摘要:
A process for producing alpha-tocopherol from non-alpha-tocopherols comprising reacting the tocopherol with formaldehyde, carrying out the reaction at a temperature of at least about 175.degree. C. in the presence of a catalytic amount of an acidic ion exchange resin and subjecting the reaction mixture to catalytic hydrogenation.
摘要:
This invention relates to the dehydrogenation of a 3-.beta.-hydroxy steroid or a mixture of soy sterols to form the corresponding mixture of .DELTA..sup.4 -3-keto derivatives of phytosterols, the improvement which comprises dehydrogenation of the steroid or mixture of sterols using a supported nickel catalyst and carrying out the dehydrogenation in the presence of at least two chemically different hydrogen acceptors. One such process uses a supported nickel catalyst and a dialkyl ketone, such as methyl ethyl ketone, and an olefin, such as 1-hexene, as the two different hydrogen acceptors.
摘要:
Provided are 3-oxoadipate esters of certain polyols which are useful as crosslinkers in thermosetting coating compositions. Also provided are such thermosetting compositions comprised of a curable hydroxyl-functional polymer such as a polyester or acrylic and the crosslinkers of the present invention. Such compositions offer a significant improvement in curing temperature.
摘要:
Disclosed is a process for preparation of an amino acid, such as phenylalanine, with a high degree of optical purity. The process makes use of the same amino acid as a chiral template.
摘要:
This invention relates to the dehydrogenation of a 3-.beta.-hydroxy steroid or a mixture of soy sterols to form the corresponding mixture of .DELTA..sup.4 -3-keto derivatives of phytosterols, the improvement which comprises dehydrogenating the steroid or mixture of sterols using an activated non-pyrophoric nickel catalyst and carrying out the oxidation in the presence of a diaryl ketone. One such process uses a non-pyrophoric Raney nickel type catalyst and a diaryl ketone, such as benzophenone as a hydrogen acceptor.
摘要:
Provided are curable copolymers having 1,3-dioxolan-2-one-4-yl groups incorporated therein. The copolymers are useful as binders in coating compositions and can be cured with primary amine cross-linking compounds to form a continuous polyurethane coating.
摘要:
Provided are polyester resins containing hydroxy functionalized isophthalate ester moieties useful in coating compositions. The invention provides both solvent-borne as well as water-borne coating compositions comprised of the resins and a crosslinker such as a melamine-type crosslinker. Polyester resins of the present invention having a T.sub.8 of greater than about 50.degree. C. are useful in thermosetting powder coating compositions. The coatings thus provided possess excellent acid resistance, hardness, impact resistance, and stain resistance.
摘要:
A process for separating the various members of a tocopherol homologue mixture to obtain fractions of the separate tocopherol homologues. The isolation of the various tocopherol homologues is accomplished by selective deacylation of tocopheryl esters followed by separation of the esters from the free tocopherols.
摘要:
The invention relates to a process for dehydroformylation of dinorcholanaldehydes and dinorcholenaldehydes to form 17(20)-pregnenes or 20-pregnenes. The dehydroformylation is carried out using a noble metal catalyst, and preferably carried out in the presence of a hydrogen acceptor.
摘要:
A process for separating the .alpha.-tocopherol homologues from the other ester members of a tocopherol homologue mixture. The isolation of the .alpha.-tocopherol homologue is accomplished by selective deacylation of a mixture of tocopheryl esters in the presence of a base catalyst followed by separation of the .alpha.-ester from the other free tocopherols.