available at iff formamidine acetate 1030 g 10 0 mol and butanol 1 2 l the reaction mixture was heated to 118 u00b0 c for 4 hours and then cooled to 25 u00b0 c the reaction mixture was washed twice with brine 1 l and purified by vacuum distillation to afford 6 7 8 9 tetrahydro 7 7 8 9 9 pentamethyl 5h cyclopenta h quinazoline 260 g having a boiling point of 140 u00b0 c at a pressure of 1 6 mmhg further recrystallization from ethanol afforded a solid with a melting point of 80 0 u00b0 c 1 h nmr cdcl 3 500 mhz 8 90 ppm s 1h 8 31 ppm s 1h 2 77 2 82 ppm m 2h 2 35 2 41 ppm m 1h 2 25 2 32 ppm m 1h 1 74 ppm q 1h j 7 37 hz 1 38 ppm s 3h 1 23 ppm s 3h 1 11 ppm s 3h 0 95 ppm d 3h j 7 40 hz 0 93 ppm s 3h the compound was described as having musky ambery and powdery notes dihydrocashmeran was obtained via the hydrogenation of cashmeran u2122 a 3 l reaction vessel was charged with dihydrocashmeran.