cyclopropane low high resolution H-1 proton nmr spectrum of analysis interpretation of chemical shifts ppm spin spin line splitting H1 cyclopropane 1-H nmr doc brown's advanced organic chemistry revision notes

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Advanced Organic Chemistry: H-1 NMR spectrum of cyclopropane

The H-1 hydrogen-1 (proton) NMR spectrum of cyclopropane

Doc Brown's Chemistry Advanced Level Pre-University Chemistry Revision Study Notes for UK IB KS5 A/AS GCE advanced A level organic chemistry students US K12 grade 11 grade 12 organic chemistry courses involving molecular spectroscopy analysing H-1 NMR spectra of cyclopropane

low and high resolution H-1 proton nmr spectrum of cyclopropane analysis interpretation of chemical shifts ppm spin spin line splitting diagram H1 1-H nmr for cyclopropane doc brown's advanced organic chemistry revision notes

TMS is the acronym for tetramethylsilane, formula Si(CH₃)₄, whose protons are arbitrarily given a chemical shift of 0.0 ppm. This is the 'standard' in ¹H NMR spectroscopy and all other proton shifts, called chemical shifts, depend on the individual (electronic) chemical environment of the hydrogen atoms in an organic molecule - cyclopropane here.

The chemical shifts quoted in ppm on the diagram of the H-1 NMR spectrum of cyclopropane represent the peaks of the intensity of the chemical shifts of (which are often groups of split lines at high resolution) AND the relative integrated areas under the peaks gives you the ratio of protons in the different chemical environments of the cyclopropane molecule.

Cyclopropane C₃H₆, ,

Interpreting the H-1 NMR spectrum of cyclopropane

All eight hydrogen atoms are equivalent as cyclopropane is a highly symmetrical molecule, the three carbon atoms are in the same plane.

Therefore only one ¹H Chemical shift is observed.

Number of protons ¹H causing splitting	Splitting pattern produced from the n+1 rule and the theoretical ratio of line intensities
0 means no splitting							1
1 creates a doublet						1		1
2 creates a triplet					1		2		1
3 creates a quartet				1		3		3		1
4 creates a quintet			1		4		6		4		1
5 creates a sextet		1		5		10		10		5		1
6 creates a septet	1		6		15		20		15		6		1

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