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grapesugar
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#1
Report Thread starter 15 years ago
#1
The esters C4H8O2, how many and what are the isomers of it? I can think of 3 but I need to know if there are more?!?!
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markkey
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#2
Report 15 years ago
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There are only 3 esters with the formula C4H8O2.

They are:
CH(O)OCH2CH2CH3
CH3C(O)OCH2CH3 &
CH3CH2C(O)OCH3
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grapesugar
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#3
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thanks
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grapesugar
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#4
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#4
hmm next part, is working out the difference between what the nmr spectrum would look like between ethyl ethanoate and propyl methanoate. im utterly confused, i see no difference. both have a 3:2:3 ratio, and both have a singlet, doublet, and a triplet with the same relative no. of protons?!
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charco
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#5
Report 15 years ago
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propyl ethanoate is CH3CH2COOCH3
ethyl ethanoate is CH3COOCH2CH3

so you are quite correct with your assessment of the splitting and the integrals - the only difference in 1H NMR can be in the relative shift of each group.
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markkey
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#6
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Included are the 1H-NMR predictions for both ethyl ethanoate and propyl methanoate.

The central hydrogens in the propyl part of proryl methanoate should be next to carbons which contain 2 and 3 hydrogens and so are next to 5 in total which should give 6 splitting peaks.
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grapesugar
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#7
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cool, thanks. solved my problem :-p
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The doct00r
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#8
Report 3 years ago
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2nd and third one are similar
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