| 摘要 |
The cycloaliphatic aldehydes of formula <IMAGE> (I) wherein R0, R1 and R2 represent independently a hydrogen atom or a lower alkyl from C1 to C6 and X stands for a group of formula <IMAGE> wherein R3 and R4 represent independenly a lower alkyl radical from C1 to C3 and R5 represents a lower alkyl radical or hydrogen, provided that R1, R3 and R4 do not represent simulataneously a methyl radical whenever R0 and R2 represent each a hydrogen atom, are prepared from enol esters of formula <IMAGE> (II) wherein the wavy line stands for a -C-O- bond of cis or trans configuration, Y represents an acyl group or P(O)(OR)2, wherein R stands for a lower alkyl monovalent radical or an aryl, and Z defines a group of formula <IMAGE> wherein R3, R4 and R5 are defined as above, by cyclisation carried out by means of an acidic cyclisation agent.
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