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3 (Me) HRMS (EI) : (Found : M +· , 512.1856, ); IR (ATR ,
(4H, m, ArH); 13 C NMR (CDCl 3 , 75 MHz, ppm) ? 193, Hz, J = 1.5 Hz, ArH), pp.60-67 ,
HRMS (EI) : (Found : M +· , 444.2553; C 33 H 32 O required 444.2443); IR (KBr, pp.31-34 ,
), 2. dichloromethane ? light petroleum (1:1 to 7:3) Mp (hexane) 222°C ; 1 H NMR (CDCl 3 , 500 MHz, ppm) ? 8.48 (2H, br d, 2008. ,
fluorene-9,11'-indeno[2,1-a]fluorene-12, p.1 ,
Tetrakis(4-tert-butylphenyl)dispiro[fluorene-9,6'-indeno, pp.3132-3144 ,
No 13 C has been recorded due to the very low solubility of 1g HRMS (ESI + ): (Found : M +· ,1306.8292; C 100 H 106 required 1306.8295); IR (ATR, cm -1 ) ?= 2962, Tetrakis, vol.173429, issue.187, pp.5-911 ,
116.4 (4F, s); ? max (THF)/nm 340, pp.1-12 ,
:98) The title compound 2f was obtained as a slightly yellow solid (yield: 18%) Mp 125°C, p.2 ,
35 (m, 10H; ArH), 3.60 ppm (s, 6H; Me), C NMR (75 MHz, CD 2 Cl 2 ): ?=168.9 (COOMe)CH), pp.7-5446 ,
1-a) IF (180 mg, 0.71 mmol) and chromium trioxide (495 mg, 4.95 mmol) were dissolved in acetic anhydride (60 mL) under an argon atmosphere. The solution was stirred for 20 h and poured into a solution of 10% HCl at 0°C and extracted with dichloromethane. The combined extracts were dried (MgSO 4 ), the solvent removed in vacuo and the residue purified by column chromatography on silica eluting with light petroleum The title compound was obtained as an orange solid, p.? ethyl acetate ,
16 (2H, s, ArH), 6.78 (2H, sd, J = 2.1, ArH), 6.72 (4H, sd, J = 1.8, ArH), 1.17 (36H, s, Me), 2H, dd, J = 8.1 J = 2.1, ArH) C NMR (CD 2 Cl 2 , 75 MHz, ppm) ? 151.5 (C), pp.50-57 ,
31.5 (Me);HRMS (ESI + ) : (Found : [M+Na] + , 957, pp.60-56, 2631. ,
1.16 (36H, s, Me); 13 C NMR (75 MHz, CD 2 Cl 2 ) ? 192, pp.150-157 ,
77 (4H, d, J= 1.4 Hz, 1H), 1.16 (36H, s, Me), C NMR (75 MHz, CD 2 Cl 2 ) ? 152, p.151 ,
cm -1 ) ? =3066, 1115. ,
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