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ÎÄÏ×1£º The products of the isomerization were determined by 1H NMR spectroscopy. The conversion of IPP to DMAPP was confirmed by the
appearance of peaks at 5.45 (H at C-2), 1.77 (E-methyl group), and 1.72 ppm (Z-methyl group) for IPP and a corresponding reduction in the
intensity of peaks at 2.40 (H at C-2) and 1.78 ppm (methyl group) (35). Peaks for the protons at C-1 of both diphosphates and the C-4
olefinic protons in IPP were obscured.
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