La Conversion de l'adduit anionique amine-acide benzlidene meldrumique, PhCH(RR'N)C − (COO) 2 C(CH 3 ) 2 (TA − ) en benzaldehyde et anion de l'acide meldrumique est assujetti a une catalyze acide generale, indiquant que la protonation du carbone de TA - 浇注前 PhCH(RR'N)CH(COO) 2 C(CH 3 ) 2 (TA o ) limite la vitesse
Highly sterically hindered carbon acids: the intrinsic reactivity of 5,5′,5″-trimethyl- and 3,3′,3″,5,5′,5″-hexamethyl-2,2′,2″,4,4′,4″-hexanitrotriphenylmethanes
作者:François Terrier、Lan Xiao、Patrick G. Farrell、Danielle Moskowitz
DOI:10.1039/p29920001259
日期:——
important steric effects are operating in the ionization of 2 and 3. These arise from the accumulation of ortho-nitro groups in the triphenylmethane system which makes the approach of the base reagents from the exocyclic carbon of 2 and 3 very difficult. The finding of extremely low intrinsic reactivities for 2 and 3 and the observation of a much greater catalyticefficiency of primaryamines than of
Bunting, John W.; Stefanidis, Dimitrios, Journal of the American Chemical Society, 1990, vol. 112, # 2, p. 779 - 786
作者:Bunting, John W.、Stefanidis, Dimitrios
DOI:——
日期:——
Bernasconi, Claude F.; Panda, Markandeswar; Stronach, Michael W., Journal of the American Chemical Society, 1995, vol. 117, # 36, p. 9206 - 9212
作者:Bernasconi, Claude F.、Panda, Markandeswar、Stronach, Michael W.
DOI:——
日期:——
Water proton NMR detection of amide hydrolysis and diglycine dimerization
作者:Katharine T. Briggs、Marc B. Taraban、Y. Bruce Yu
DOI:10.1039/c8cc03935f
日期:——
The transverse relaxation rate of water protons R2(1H2O) is found to be sensitive to amidehydrolysis and diglycine dimerization. The results demonstrate the feasibility of using R2(1H2O) as a diagnostic tool to detect chemical changes in aqueous solutions. Potential applications include drug product formulation and inspection.
发现水质子R 2(1 H 2 O)的横向弛豫速率对酰胺水解和二甘氨酸二聚化敏感。结果证明了使用R 2(1 H 2 O)作为诊断工具检测水溶液中化学变化的可行性。潜在的应用包括药品配方和检查。