1586
D. VILLEMIN ET AL.
31P NMR: 20.2. 13C NMR: 35.43 (d, 2JCP = 125.77, 2CH2-P), 127, 128.24, 130.5, 135.9.
IR: 3000–2850 (OH), 2200 (CHar), 1442 (δ CH2), 1160 (P=O), 1100 (νas P-OH), 930 (νs
P-OH).
para-Xylene-α,αꢀ-diphosphonic acid22 was obtained from α,αꢀ-dibromo-para-
xylene (20 mmol, 5.44 g) and triethyl phosphite (40 mmol, 6.9 mL) under MW irradiation
(170 W, 3 min). Crystallization in water/methanol (95:5) gave a yield of 55%. Mp
2
190◦C.22 1H NMR: 2.75 (t, JHP = 9.77, 2CH2-P), 7.20 (m, 4Har). 31P NMR: 17.8. 13C
2
NMR: 36.4 (d, JCP = 122.66, 2CH2-P), 127.75, 130.1, 137.1, 138.5. IR: 3000–2850
(OH), 2284 (CHar), 1422 (δ CH2), 1124 (P=O), 1037 (νas P-OH), 941(νs P-OH).
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