Process for producing alkoxybutenes

C - Chemistry – Metallurgy – 07 – C

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C07C 41/00 (2006.01) C07C 41/06 (2006.01) C07C 43/00 (2006.01)

Patent

CA 2265591

In a process for producing alkoxybutenes, 1,3-butadiene or a butadiene- containing hydrocarbon mixture is reacted with an alcohol of formula ROH (I) at an increased temperature and pressure in the presence of a Brönsted acid, yielding a mixture of addition products of formulas (II) and (III), in which the radical R is a C2-C20 alkyl, alkenyl, cycloalkyl or cycloalkenyl group substituted or not with 1 to 2 C1-C10 alkoxy or hydroxy groups, or is a C2-C10 aryl or C7-C11 aralkyl group or a methyl group. The disclosed improvement consists in that the reaction is carried out in the presence of water.

L'invention concerne un procédé pour la préparation d'alcoxybutènes, dans lequel on fait réagir du 1,3-butadiène ou bien un mélange d'hydrocarbures contenant du butadiène avec un alcool de la formule (I): ROH, à température et pression élevées, en présence d'un acide de Brönsted pour former un mélange des produits d'addition des formules (II) et (III) dans lesquelles le reste R est un groupe alkyle C¿2?-C¿20?, alcényle, cycloalkyle ou cycloalcényle non substitué ou substitué avec 1 à 2 groupes alcoxy C¿1?-C¿10? ou hydroxy, ou bien un groupe aryle C¿2?-C¿10? ou un groupe aralkyle C¿8?-C¿11? ou encore le groupe méthyle, le perfectionnement consistant en ce que l'on effectue la réaction en présence d'eau.

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