Method for producing trimethylol alkanes

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 29/14 (2006.01) C07C 31/22 (2006.01) C07C 45/75 (2006.01) C07C 47/19 (2006.01)

Patent

CA 2396947

The invention relates to a two-step method for producing trimethylol alkanes of the general formula (I), (HOCH2)3-C-R, wherein R represents methylol, C1- C12 alkyl, C6-C10 aryl or C7-C22 aralkyl, and simultaneously producing calcium formiate on the basis of an aldehyde of the formula (II), RCH2CHO, wherein R has the meaning indicated above. In a first step, an aldehyde of the formula (II) and a formaldehyde are reacted in the presence of a base to give a 2,2- dimethylol alkanal of formula (III), wherein R has the meaning indicated above. In a second step, the compound of formula (III) is reacted with formaldehyde in the presence of calcium hydroxide. The invention provides a method for obtaining trimethylol alkanes of the general formula (I) with a high purity and in high yields.

La présente invention concerne un procédé en deux étapes servant à préparer des triméthylolalcanes de formule générale (I), (HOCH¿2?)¿3?-C-R, dans laquelle R est méthylol, alkyle C¿1?-C¿12?, aryle C¿6?-C¿10? ou aralkyle C¿7?-C¿22?, avec la formation concourante de formiate de calcium à partir d'un aldhéhyde de formule (II), RCH¿2?CHO, dans laquelle R correspond aux éléments mentionnés ci-dessus. Dans une première étape, un aldhéhyde de formule (II) et un formaldéhyde en présence d'une base, sont convertis en un 2,2-diméthylolalcanal de formule (III) dans laquelle R correspond aux éléments mentionnés ci-dessus. Dans une seconde étape, on fait réagir le composé de formule (III) avec du formaldéhyde en présence d'hydroxyde de calcium. Ce procédé permet d'obtenir des triméthylolalcanes de formule générale (I) d'une grande pureté, avec un rendement élevé.

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