| 摘要 |
Combustible compositions which contain as a flavorant additive substituted heterocyclic compound corresponding to the formula:
<CHEM>
wherein X is selected from pyrazine and pyridine radicals corresponding to the chemical structures:
<CHEM>
wherein R is a substituent selected from hydrogen and methyl, R<1> is a substituent selected from hydrogen and alkyl groups having 1 to 10 carbon atoms, R<2> is a substituent selected from aliphatic, alicyclic and aromatic groups having 1 to 12 carbon atoms, any heteroatom or atoms present in the R<2> group being oxygen or nitrogen, with the proviso that the radical
<CHEM>
may be an alicyclic structure.
<??>In one of its embodiments this invention provides tobacco compositions which contain up to 2% by weight of a substituted-pyrazine flavorant additive such as 2,3-dihydroxy-2,3- dimethyl-1,4-bis (3,5,6-trimethyl-2-pyrazinyl)butane:
<CHEM>
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