| 摘要 |
There are disclosed new 4-spiro-oxirane derivatives of substituted piperidine having the general formula: <IMAGE> wherein R1, R2, R3, R4, either like or unlike one another, are each an alkyl radical having 1 to 4 C, or R1 and R2, and/or R3 and R4 together form a cyclo-alkylene radical having 3 to 13 C; R5 may be hydrogen, an alkyl, oxyalkyl or alkoxy radical having 1 to 6 C, an aryl or aryl-alkyl radical having 6 to 18 C, an alkenyl radical having 2 to 6 or a -(CH2)XCO2R7 radical in which X is an integer from 0 to 12, R7=H, metal, an alkyl, alkylene, alkenyl, alkenylene radical having 1 to 20 C and R6 is hydrogen or an alkyl radical containing 1 to 4 C.
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