Process for the continuous preparation of alkyl 5-formylvalerate compounds using homogeneous rhodium hydroformylation catalysts
AssigneesDsm N.V., E.I. duPont de Nemours and Company
InventorsOnko J. Gelling, Peter C. Borman
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Abstract
Process for the continuous preparation of an alkyl 5-formylvalerate by reacting an alkyl-3-pentenoate with carbon monoxide and hydrogen by hydroformylation using a catalyst system comprising rhodium or iridium and a multidentate organic phosphite ligand according to the general formula: in which n is 2-6, X is an n-valent organic bridging group, and in which the end groups R1-R2 are monovalent aryl groups, wherein the process is carried out in the presence of an acid compound having a pKa between 1 and 12 measured in water at 18° C.
Claims14
Process for the continuous preparation of an alkyl 5-formylvalerate by reacting an alkyl-3-pentenoate with carbon monoxide and hydrogen by hydroformylation using a catalyst system comprising rhodium and a multidentate organic phosphite ligand according to the formula:
- wherein n represents 2-6,
- X represents an n-valent organic bridging group, and
- R1 and R2 represent monovalent aryl groups, wherein the process is carried out in the presence of and acid compound having a pKa between 1 and 12 measured in water at 18° C., and wherein the alkyl group of said alkyl 5-formylvaleriate and alkyl-3-pentenoate comprised from 1 to 20 carbon atoms.
Dependencies are inferred from the claim text.