摘要:
A method for inhibiting corrosion of a metal surface in a liquid medium is described. The method comprises incorporating into the medium a corrosion inhibiting amount of a combination of a surfactant that forms a bilayer on the metal surface in the fluid and a corrosion inhibitor that solubilizes in the medium in the presence of the surfactant. The amount of surfactant is sufficient to produce a bilayer on the metal surface in the medium. The combination isa. an anionic surfactant that forms a bilayer on the metal surface and a cationic corrosion inhibitor;b. a cationic surfactant that forms a bilayer on the metal surface and an anionic corrosion inhibitor;c. an ionic surfactant that forms a bilayer on the metal surface and an ionic corrosion inhibitor having a pendent, generally straight chain hydrocarbon or substituted hydrocarbon moiety of from about 10 to about 18 carbon atoms; ord. an ionic surfactant that forms a bilayer on the metal surface and a non-ionic corrosion inhibitor.Related compositions and methods are also disclosed.
摘要:
2,3,5-trisubstituted-2-cyclopentenones or 2,3-disubstituted-2-cyclopentenones (such as cis-jasmone) are prepared by contacting a 3-chloro-3,4-disubstituted-4-pentene-2-one with a strong base. Methods of preparing the reactants are also disclosed.
摘要:
Synthetic pathways are disclosed for synthesizing derivatives or analogs of fentanyl. Specifically set out are pathways for synthesizing alfentanil, sufentanil and remifentanil. The disclosed methods require fewer steps and produce a greater yield of product than methods reported in the prior art. The pathways to all these compounds begin with a common pathway of condensing a piperidone with a primary amine so as to form a 4-amino carboxyamino-piperidine, wherein N of said piperidone is a —N—COO—(CH2)nCH3, alkylating an N of said primary amine which was condensed with said piperidone thereby producing an N-alkyl-anilide, and hydrolyzing said —COO—(CH2)nCH3? group of said 4-amino-4-carboxyamino-piperidine following the condensation reaction so as to form a piperidine hydrolysis product. This product can then be convened to remifentanil in a 4 step reaction. Also, this hydrolysis product can be treated with a hydride to yield a 4-hydroxymthyl-piperidine which can be converted to alfentanil in 3 further steps, to sufentanil in 3 more steps, or to a variety of remifentanil analogs in two steps.
摘要:
2,3-disubstituted-2-cyclopenenones (such as cisjasmone) are prepared by (a) reacting an alkl 2-chloro-2,3-disubstituted-3-butenoate with a lithiomercaptan compound, (b) subjecting that product to reductive dehydrosulfurization. Methods of preparing the reactants are also disclosed.
摘要:
An alkyl 2-thiosubstituted-3-substituted-2-butenoate ##STR1## is prepared by reacting an alkyl 2-chloro-3-substituted-3-butenoate with a thio compound under phase transfer conditions.
摘要:
The present invention relates to (2S,3R)-N-(2-((3-pyridinyl)methyl)-1-azabicyclo[2.2.2]oct-3-yl)benzofuran-2-carboxamide, novel salt forms thereof, methods for its preparation, novel intermediates, and methods for treating a wide variety of conditions and disorders, including those associated with dysfunction of the central and autonomic nervous systems.
摘要:
Synthetic pathways are disclosed for synthesizing derivatives or analogs of fentanyl. Specifically set out are pathways for synthesizing alfentanil, sufentanil and remifentanil. The disclosed methods require fewer steps and produce a greater yield of product than methods reported in the prior art.
摘要:
Alkaline dishwasher detergent composition having a specific critical pH; relatively high levels of bleach, reserve alkalinity and surfactant; and, preferably, a specific mixture of alkali metal silicates. The detergent composition is substantially free of highly alkaline materials and organic builders.
摘要:
The present invention relates to (2S,3R)-N-(2((3-pyridiny)triethyl)-1-azabicyclo[2.2.2]oct-3-yl)benzofuran-2-carboxamide, novel salt forms thereof, methods for its preparation, novel intermediates, and methods for treating a wide variety of conditions and disorders, including those associated with dysfunction of the central and autonomic nervous systems.
摘要:
A novel scalable synthesis for the preparation of 7-(3-pyridinyI)-1,7-diazaspiro[4.4)nonane has been developed, and 7-(3-pyridinyl)-1,7-diazaspiro[4.4]nonane salts have been formed with succinic acid and oxalic acid. Additionally, 7-(3-pyridinyl)-1,7-diaza-spiro[4.4]nonane has been separated into its stereoisomers via resolution with L and D di-p-toluoyltartaric acids, giving (R)- and (S)-7-(3-pyridinyl)-1,7-diazaspiro[4.4]nonane of high enantiomeric purity. Numerous solid salts of the resulting (R)- and (S)-7-(3-pyridinyl)-1,7-diazaspiro[4.4}nonane have been prepared. Methods for the preparation of the racemic and enantiomeric salts, pharmaceutical compositions comprising such salts, and uses thereof are disclosed. The salts can be administered to patients susceptible to or suffering from conditions and disorders, such as central nervous system disorders, to treat and/or prevent such disorders.