| 摘要 |
NEW MATERIAL:A compound shown by the formulaI(R<1> and R<2> are H, lower alkyl, or lower alkenyl; R<3> and R<4> are lower alkyl or lower alkenyl). EXAMPLE:1,4-Dimethyl-2,5-dithia-7-oxa-bicyclo[2,2,1]heptane. USE:An imparter for providing prolonged flavor and fragrance or modifier. Useful for foods and drinks, cosmetics, healthy or hygienic products, drugs, etc. PROCESS:For example, a 1,4-dialkyl or 1,3,4,6-tetralkyl-1,4-dihydroxy-2,5-dithian shown by the formula II is dehydrated optionally in the coexistence of an organic solvent in the presence of an acid catalyst. |
