1158 G. Trapani, A. Latrofa, A. Reho, M. Franco and G. Liso Vol. 29 enol form were detected]; ms: m/z = 303 (M*, 22), 165 (100). Anal. Caled, for C„H21N02S: С, 67.31; H, 6.98; N, 4.62. Found: С, 67.55; H, 7.16; N, 4.82. A/-Cycloheptyl-2-acetylmethylidene-2,3-dihydro-l,3 -benzothiazole (12d). This compound was obtained as a solid (96% yield), mp 100-101°; ir (potassium bromide): v max = 1610 cm'1; 'H nmr (deuteriochloroform): 5 1.5-2.6 (m, 12H), 2.23 (s, ...