The two methyl groups give one six-proton NMR doublet centred at ppm. The methine gives a one-proton NMR septet centred near ppm. The latter is split by six equivalent methyl protons, producing the first-order intensity pattern.
(1)
This follows exactly from the methyl doublet spacing, , and approximately from the successive septet spacings, which alternate between and ppm within the precision of the printed labels. There is no methylene triplet or quartet: the six-proton integral and septet establish the branched skeleton.
Figure 1.
Independent original carbon and proton assignments for B; both equivalent methyl groups couple to the methine
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