摘要:
A quaternary ammonium compound of formula (X): where each of R1-R4 is independently an optionally substituted alkyl, alkenyl, or aryl group having fewer than 8 carbon atoms and R5 is hydrogen or an optionally substituted hydrocarbyl group. Also claimed is a method of preparing a quaternary ammonium salt comprising reacting a tertiary amine of formula R1R2R3N with a quaternizing agent selected from: an ester of formula R5COOR4; a carbonate compound of formula R0OCOOR4 and then a carboxylic acid of formula R5COOH; and an epoxide having fewer than 8 carbon atoms and a carboxylic acid of formula R5COOH, where R0 is an optionally substituted hydrocarbyl group. Preferably the compounds as defined above are used as additives in a fuel composition, preferably a diesel or gasoline fuel. Also claimed is the use of a quaternary ammonium compound as defined above to improve the performance of an engine, preferably by combating deposits in the engine. Preferably the compounds or compositions may be used to achieve keep clean or clean up performance.
摘要:
A method for the stabilization of an aqueous choline hydroxide solution includes optionally, adding a first stabilizer of a dithionite salt or a dialkylhydroxylamine to an aqueous solution containing reactants that will produce an aqueous choline hydroxide solution; and after the aqueous choline hydroxide solution is formed, adding a second stabilizer of a dithionite salt or a dialkylhydroxylamine to the aqueous choline hydroxide solution. The stabilized choline hydroxide solution may include choline hydroxide, water, and a dithionite salt and/or a dialkylhydroxylamine as a stabilizer present in an amount of about 100 ppm to about 2000 ppm by weight of the stabilized choline hydroxide solution.
摘要:
The novel positively charged pro-drugs of prostaglandins, prostacyclins and related compounds in the general formula (2) 'Structure 2' were designed and synthesized. The compounds of the general formula (2) 'Structure 2' indicated above can be prepared from protected prostaglandins, prostacyclins, and related compounds, by reaction with suitable alcohols, thiols, or amines and coupling reagents, such as N, N'-Dicyclohexylcarbodiimide, N, N'-Diisopropylcarbodiimide, O-(Benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate, O-(Benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate, Benzotriazol-1-yl-oxy-tris (dimethylamino)phosphonium hexafluorophosphate, et al. The positively charged amino groups of these pro-drugs not only largely increases the solubility of the drugs in water, but also bonds to the negative charge on the phosphate head group of membranes and pushes the pro-drug into the cytosol. The results suggest that the pro-drugs diffuse through human skin ∼1000 times faster than do prostaglandins, prostacyclins, and related compounds. In plasma, more than 90% of these pro-drugs can change back to the parent drugs in a few minutes. The prodrugs can be used medicinally in treating any prostaglandins, prostacyclins, and related compounds-treatable conditions in humans or animals. The prodrugs can be administered transdermally for any kind of medical treatments and avoid most of the side effects of prostaglandins, prostacyclins, and related compounds. Controlled transdermal administration systems of the prodrug enable prostaglandins, prostacyclins, and related compounds to reach constantly optimal therapeutic blood levels to increase effectiveness and reduce the side effects of prostaglandins, prostacyclins, and related compounds. Another great benefit of transdermal administration of these pro-drugs is that administering medication, especially to children, will be much easier.
摘要:
A salt of a sulfonated dye comprising an ammonium cation as a counterion. The ammonium cation comprises at least 3 hydroxyl groups. The salt is useful in reducing kogation in thermal inkjet printheads. One example of these salts is the compound of formula (II): wherein M is Ga(OH); and each of Z1+, Z2+, Z3+ and Z4+ is protonated 2,2-bis(hydroxymethyl)- 2,2',2' '-nitrilotriethanol.
摘要:
The novel positively charged pro-drugs of mustards and related compounds in the general formula (1) 'Structure 1' were designed and synthesized. The compounds of the general formula (1) 'Structure 1' indicated above can be prepared from mustards and related compounds , by reaction with suitable alcohols, thiols, or amines and coupling reagents, such as N, N'-Dicyclohexylcarbodiimide, N, N'-Diisopropylcarbodiimide, O-(Benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate, O-(Benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate, Benzotriazol-1-yl-oxy-tris (dimethylamino)phosphonium hexafluorophosphate, et al. The positively charged amino groups of these pro-drugs not only largely increases the solubility of the drugs in water, but also bonds to the negative charge on the phosphate head group of membranes and pushes the pro-drug into the cytosol. The results suggest that the pro-drugs diffuse through human skin ~100 times faster than do mustards and related compounds. In plasma, more than 90% of these pro-drugs can change back to the parent drugs in a few minutes. The prodrugs can be used medicinally in treating any mustards and related compounds-treatable conditions in humans or animals. The prodrugs can be administered transdermally for any kind of medical treatments and avoid most of the side effects of mustards and related compounds. Controlled transdermal administration systems of the prodrug enables mustards and related compounds to reach constantly optimal therapeutic blood levels to increase effectiveness and reduce the side effects of mustards and related compounds. Another great benefit of transdermal administration of these pro-drugs is that administering medication, especially to children, will be much easier.
摘要:
A process for making a tertiary amine ester of formula (I), the process comprising: (a) reacting a ketone or an aldehyde having formula (III) with a glycol to form a ketal or an acetal; (b) reacting the ketal or the acetal with acrylonitrile to form an ether nitrile; (c) reducing the ether nitril to a tertiary amine ketal or a tertiary amine acetal; (d) hydrolyzing the tertiary amine ketal or the tertiary amine acetal to a tertiary amine diol; and (e) esterifying the tertiary amine diol to the tertiary amine ester of formula (I), wherein R?1 and R2¿ are each independently a hydrogen atom or a linear, branched, or cyclic alkyl, alkylene, alkaryl, or aryl-containing group containing 1 to 18 carbon atoms; and each R3 are each independently of one another fatty acid radicals having 6-22 carbon atoms. The process may optionally include the further step of: (f) protonating or quaternizing the tertiary amine ester of formula (I) to a protonated or quaternary amine ester of formula (II) wherein A- is an inorganic or organic anion.
摘要:
Die Erfindung betrifft kristallines Cholinascorbat, insbesondere Cholinascorbat in Form kristallwasserfreier Kristalle, Verfahren zu ihrer Herstellung und deren Verwendung.
摘要:
Die Erfindung betrifft kristallines Cholinascorbat, insbesondere Cholinascorbat in Form kristallwasserfreier Kristalle, Verfahren zu ihrer Herstellung und deren Verwendung.
摘要:
Stable and non hygroscopic salts consisting of L-carnitine or alkanoyl-L-carnitine choline tartrate are disclosed which are suitable for preparing solid compositions useful as dietary/nutritional supplements for human use and as fodder supplement for veterinary purposes.