The present invention relates to a method for preparing cyclohexene derivatives of the general formulae I or II
by reducing alkyne compounds of the general formulae III or IV
with a mixture of zinc and at least one ammonium salt of the formula V as reducing agent,
in which the substituents R
1
to R
8
have independently of one another the meaning specified in the description, wherein the reducing agent comprises from 0.3 to 0.49 mol of at least one ammonium salt of the formula V per mol of zinc.
Weyerstahl, Peter; Meisel, Thomas; Mewes, Klaus, Liebigs Annalen der Chemie, 1991, p. 19 - 25