Splitting pattern

More complicated splitting patterns conform to an extension of the n + 1 rule and will be discussed in Section 13 11... 

Table 13 2 summarizes the splitting patterns and peak intensities expected for cou pling to various numbers of protons... 

We often see splitting patterns in which the intensities of the individual peaks do not match those given in Table 13 2 but are distorted in that the signals for coupled protons lean toward each other This leaning is a general phenomenon but is most easily illus trated for the case of two nonequivalent vicinal protons as shown m Figure 13 18... 

FIGURE 13 18 The appear ance of the splitting pattern of two coupled protons de pends on their coupling con stant d and the chemical shift difference Av between them As the ratio Av/d de creases the doublets be come increasingly distorted When the two protons have the same chemical shift no splitting IS observed... 

Figure 13 20 there are two other vinylic protons Assuming that the coupling constant between the two geminal protons in ArCH=CH2 is 2 Hz and the vicinal coupling constants are 12 Hz (cis) and 16 Hz (trans) describe the splitting pattern for each of these other two vinylic hydrogens... 

Splitting pattern which gives information about the number of protons that are within two or three bonds of the one giving the signal... 

Section 13 11 Complicated splitting patterns can result when a proton is unequally cou pled to two or more protons that are different from one another... 

The c/s-fused diaziridines (31a) and (31b) are also an equilibrium system, interchanging exo and endo positions of methyl and ethyl groups. The NMR spectrum shows two methyl peaks at 0 °C, coalescing to a single sharp peak at 75 °C. The ethyl group shows the sharp characteristic quartet-triplet splitting pattern at 75 °C (74JOC3187). 

Fluorine spectra of two fluoroethylenes, both from the Japan Halon compilation [19], are shown m Figures 4 and 5. The splitting pattern of fluoroethene (doublet of doublets of doublets) is clarified by using a branching display above the peaks, from which coupling constants can be measured easily. The AA XX spectrum of 1,1-difluoroethene is also shown. 

Two features that aie fundfflnental to H NMR spectroscopy—integrated areas and splitting patterns—aie not very important in NMR. 

The next low field signal of one proton at 3.73 p.p.m. can be assigned to a proton at C-5 connected to the ether linkage and the splitting pattern of the signal can be explained by the coupling with three... 

Predict the splitting patterns you would expect for each proton in the following molecules ... 

More Complex Spin-Spin Splitting Patterns 465... 

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