| 摘要 |
1530423 Preparation of theaspiran L GIVAUDAN & CIE SA 10 March 1976 [11 March 1975 30 Dec 1975] 27228/77 Divided out of 1530421 Heading C2C A process for the preparation of theaspiran, i.e. 2,6,10,10-tetramethyl-1-oxa-spiro (4,5-dec- 6-ene, of the formula comprises treating 4-(2,6,6-trimethyl-2-cyclohexen-1-ylidene)-butan-2-ol of the formula with an acid. The acid is preferably a protonic acid such as sulphuric, phosphoric or p-toluenesulphonic acid, or a Lewis acid, e.g. BF 3 , SnCl 4 or ZnCl 2 . The starting material is suitably obtained by the method described in Specification 1,530,422. The theaspiran may be converted into theaspirone having the formula by oxidation. Theaspiran and theaspirone possess flavour-imparting properties. |
