Abstract:
Amines and amine derivatives that improve the buffering range, and / or reduce the chelation and other negative interactions of the buffer and the system to be buffered. The reaction of amines or polyamines with various molecules to form polyamines with differing pKa's will extend the buffering range, derivatives that result in polyamines that have the same pKa yields a greater buffering capacity. Derivatives that result in zwitterionic buffers improve yield by allowing a greater range of stability.
Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von Zinnalkoxiden. Insbesondere betrifft die Erfindung ein Verfahren zur Direktsysthese von Zinnalkoxiden der allgemeinen Formel Sn(OR) n mit n = 2 oder 4 aus elementarem Zinn durch Umsetzung mit entsprechenden Alkoholen. Es wird vorgeschlagen, elementares Zinn mit wenigstens der n-fachen molaren Menge eines Alkohols der allgemeinen Formel ROH insbesondere unter Rückfluss zu erhitzen und den überschüssigen Alkohol zum Erhalt des entsprechenden Zinnalkoxides abzutrennen.
Abstract:
A method of transalkoxylation of nucleophilic compounds in which an alkoxylated and a nucleophilic compound are combined in a suitable vessel and reacted in the presence of a heterogeneous catalyst under conditions capable of transferring at least one hydroxyalkyl group from the alkoxylated compound to the nucleophilic compound. The method is especially useful in the transalkoxylation of alkanolamines to transfer a hydroxyalkyl group from an alkanolamine having a greater number of hydroxyalkyl groups to an alkanolamine having a lesser number of hydroxyalkyl groups.
Abstract:
The present invention provides methods of carrying out the safe and reliable preparation of lipids comprising quaternary amines. Such lipids are especially suited for introducing therapeutic agents into cells or organisms. In particular, the lipids of the invention are suitable for the efficient transfer of gene therapy agents into mammalian cells or organisms in a cell type specific or tissue specific manner.
Abstract:
Alkanolamine compositions are disclosed. The composition comprises an alkanolamine and hydroxylamine or hydrazine. Preferred alkanolamine includes diethanolamine, triethanolamine, and mixtures thereof. The composition of the invention has significantly reduced discoloration.
Abstract:
The present invention relates to ionic liquid comprising an anion and a cation wherein the cation is a primary, secondary or tertiary ammonium ion containing a protonated nitrogen atom.
Abstract:
The invention relates to novel Acyl coenzyme-A mimics, compositions comprising ketone compounds, and methods useful for treating and preventing cardiovascular diseases, dyshpidemias, dysproteinemias, and glucose metabolism disorders comprising administering a composition comprising a ketone compound. The Acyl coenzyme-A mimics, compositions, and methods of the invention are also useful for treating and preventing Alzheimer's Disease, Syndrome X, peroxisome proliferator activated receptor-related disorders, septicemia, thrombotic disorders, obesity, pancreatitis, hypertension, renal disease, cancer, inflammation, bacterial infection and impotence. In certain embodiments, the Acyl coenzyme-A mimics, compositions, and methods of the invention are useful in combination therapy with other therapeutics, such as hypocholesterolemic and hypoglycemic agents.
Abstract:
The present invention relates to a continuous process for the manufacture of triethanolamine (TEA) comprising, in succession: (i) a step of synthesizing the TEA by continuously bringing ammonia into contact with ethylene oxide under conditions allowing the formation of a reaction mixture comprising mono-, di- and triethanolamines, (ii) a step of continuously separating the ammonia that has not reacted from the reaction mixture and (iii) a step of continuously separating the TEA from the mixture resulting from step (ii). The process is characterized in that a specific mixture of alkanolamines, comprising TEA and from 0,5 to 50 % by weight of at least one secondary dialkanolamine, is prepared or isolated from the mixture resulting from step (ii), and in that the TEA is separated and isolated with a degree of purity equal to or greater than 99.2 % by weight, by a continuous distillation of the specific mixture of alkanolamines. The present invention also relates to a colourless TEA having a high purity, that can be obtained by the process according to the invention and especially has a high resistance to coloration.