Organic compounds -- part of the class 532-570 series – Organic compounds – Nitriles
Patent
1995-04-26
1997-11-18
Richter, Johann
Organic compounds -- part of the class 532-570 series
Organic compounds
Nitriles
558337, C07C25330
Patent
active
056889860
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to processes and catalyst compositions useful in the hydrocyanation of monoolefins. In particular, the invention relates to the hydrocyanation of monoolefins using zero-valent nickel and a bidentate phosphite ligand in the presence of a Lewis acid promoter.
BACKGROUND OF THE INVENTION
Hydrocyanation catalyst systems, particularly pertaining to the hydrocyanation of olefins, are known in the art. For example, systems useful for the hydrocyanation of butadiene to form pentenenitrile and in the subsequent hydrocyanation of pentenenitrile (PN) to form adiponitrile (ADN), are known in the commercially important nylon synthesis field. The hydrocyanation of olefins using transition metal complexes with monodentate phosphite ligand is documented in the prior art. See for example; U.S. Pat. Nos. 3,496,215, 3,631,191, 3,655,723 and 3,766,237, and Tolman, C. A.; McKinney, R. J.; Seidel, W. C.; Druliner, J. D.; and Stevens, W. R.; Advances in Catalysis, 33, 1, 1985.
The hydrocyanation of activated olefins such as with conjugated olefins (e.g., butadiene and styrene) and strained olefins (e.g., norbornene) proceeds without the use of a Lewis acid promoter, while hydrocyanation of unactivated olefins such as 1-octene and 3-pentenenitrile requires the use of a Lewis acid promoter. Teachings regarding the use of a promoter in the hydrocyanation reaction appear, for example, in U.S. Pat. No. 3,496,217. This patent discloses an improvement in hydrocyanation using a promoter selected from a large number of metal cation compounds with a variety of anions as catalyst promoters.
U.S. Pat. No. 3,496,218 discloses a nickel hydrocyanation catalyst promoted with various boron-containing compounds, including triphenylboron and alkali metal borohydrides. U.S. Pat. No. 4,774,353 discloses a process for the preparation of dinitriles, including ADN, from unsaturated nitriles, including PN, in the presence of a zero-valent nickel catalyst and a triorganotin catalyst promoter. U.S. Pat. No. 4,874,884 discloses a process for producing ADN by the zero-valent nickel catalyzed hydrocyanation of pentenenitriles in the presence of a synergistic combination of promoters selected in accordance with the reaction kinetics of the ADN synthesis.
Bidentate phosphite ligands similar to those used in the present invention for the hydrocyanation of monoolefins have been shown to be useful ligands in the hydrocyanation of activated olefins. See, for example: Baker, M. J., and Pringle, P. G.; J. Chem. Soc., Chem. Commun., 1292, 1991; Baker, M. J.; Harrison, K. N.; Orpen, A. G.; Pringle, P. G.; and Shaw, G.; J. Chem. Soc.; Chem. Commun., 803, 1991, Union Carbide, WO 93,03839.
Also, some of the ligands of the present invention have been disclosed with rhodium in catalyst complexes useful for the hydroformylation of functionalized olefins; see, Cuny, G. D., Buchwald, S. L., J. Am. Chem. Soc. 1993, 115, 2066.
The present invention provides for novel processes and catalyst precursor compositions which are more rapid, selective, efficient and stable than current processes and catalyst complexes employed in the hydrocyanation of monoolefins. Other objects and advantages of the present invention will become apparent to those skilled in the art upon reference to the detailed description of the invention which hereinafter follows.
SUMMARY OF THE INVENTION
The present invention provides a process for hydrocyanation comprising reacting a nonconjugated acyclic aliphatic monoolefin, a monoolefin conjugated to an ester group, e.g., methyl pent-2-eneoate, or a monoolefin conjugated to a nitrile group, e.g., 3-pentenenitrile; with a source of HCN in the presence of a catalyst precursor composition comprising zero-valent nickel and a bidentate phosphite ligand of Formula I, ##STR1## wherein each R.sup.1 is independently a tertiary substituted hydrocarbon of up to 12 carbon atoms, or OR.sup.4 wherein R.sup.4 is C.sub.1 to C.sub.12 alkyl; 12 carbon atoms; organonitrile. Preferably, the reaction is carried out in the presence o
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Kreutzer Kristina Ann
McKinney Ronald James
Tam Wilson
Cross Laura R.
E. I. Du Pont de Nemours and Company
Richter Johann
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