number of proton signals of 1H NMR spectrum for tetrahydrofuran and multiplicity of downfield signal and upfie?

The structure of THF (tetrahydrofuran) is given below.

A) How many proton signals will appear on the 1H NMR spectrum?

B) What will the multiplicity of the downfield signal of the 1H NMR spectrum be?

C) What will the multiplicity of the upfield signal of the 1H NMR spectrum be?

D) How many C-13 signals will appear on the 13C NMR spectrum?

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  • Cubbi
    Lv 7
    10 years ago
    Favorite Answer

    Sounds like someone chose the wrong compound to give students as homework!

    There are two groups of chemically equivalent protons, of course. One at 3.7ppm and one at 1.8ppm, but because there is no free rotation around any of the C-C or C-O bonds, they are not magnetically equivalent. In the first order approximation (vicinal couplings only), the group at 3.7 ppm can have up to 16 peaks and the group at 1.8 ppm can have up to 64 peaks (in reality there's probably half of that due to symmetry, but if you count four-bond couplings, which can easily be over 1Hz here, then there's a lot more peaks to find). Everybody's favorite public database AIST SDBS doesn't have a well-resolved spectrum of THF, but in their 2-methyl THF, the 1.8ppm multiplet has 52 visible peaks!

    Only (D) is a simple question :) two signals, one at 68ppm, one at 26ppm.

  • 4 years ago

    This Site Might Help You.

    RE:

    number of proton signals of 1H NMR spectrum for tetrahydrofuran and multiplicity of downfield signal and upfie?

    The structure of THF (tetrahydrofuran) is given below.

    A) How many proton signals will appear on the 1H NMR spectrum?

    B) What will the multiplicity of the downfield signal of the 1H NMR spectrum be?

    C) What will the multiplicity of the upfield signal of the 1H NMR spectrum be?

    D) How many C-13...

    Source(s): number proton signals 1h nmr spectrum tetrahydrofuran multiplicity downfield signal upfie: https://shortly.im/T6nmE
  • 3 years ago

    Multiplicity Nmr

  • 3 years ago

    Nmr Multiplicity

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  • 10 years ago

    A) 2 there are 2 chemically equivalent groups of hydrogens

    B) the multplicity of the the downfield signal will be triplet, if you look at the molecule there will be only 2 hydrogens within reach of the more deshielded (and therefore downfield) hydrogens.

    C) Not sure about this one

    D) 2 there are 2 distinct chemically equivalent groups of carbons.

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