Process for preparing octanediols

C - Chemistry – Metallurgy – 07 – C

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C07C 33/02 (2006.01) C07C 29/36 (2006.01) C07C 29/46 (2006.01)

Patent

CA 2148720

A method comprising a hydrodimerising reaction of 1,3-butadiene with water in the presence of a transition metal in the form of a metal or compound thereof, a tertiary or quaternary water-soluble phosphorus compound and at least a nitrogen compound, characterized in that the nitrogen compound is chosen from tertiary amine and a quaternary ammonium salt of general formula (I) or (II), wherein each of Rp, Rq and, if required Rs, which are the same or different, is a methyl or ethyl group, group Rr is C6-22 alkyl, group X<-> is a counter anion chosen from HCO3<->, CO3<2->, HSO3<->, SO3<2->, SiO3<2->, PO4<3->, HPO3<2->, AsO4<3->, SO4<2->, HSO4<->, RSO3<->, RCO2<->, OH<->, and R is an alkyl group; and in that said reaction is carried out in the presence of carbon dioxide.

2148720 9418147 Ce procédé, comportant la réaction d'hydrodimérisation du 1,3-butadiène avec de l'eau en présence d'un métal de transition sous forme métallique ou sous forme d'un composé dudit métal, d'un composé phosphoré tertiaire ou quaternaire soluble dans l'eau et au moins d'un composé azoté, se caractérise en ce que le composé azoté est choisi parmi une amine tertiaire et un sel d'ammonium quaternaire de formule générale (I) ou (II), dans lesquelles Rp, Rq, et le cas échéant Rs, sont identiques ou différents et représentent chacun un groupe méthyle ou éthyle, le groupe Rr représentant un alkyle comprenant de 6 à 22 atomes de carbone, le groupe X- représentant un contre-anion choisi parmi HCO3-, CO32-, HSO3-, SO32-, SiO32-, PO43-, HPO32-, AsO43-, SO42-, HSO4-, RSO3-, RCO2-, OH-, R étant un groupe alkyle, et en ce que l'on opère ladite réaction en présence de dioxyde de carbone.

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