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Abstract

The present invention relates to a process for preparing a metal-free, alkoxide-pure alkaline-earth alkoxide of the general formula I M(OR.sup.1).sub.2 (I) in which M stands for an element pertaining to the second Main Group of the Periodic Table of the Elements and R.sup.1 represents a linear, branched or cyclic alkyl group with 2 to 20 C atoms, by alcoholysis of a compound of the general formula II M(OR.sup.2).sub.x(OR.sup.3).sub.y(OR.sup.4).sub.z (II) in which M stands for an element pertaining to the second Main Group of the Periodic Table of the Elements, groups R.sup.2, R.sup.3 and R.sup.4 are the same or different and represent a linear alkyl group with 1 to 4 C atoms, with the proviso 0.ltoreq.x.ltoreq.2, 0.ltoreq.y.ltoreq.2, 0.ltoreq.z.ltoreq.2 with (x+y+z)=2, with an alcohol, which is employed in excess, of the general formula III HOR.sup.1 (III) in which R.sup.1 has the same significance as in formula I, is different from groups R.sup.2, R.sup.3 and R.sup.4 according to formula II, and in the alkyl chain possesses at least one C atom more than the longest alkyl group from the series R.sup.2, R.sup.3 and R.sup.4, the compounds of the formula I and/or of the formula II being kept dissolved, at least in a proportion, during the conversion.

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First Claim