“…Yield (50%), yellow oil., Rf = 0.19 (cyclohexane/AcOEt 3:7). 1 H NMR (300 MHz,CDCl 3 ) δ7.67-6.90 (AA 0 BB 0 , J AA 0 BB 0 = 9 Hz, 4H, H arom ), 6 3-(4-Chlorophenyl)-5-((((3aR,5R,5aS,8aS,8bR)-2,2,7,7tetramethyltetrahydro-3aH-bis([1,3]dioxolo)[4,5-b:4 0 ,5 0 -d] pyran-5-yl)…”