The Absence of Second-Order Effects at Higher Field

The Absence of Second-Order Effects at Higher Field 

FIGURE 5.38 A nearly first-order A2X2 pattern in the proton spectrum of 2-chloroethanol at 300 MHz. 

With routine access to NMR spectrometers with H operating frequencies 300 MHz, chemists today encounter fewer second-order spectra than in years past, hi Sections 5.17 and 5.18, you saw 

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FIGURE 7.44 The splitting patterns of a four-proton system —CH2—CH2— for various Av/J values. 

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