| 摘要 |
Cyclohexene derivatives with a penta-1,3- or -1,4-dienyl substituent group are produced by reduction of corresponding penta-3-en-1-ynyl or penta-4-en-1-ynyl compounds using, as reducing agent, a mixture of zinc and ammonium, copper, alkali metal and/or alkaline earth metal salts. An Independent claim is also included for a method for the production of cyclohexene derivatives of formula (I) or (II) by reduction of alkynes of formula (III) or (IV) using, as reducing agent, a mixture of zinc and at least one compound (B) selected from ammonium salts, copper salts, alkali metal salts and alkaline earth metal salts. R<1> = a group of formula R1a, R1b, R1c or R1d; R<2> = OH or a protecting group which can be hydrolysed to OH; R<3>, R<4> = H or 1-4C alkyl; and R<5> = H or 1-4C acyl.
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