shows a large C=O stretching peak at 1750 cm-1. Although it is not as high as the C=O stretching in benzophenone (1660cm-1) but it is close to that of alkyl benzoate ester (1726cm-1). This indicates that your product contains significant amounts of unreacted alkylbenzate ester.

    Your product may also contain some benzophenone (C=O stretching peak of 1660 cm-1) and triphenylmethanol (3470 cm-1).

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