摘要:
4-Amino-3-chloro-6-(substituted)picolinates are prepared from difluoroacetic acid or trifluoroacetic acid, tritylamine or t-butylamine as a protecting group, a 3,3-dialkoxyprop-1-yne and a substituted methylene amine by a series of steps. Provided herein are processes for the preparation of 4-amino-5-fluoro-3-halo-6-(substituted)picolinates and 4-amino-3-halo-6-(substituted)picolinates. More particularly, provided herein are processes for the preparation of 4-amino-5-fluoro-3-halo-6-(substituted)picolinates and 4-amino-3-halo-6- (substituted)picolinates from a non-pyridine source. These picolinates are useful as herbicides.
摘要:
The present invention comprises synthetically useful processes in which an olefin undergoes an asymmetric reaction selected from the group consisting of hydroformylation, hydrocyanation, hydrocarboxylation and hydroesterification, in the presence of, as catalyst, a transition metal complex of an enantiomerically enriched chiral bis(phospholane) ligand.
摘要:
The present invention relates to a method comprising the step of contacting under hydroaminomethylation conditions, an olefin, an amine, a rhodium-phosphorous ligand, and synthesis gas (syngas). In particular, it has been discovered that, under some circumstances, a neutral rhodium-monodentate phosphite ligand is prescribed. The invention provides a simple way of making, in high yields and regiospecificity, a variety of products, including pharmacologically active products such as ibutilide, terfenadine, and fexofenadine, and derivatives thereof.
摘要:
This disclosure concerns methods for producing a high purity stearin comprising, for example, providing a sunflower oil comprising no more than about 4% total saturated fat and hydrogenating the sunflower oil. By way of further example, a method for producing a high purity tristearin may comprise providing sunflower oil comprising at least about 88% oleic acid and hydrogenating the sunflower oil. High purity stearin produced by methods, such as the foregoing, are also disclosed.
摘要:
4-Amino-5-fluoro-3-halo-6-(substituted)picolinates are conveniently prepared from 4,5,6-trichloropicolinates by a series of steps involving fluorine exchange, amination, halogen exchange, halogenation and transition metal assisted coupling.
摘要:
4-Amino-5-fluoro-3-halo-6-(substituted)picolinates are conveniently prepared from 4,5,6-trichloropicolinonitrile by a series of steps involving fluorine exchange, amination, halogen exchange, halogenation, nitrile hydrolysis, esterification, and transition metal assisted coupling.
摘要:
The present invention relates to compositions and processes of making catalysts and polyolefins. More particularly, the invention relates to snap shut catalysts, processes for making the catalysts, processes for making polyolefins using the catalysts and the polyolefins resulting therefrom.
摘要:
The present invention relates to a method comprising the step of contacting under hydroaminomethylation conditions, an olefin, an amine, a rhodium-phosphorous ligand, and synthesis gas (syngas). In particular, it has been discovered that, under some circumstances, a neutral rhodium-monodentate phosphite ligand is prescribed. The invention provides a simple way of making, in high yields and regiospecificity, a variety of products, including pharmacologically active products such as ibutilide, terfenadine, and fexofenadine, and derivatives thereof.
摘要:
This invention relates to asymmetric hydroformylation (hf) processes in which a prochiral or chiral compound is contacted in the presence of an optically active metal-ligand complex catalyst to produce an optically active aldehyde or product derived from an optically active aldehyde. The invention encompasses novel ligands and catalysts for use in such processes.