TransamidationC-N bond formationamidesNH2OH⦁HCl reagentDFT analysisAn efficient transamidation process has been described under solvent-less conditions. The transformation has been accomplished by employing NH2OHHCl as a reagent and amines as substrates. The developed method is achieved in the absence...
To calculate the limiting reagent, enter an equation of a chemical reaction and press the Start button. The reactants and products, along with their coefficients will appear above. Enter any known value for each reactant. The limiting reagent will be highlighted in red. Theoretical yields of ...
要:以肉桂醛为原料,在无溶剂的条件下Si02/K2CO促进一步法直接制备肉桂腈。确定的最 佳反应条件是:当肉桂醛:盐酸羟胺:碳酸钾=1:1.5:0.85(摩尔比),SiO:用量为每mmol肉桂醛0.3 ～0.4g,室温下彻底研磨均匀后,以微波730W火力加热4～5min,制备效果最佳。在此条件下从 ...
这个计算器将进行化学计量计算。 🛠️ 计算反应化学计量 ➜ Instructions To perform a stoichiometric calculation, enter an equation of a chemical reaction and press the Start button. The reactants and products, along with their coefficients will appear above. Enter any known value....
含量(NH2OH.HCl)Assay,% ≥ 99.0 98.5 97.0 水溶液反应Water solution reaction 合格 合格 合格 澄清度试验Clarity 合格 合格 合格 灼烧残渣(以硫酸盐计)Ignition residue,% ≥ 0.01 0.01 0.05 硫酸盐(SO4)Sulfate,% ≥ 0.002 0.002 0.005 铵盐(NH4) Ammonium,% ≥ 0.1 0.1 0.3 ...
A simple, efficient, and metal-free method was developed for the synthesis of phosphoroamidates. In essence, a mixture of sodium periodate (NaIO4) and hydroxylamine (NH2OHHCl) was used in stoichiometric amounts to execute the phosphoramidation reaction of aromatic amines and triethyl phosphites ...
A.NaOH B.Fe(OH)3C.H2O D.HCl E.H2SO4 6.某溶液加入甲基红指示剂呈黄色,加入酚酞指示剂呈无色,若需稳定此pH,加入的缓冲溶液是( ) A.HAc—NaAc(pKa=4.75)B.Na2HPO4—Na3PO4(pKa3=12.67) C.H2CO3—HCO3-(pKa=6.35)D.H3PO4—NaH2PO4(pKa1=2.12) E.NH4+—NH3(pKa=9.25) 7.pH玻璃电极的电极...
A ring-opening process of 4-imino-1,3-thiazetidin-2-ones with NH2OH路HCl was described for the first time. Two different scaffolds of imidodicarbonic diamide were obtained selectively in good yields in the presence of organic base. The obtained imidodicarbonic diamides were demonstrated by X...
Wen-Yuan TangJing-Jing GuoXing-XingGuiDe-Man HanJian-Jun Li中国化学快报(英文版)An efficient synthesis of imidodicarbonic diamides from 1,3-thiazetidin-2-ones with NH2OHáHCl via ring-opening reaction. W.Tang,J.Guo,X.Gui,D.Han,J.Li. Chinese Chemical Letters . 2015...
Direct transformation of both aliphatic and aromatic aldehydes to the corresponding nitriles, can be easily performed by the reaction of an aldehyde with a slight excess of hydroxylamine hydrochloride, in refluxing acetonitrile and in the presence of 0.5 equivalents of sodium iodide as catalyst....