†Selected data for 2: FAB-MS (M+) 324.18850 C19H29O2Cl requires 324.18559; 1H NMR (60 MHz, CDCl3) 1.3 (s, 9H, p-t-but), 1.4 (s, 18H, 2xo-t-but), 7.4 (s, 2H, 2xm-H); 13C NMR (90.5 MHz, CDCl3) 150.8 (C=O), 148.6 (O-C1), 146.9(C4), 140.7 (C2), 123.6 (C3-H), 35.4 (o-quat. C), 34.8 (p-quat. C), 31.4 (o and p-tert-butyl CH3); FT-IR max 1787 (C=O), 1117 (C-O) cm¯¹.