“…2-[(3-Oxocyclohex-1-en-1-yl)ethynyl]benzaldehyde (7ab). Chromatography (EtOAc/hexanes = 1:5); yellow solid; 413 mg; yield 92%; mp 59−60 °C; IR (neat) ν: 3065,2948,2743,2202,1697,1671,1590,1190, 765 cm −1 ; 1 H NMR (400 MHz, CDCl 3 ): δ 10.41 (s, 1H), 7.87 (d,J = 7.8 Hz,1H),2H),1H),6.27 (t,J = 1.6 Hz,1H), 2.53 (dt, J = 6.1, 1.6 Hz, 2H), 2.41 (t, J = 6.8 Hz, 2H), 2.07−2.01 (m, 2H); 13 C{ 1 H} NMR (100 MHz,CDCl 3 ): δ 198.4,190.9,142.1,136.0,133.9,133.5,133.3,129.8,127.8,125.0,94.6,94.5,37.3,30.2,22.6; MS (EI) m/z (% base peak): 224 (M + , 67), 206 (11), 196 (28), 181 (21), 168 (100), 167 (31), 139 (71), 126 (9), 89 (5); HRMS (EI-TOF) m/z: [M] + calcd for C 15 H 12 O 2 , 224.0837; found, 224.0834.…”