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US 6,171,997 B2Granted
Hydrocyanation of diolefins and isomerization of nonconjugated 2-aklyl-3-monoalkenenitriles
AssigneeE. I. Du Pont de Nemours and Company
InventorsThomas Foo, James Michael Garner, Wilson Tam
Life of this patent
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Abstract
Improved liquid phase process useful in the hydrocyanation of diolefinic compounds to produce nonconjugated acyclic nitriles and to the liquid phase process of isomerization of the nitriles to, among other things, 3- and/or 4-monoalkene linear nitriles. The improvement involves conducting the process in the presence of zero-valent nickel and a multidentate phosphite ligand.
Claims17
A multidentate phosphite ligand having the formula of:
- wherein
- each R1 is independently a H, halogen, primary or secondary or tertiary hydrocarbyl of 1 to 12 carbon atoms, OR3 wherein R3 is a C1 to C12 alkyl, or CO2R3′ wherein R3′ is a C1 to C12 alkyl, or aryl;
- each R2 and R2′ are independently a H, halogen, primary, secondary or tertiary hydrocarbyl of 1 to 12 carbon atoms, OR3 wherein R3 is a C1 to C12 alkyl, or CO2R3′ wherein R3′ is a C1 to C12 alkyl, or aryl;
- when R2′ is not hydrogen, R2′ cannot be ortho to the oxygen;
- each R5′ is independently a H, halogen, primary, secondary or tertiary hydrocarbyl of 1 to 12 carbon atoms, OR3 wherein R3 is a C1 to C12 alkyl, or CO2R3′ wherein R3′ is a C1 to C12 alkyl, or aryl;
- each R9 is independently H, halogen, primary, secondary or tertiary hydrocarbyl of 1 to 12 carbon atoms, OR3 wherein R3 is a C1 to C12 alkyl, or CO2R3′ wherein R3′ is a C1 to C12 alkyl, or aryl;
- and
- each X is independently O or CH(R4′), wherein R4′ is H, aryl, or a C1 to C12 alkyl.
5 more elements
Dependencies are inferred from the claim text.