摘要:
A process of forming 2-bromo-2-nitro-1,3-propanediol by contacting a 5-nitro-1,3-dioxane with bromine under alkaline conditions and hydrolyzing the brominated product.
摘要:
Formylating the amino nitrogen of an alkali metal salt of an amino carboxylic acid, by reacting the salt with an alkyl formate in an alkanol solvent. In one embodiment, the alkyl formate is added to the reaction as such; in another embodiment, the alkyl formate is formed in situ by reaction of carbon monoxide with the alkanol solvent in the presence of the alkali metal salt of the amino carboxylic acid. The process provides a new class of compounds, the alkali metal salts of N-formyl-aspartic acids.
摘要:
Compositions comprising (±)-2-((dimethylamino)methyl)cyclohexanone, a transition-metal salt, and an organic solvent and methods of preparing (±)-cis-2-((dimethylamino)methyl)-1-(aryl)cyclohexanols, in particular (±)-cis-2-((dimethylamino)methyl)-1-(3-methoxyphenyl)cyclohexanol, are disclosed herein. In one embodiment, the (±)-2-((dimethylamino)methyl)cyclohexanone and transition-metal salt are in the form of a (±)-2-((dimethylamino)methyl)cyclohexanone:transition-metal salt complex. In another embodimemt, aryl is 3-methoxyphenyl.
摘要:
A hydroxy-carboxylate ester is converted to an amino-acid-amide by replacement of the --OH group with --N.sub.3, via, e.g., CH.sub.3 SO.sub.2 Cl and NaN.sub.3 ; reacting with amine to convert the ester to amide; and hydrogenating --N.sub.3 to --NH.sub.2. The present process alleviates the conventional use of blocking-deblocking procedures.
摘要:
The invention provides methods for suppressing the degradation of wood, wood products, and wooden structures due to infestation by wood-boring organisms, by use of a polyurea composition. The invention also provides for wood, wood products, and wood structures that are resistant to degradation due to borer infestation by use of a polyurea composition.
摘要:
The invention is directed to novel compounds that are used in the formation of polyurea compositions, including one-part and two-part polyurea compositions. The invention is also directed to polyureas formed from such compounds, cross-linked polyureas, and UV-stabilized polyureas.
摘要:
The present invention is directed to a process for reducing the level of α, β-unsaturated ketone in an opioid analgesic composition by hydrogenation with diimide or a diimide progenitor.
摘要:
Synthesis of phenylserine ester (a) via benzaldehyde and glycine ester using serine hydroxymethyltransferase; and (b) via methyl benzoylacetate. Synthesis of hydroxy-aspartame or derivative by enzymatic coupling of phenylserine or derivative with aspartic acid or derivative. Hydrogenation of the coupled product to give as final product aspartame or analog with related processes and products.
摘要:
The invention provides methods for suppressing the degradation of wood, wood products, and wooden structures due to infestation by wood-boring organisms, by use of a polyurea composition. The invention also provides for wood, wood products, and wood structures that are resistant to degradation due to borer infestation by use of a polyurea composition.
摘要:
Synthesis of phenylserine ester (a) via benzaldehyde and glycine ester using serine hydroxymethyltransferase; and (b) via methyl benzoylacetate. Synthesis of hydroxy-aspartame or derivative by enzymatic coupling of phenylserine or derivative with aspartic acid or derivative. Hydrogenation of the coupled product to give as final product aspartame or analog with related processes and products.