2h aromatic protons 7 66 7 32 m 7h six aromatic protons and the cooh proton which exchanges with d 2 o 13 c nmr 75 mhz acetone d 6 u03b4 172 0 163 1 162 8 131 5 130 0 129 1 129 1 128 9 128 8 128 5 127 3 108 8 gc ms 70 ev m z rel int 221 m u2212 44 55 146 13 144 25 142 15 133 10 132 33 105 100 103 11 91 17 89 22 77 39 50 19 44 28 41 19 anal calc for c 16 h 11 no 3 c 72 44 h 4 18 n 5 28 found c 72 46 h 4 17 n 5 30 according to the invention the following compounds were also synthesised prepared according to the examples listed below also as a non limiting example synthesis was carried out using in sequence the two general procedures already described yellow crystals are obtained with a 60 yield m p 71 73 u00b0 c ft ir kbr 3147 3051 2927 2848 1633 1520 1435 1412 1236 1204 1134 1020 985 940 926 897 796 775 704 cm u2212 1 1 h nmr cdcl 3 u03b4 2 36 s 3h 6 11 6 12 d 1h j 3 57 hz 6 25 6 27 d 1h j 3 57 hz 7 25 7 30 m 2h aromatic protons 7 40 7 47 m 3h aromatic protons 13 c nmr 75 mhz cdcl 3 u03b4 11 4 108 1 113 9 115 0 128 6 129 0.