A practically simple, mild and efficient method is developed for the synthesis of N-substituted ureas by nucleophilic addition of amines to potassium isocyanate in water without organic co-solvent. Using this methodology, a variety of N-substituted ureas (mono-, di- and cyclic-) were synthesized in good to excellent yields with high chemical purity by applying simple filtration or routine extraction
Procédé de synthése peptidique à partir de N-carboxyanhydrideaminoacides
申请人:Degussa-Hüls Aktiengesellschaft
公开号:EP1041082A1
公开(公告)日:2000-10-04
Procédé de synthèse peptidique consistant :
(a) à préparer un N-carboxyanhydrideaminoacide de formule :
où R1 et R2 sont un hydrogène ou un radical alkyl, cycloalkyl, aryl ou aryl alkyl, substitué ou non par une ou des fonctions alcool, thiol, amine, sulfure, acide ou amide, et
(b) à réaliser une réaction d'addition entre le composé (I) et un acide aminé ou un peptide ayant au moins une fonction α-aminé libre, en vue d'obtenir un dipeptide ou un peptide de rang supérieur par rapport au peptide additionné.
Provided is a separating agent comprising a carrier and a ligand fixed on a surface of a carrier by chemical bonding, in which the carrier is a core-shell particle formed of a nonporous core and a porous shell, the shell having a pore diameter of 9 nm or more and formed of a hydrolysate of polyalkoxysiloxane, and the ligand is an optically active polymer, optically inactive polyester, protein, nucleic acid, or optically active organic compound with a molecular weight of 50 to 1000.
Methods are provided for reducing the amounts of acrylamide and/or buteneamide in processed foods. The invention further relates to methods for treating processed foods with inhibitors, including organic amino compound, organic sulfhydryl compounds, and certain other compounds (e.g., disulfide reducing agents), to reduce the amount of acrylamide and/or buteneamide in processed food exposed to high temperature conditions (generally above about 110° C.) during manufacturing or cooking.
Hydantoin-D,L-valine: Synthesis, characterization, and non-covalent interaction analysis from crystallographic studies, DFTB calculations, and Hirshfeld surface analysis
作者:Gerzon E. Delgado、Asiloé J. Mora、Cecilia Chacón、Gustavo Marroquin、Iván Brito
DOI:10.1016/j.molstruc.2024.137610
日期:2024.5
with formula C6H10N2O2 has been synthesized and structurally characterized by FT-IR, NMR, and X-raydiffraction techniques. Spectroscopy results are consistent with the skeleton structure. The powderX-raydiffraction data confirms the phase purity of the crystalline sample. Single-crystalX-raydiffraction analysis indicated that the title compound crystallizes in the monoclinic space group P21/c (N°14)
合成了标题化合物乙内酰脲-D,L - d a line或( RS )-5-异丙基-咪唑烷-2,4-二酮,一种新型氨基酸乙内酰脲衍生物,结构式为C 6 H 10 N 2 O 2并通过 FT-IR、NMR 和 X 射线衍射技术进行结构表征。光谱结果与骨架结构一致。粉末 X 射线衍射数据证实了晶体样品的相纯度。单晶X射线衍射分析表明,标题化合物结晶于单斜空间群P 2 1 / c (N°14),Z = 4,晶胞参数a = 5.493(3) Å,b = 23.53( 2) 埃,c = 6.254(3) 埃,β= 115.09(4)°,V = 732.1(9) 埃3。分子结构和晶体堆积通过分子间 N–H…O、C–H…O 和 C–H…π 氢键稳定,形成无限二维网络,其链由图-描述集合符号 C(5),以及带有图 R 2 2 (8) 和 R 4 4 (16) 的中心对称环。采用 DFTB 计算分析非共价相互作用,该计算再现了