| 摘要 |
Pyran derivatives of general formula (I) wherein Y is a 5-, 6- or 7-membered ring, preferably a 5- membered ring, methyl or ethyl mono- or polysubstituted, and optionally unsaturated, and R1, R2, R3, R4 are, each independently, a hydrogen atom or a linear or branched C<SUB>1-5</SUB> alkyl or C<SUB>2-5</SUB> alkenyl group, and X is present or absent; when X is present, R5, R6, R7, R8, R9 are all present, and X is a hydrogen atom or an OZ group, wherein Z is a hydrogen atom or a R10 group or a C(O)R10 group; when X is absent, a double bond involving the carbon atom at the 4 position is present and R7, R8 and R9 are present, and one of R5 or R6 is present and the other one is absent, or R5, R6, and R7 are present, and one of R8 or R9 is present and the other one is absent, or R7 is a =C (R11) (R12) group and R5, R6, R8, R9 are present; and when they are present, each of R5-R12 group is, independently, a hydrogen atom or a linear or branched C<SUB>1-5</SUB> alkyl or C<SUB>2-5</SUB> alkenyl group; and use of at least one pyran derivative of formula (I) as flavouring or fragrant agent. |
