4.2.5. 2-[Carboxy(4-fluorophenyl)methyl]benzoic Acid (**10e**)

Prepared according to the general procedure GP1 from 3-(4-fluorophenyl)-2,3-dihydro-1*H*-inden-1-one [16]. Yield 0.789 g, 30%. Colorless amorphous solid. 1H NMR (400 MHz, DMSO-*d*6) *δ* 12.88 (s, 2H), 7.94–7.83 (m, 1H), 7.53–7.45 (m, 1H), 7.40–7.33 (m, 1H), 7.31–7.25 (m, 2H), 7.23–7.09 (m, 3H), 6.06–5.94 (m, 1H). 13C NMR (101 MHz, DMSO-*d*6) *δ* 173.8, 169.1, 161.6 (d, *J* = 243.3 Hz), 140.4, 135.7 (d, *J* = 3.1 Hz), 132.2, 131.4 (d, *J* = 8.1 Hz), 131.1, 130.8, 130.1, 127.4, 115.7 (d, *<sup>J</sup>* = 21.3 Hz), 52.8. 19F NMR (376 MHz, DMSO-*d*6) *<sup>δ</sup>* −115.9. HRMS (ESI/Q-TOF) *m*/*z*: [M + Na+] <sup>+</sup> Calcd for C15H11FO4Na<sup>+</sup> 297.0534; Found 297.0528.
