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1H NMR (CDCl3, 500 MHz) δ 3.87 (s, 6H), 6.83–6.87 (m, 2H),
7.16–7.18 (m, 2H), 7.22–7.25 (m, 2H), 7.29 (s, 2H), 7.31 (t, 3J
= 7.9 Hz, 2H); 13C NMR (CDCl3, 125 MHz) δ 55.5 (CH3),
111.4 (CH), 113.2 (CH), 118.4 (CH), 124.3 (CH), 130.1 (CH),
135.7 (Cquat), 143.6 (Cquat), 160.1 (Cquat); EIMS m/z (%): 297
(22), 296 ([M]+, 100), 253 (27), 210 (16), 148 (15); UV–vis
(CH2Cl2), λmax [nm] (ε): 331 (36700); IR (KBr), (cm−1):
3008 (w), 2960 (w), 2924 (w), 2852 (w), 2833 (w), 1776 (w),
1593 (m), 1581 (m), 1473 (m), 1458 (m), 1436 (m), 1423 (m),
1334 (w), 1319 (m), 1286 (m), 1255 (m), 1197 (m), 1176 (m),
1159 (m), 1120 (m), 1033 (s), 975 (m), 839 (m), 804 (s), 786
(s), 775 (s), 723 (m), 678 (s), 624 (m); Anal. calcd for
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Acknowledgements
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The financial support of this work by the Fonds der Che-
mischen Industrie is gratefully acknowledged. The authors also
thank the BASF SE and Merck Serono for the generous dona-
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