“…Treatment of 6-methyl-5-hepten-2-one (5) as described above yielded 25 (90%) as a colorless oil: ir (film) 3030, 2960, 2930, 1600, 1495, 1450, 750, and 690 cm"1; nmr (60 MHz, CC14) 7.21 (5 H, apparent s), 5.30-4.92 (1 H, m), 2.69 (1 H, apparent q, J = 7 Hz), a broad singlet at 1.68 (3 H, s) superimposed on a broad multiplet at 2.15-1.58 (4 H, m), 1.51 (3 H, broad s), and 1.23 (3 H, d, J = 7 Hz); mass spectrum m/e (relative intensity) 188 (M+, 3-Phenyl-4(8)-p-menthene (26). Treatment of (+)-pulegone (6) as described above yielded 26 (85%) as a colorless oil: ir (film) 3070, 3035, 2925, 1603, 1490, 1450, and 690 cm"1; nmr (100 MHz, CDC13) 7.37-6.98 (5 H, m), 4.13-4.00 (0.3 H, m Ph-CH-, equatorial proton), 3.84-3.60 (0.7 H, m, Ph-Cfl-, axial proton), ca.…”