“…). 6 The reaction procedure was as described above. 2-Methyl-1-cyclohexene carboxaldehyde 5b (3b) (0.9 g, 7.3 mmol) was allowed to react with (1-cyclohexenylmethylidene)triphenylphosphorane to give trans-2-(1-cyclohexenyl)-1-(2-methyl-1-cyclohexenyl)ethene (0.8 g, 55%): IR νmax 2950, 1643, 1468, 1459, 1144, 961 cm -1 ; 1 H NMR δ 1.63 (m, 8H), 1.77 (s, 3H), 2.14 (m, 8H), 5.76 (m, 1H), 6.19, 6.61 (AB quartet, 2H, J ) 16 Hz); 13 C NMR δ 19.4,22.6,22.7,22.9,23.0,24.6,25.5,26.1,33.1,123.6,127.9,128.6,129.0,132.7,136.4;MS m/z 202,187,159,145 (base),131,117,91,77;UV λmax ( ) 268 (34 310),278 (42 100),289 (31 750).…”