Nuclear magnetic resonance spectra of 2-pyrazolines

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Abstract
The nuclear magnetic resonance spectral parameters for a series of 3-carbomethoxy-2-pyrazolines are presented and discussed. Substitution of a phenyl group at position-5 has a large effect on the relative chemical shift of the two protons at position-4, although a carbomethoxy group at position-5 has little effect. The cis and trans vicinal coupling constants in compounds with two protons in position-4 are nearly equal and differ from the values found when there is a substituent in position-4. The presence of three groups in positions-4 and -5 appears to hold the ring in a rigid conformation. The line width for the hydrogen attached to nitrogen depends upon the number of phenyl groups in position-5.

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