Research Article
3-Bromopyridine-Heterogenized Phosphotungstic Acid for Efficient Trimerization of Biomass-Derived 5-Hydroxymethylfurfural with 2-Methylfuran to C21 Fuel Precursor
Figure 10
1H and 13C NMR spectra of intermediate 1. Intermediate 1: 1H NMR (500 MHz, CDCl3) (, Hz, 1H), 6.05 (s, 1H), 6.04 (, Hz, 1H), 5.97 (, Hz, 2H), 5.89 (, Hz, 1H), 5.89 (, Hz, 1H), 5.40 (s, 1H), 4.55 (s, 2H), 2.25 (s, 6H). 13C NMR (126 MHz, CDCl3) , 152.85, 151.66, 150.24, 108.74, 108.05, 106.32, 57.68, 39.24, 13.67.