“…The residue was stirred in diethyl ether and the solvent removed under vacuum to give the product as a white solid (0.91 g, 94% yield). 1 H NMR (300 MHz, CDCl 3 ): δ 1.32 (m, 9H, OCH 2 CH 3 ), 3.32 (d (J = 13), 2H, CCH 2 C), 3.35 (d (J = 13), 4H, CCH 2 C) and 6.48-7.14 (m, 12H, ArH) Microanalysis: C 42 H 44 O 12 ؒ0.5H 2 O requires C 67.28, H 6.05%; found C 67.39, H 5.93%, [4]arene 3. Compound 2 (1.00 g, 1.35 mmol) was refluxed in oxalyl chloride for 2 hours.…”