16480-57-2Relevant articles and documents
Bimetallic organotin(IV) complexes with ferrocene-based azomethines: Synthesis, characterization, semi-empirical study, and antibacterial activity
Tahira, Khizra,Ali, Saqib,Shahzadi, Saira,Sharma, Saroj K.,Qanungo, Kushal
, p. 1871 - 1884 (2011)
A series of bimetallic organotin(IV) complexes with ferrocene-based azomethines (Schiff bases) were synthesized by reacting sodium salt of tranexamic acid, 4-amino butanoic acid, and phenyl alanine with trimethyltin and tributyltin chloride in 1 : 1 molar ratio under inert atmosphere. The synthesized trialkyl organotin complexes condense with formyl ferrocene under inert atmosphere to yield organotin(IV) ferrocenyl Schiff bases. Composition of the organotin(IV) complexes, bonding behavior of donor groups, and structural assignments were studied by elemental analysis, FT-IR, 1H, 13C, 119Sn NMR, and mass spectrometry. The spectral data suggest that the ligand is bidentate, coordinating through oxygens. Spectroscopic techniques reveal distorted tetrahedral geometry in solution for the complexes. As solids, the complexes are trigonal bipyramidal, confirmed by semi-empirical study. Mass spectrometric and elemental analysis data support the solid and solution spectroscopic results. Bioactivity screenings show invitro biological potential.
Liquid fluorescent whitener and preparation method thereof
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Paragraph 0073, (2017/01/02)
The invention relates to a liquid fluorescent whitener and a preparation method thereof, and belongs to the technical field of special assistants for printing, dyeing and papermaking. A technical problem to be solved is providing the liquid fluorescent whitener and the preparation method thereof. The effective component of the fluorescent whitener is 4,4'-bis[(4-anilino-6-Ramino acid)-1,3,5-triazinyl-2-yl)amino]stilbene-2,2'-tetrasulfonic acid tetrasodium salt, wherein R is a phenyl ring-containing amino acid group. The preparation method comprises the following steps: mixing 4,4'-diaminostilbene-2,2'-disulfonic acid with a NaOH solution to prepare a sodium 4,4'-diaminostilbene-2,2'-disulfonate solution product I, and mixing amino acids with the NaOH solution to prepare an amino acid sodium salt; adding an emulsifier, concentrated hydrochloric acid, cyanuric chloride and sodium sulfanilate to ice water, and reacting to generate a product II; adding the product I to the product II to generate a product III; and adding the amino acid sodium salt to the product III to obtain a crude whitener IV, carrying out pumping filtration, and carrying out desalting concentration to obtain the liquid fluorescent whitener.
Natural amino acid salt catalyzed aldol reactions of isatins with ketones: highly enantioselective construction of 3-alkyl-3-hydroxyindolin-2-ones
Chen, Gong,Ju, Yuan,Yang, Tao,Li, Zicheng,Ang, Wei,Sang, Zitai,Liu, Jie,Luo, Youfu
, p. 943 - 947 (2015/09/01)
Abstract The asymmetric synthesis of 3-alkyl-3-hydroxyindolin-2-ones via direct aldol reaction of isatin with ketones catalyzed by natural amino acid salts is described, in which the phenylalanine lithium salt was found to be the best catalyst. This strategy was then applied to a variety of isatin and ketone substrates and the corresponding aldol products were obtained in excellent yields (up to 97%) with good to excellent enantioselectivities (up to 90%).
Hydration of amino acids from ultrasonic measurements
Burakowski, Andrzej,Gliński, Jacek
experimental part, p. 12157 - 12161 (2011/01/11)
In this paper the results of compressibility of aqueous solutions of amino acids in water and in aqueous HCl and NaOH solutions at 25 °C are presented. The effect of the charged protonated amino groups and deprotonated carboxylic groups on the hydration number was tested. The idea of additivity of the hydration number with the constituents of the solute molecule was successfully applied and discussed.
NITRIC OXIDE DONATING PROSTAMIDES
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Page/Page column 38, (2009/04/25)
Nitroderivatives of prostaglandins having improved pharmacological activity and enhanced tolerability are described. They can be employed for the treatment of glaucoma and ocular hypertension.
Mild regeneration of the carboxylic group of amino acid alkyl esters by aqueous methanolic sodium hydrogen carbonate via 5-oxazolidinones
Allevi, Pietro,Anastasia, Mario
, p. 7663 - 7665 (2007/10/03)
A simple racemization-free procedure allows the regeneration of the carboxylic acid group of amino acid alkyl esters by way of an intermediate 5-oxazolidinone which is hydrolyzed by treatment with sodium hydrogen carbonate in aqueous methanol.