摘要:
The invention provides a process for enantioselective hydrocyanation of aromatic vinyl compounds which produces nonracemic mixtures of chiral, arylpropionitriles; novel carbohydrate phosphorus and nickel catalyst compositions; and optically pure (S)-(-)-2-(6-methoxy-2-naphthalene)propionitrile.
摘要:
Process comprising contacting and reacting a diarylketone of the formula RCOR', wherein each of R and R' is aryl, the same or different, and hydrogen over at least a catalytic amount of lead-poisoned palladium catalyst, for example, Lindlar catalyst, at a hydrogen gage pressure in the range from about 150 kPa to about 15,000 kPa, preferably from about 340 kPa to about 3400 kPa, at a temperature in the range from about 50.degree. C. to about 200.degree. C., preferably from about 100.degree. C. to about 150.degree. C., to produce diarylmethanol of the formula RCHOHR', wherein R and R' are as defined above.
摘要:
Reverse osmosis is employed to remove neutral ligands (usually phosphines, phosphites, stibines or arsines) from solutions of dissociable Group VIII metal complexes whereby a ligand-deficient reactive complex (which may be further reacted) is obtained. The products are useful as catalysts and as absorbants for carbon monoxide or acetylene.
摘要:
A process for making hydrogen peroxide from hydrogen and oxygen at superatmospheric pressures employing, as catalyst, Pd on adsorbent carbon, the reaction being run in an aqueous medium comprising substantially no organic component.
摘要:
Process comprising contacting and reacting a diarylmethanol having 13 to 25 carbon atoms and of the formula RCHOHR' wherein each of R and R' is aryl, the same or different, in the liquid state, at a temperature of about 130.degree.-260.degree. C., with gaseous oxygen to produce hydrogen peroxide and diaryl ketone of the formula RCOR' wherein R and R' are the same as above.
摘要:
A process for the production of glyoxylic acid involving the enzymatic oxidation of glycolic acid. The process provides a commercially practical method involving the reaction of glycolic acid in an aqueous solution at a starting concentration range of 200 mM to 2,500 mM in the presence of oxygen, glycolate oxidase and catalase at a pH of 7 to 10 and in the presence of an amine such as ethylenediamine, or tris(hydroxymethyl)-methylamine.
摘要:
The invention provides a process for enantioselective hydrocyanation of aromatic vinyl compounds which produces nonracemic mixtures of chiral, arylpropionitriles; novel carbohydrate phosphorus and nickel catalyst compositions; and optically pure (S)-(-)-2-(6-metehoxy-2-naphthalene)propionitrile.
摘要:
An improved process for directly producing hydrogen peroxide from oxygen and hydrogen is disclosed. Hydrogen and oxygen are contacted in the presence of a catalyst, acid, halide ions and a multifunctional phosphonate or phosphate preparation so as to increase hydrogen peroxide yield and decrease catalyst deactivation.
摘要:
A catalytic process for making H.sub.2 O.sub.2 from H.sub.2 and O.sub.2 in an aqueous medium which comprises using H.sup.+ ions and BR.sup.- ions each, independently, in the range from about 0.001 to about 0.05 M.