The hydroborating agnet, monobromoborane-dimethyl sulfide(H2BBr · SMe2) 2b, was prepared from the reaction of borane-dimethyl sulfide(H3B · SMe2) with carbon tetrabromide in the molar ratio 1 : 1 at 60℃ for 20 h.
during addition of fruit juice in koumiss,sodium citrate of equal molar mass were used as damping fluid for the adjustment of citrate contents to0.25%～0.5%;
The reaction of H2DPC,NiC12-6H20 and phen in H20-CH3OH with equal molar, Two new complexes(2) and (3) with different colors and forms were, obtained successively. And the formulas of which are [Ni(phen)3][Ni(DPC)2]<1 I .
Methylamine (MA) exists in human's blood, urine and tissues. Endogenous FA and an equal molar concentration of hydrogen peroxide (H_2O_2) are derived from the deamination of MA.
The reactions of cis-[Pt(DMSO)2Cl2] and K[Pt(DMSO)Cl3] with various equivalents of 1-β-D-ribofuranosyl- 1,2,4-triazole-3-carboxamide were performed with good yields.
The mixture of benzyl chloride and cinchonidine was refluxed in ethanol for 2～4 h to give ( 8S,9R ) (-) N benzylcinchonidium chloride in 60% yield, >99%e.
The interaction of Ru(OAc)_2(Ph_3P)_2 with one and two equivalents of bis-(diphenylphoshino)ethane[dppe]in refluxing toluene gives Ru(OAc)_2(Ph_3P)(dppe)and Ru (OAc)_2(dppe)_2,respectively,These two compounds have been fully characterized by elemental analysis,IR and NMR spectra.
The interaction of RuCl2(DMSO)4 and 1equivalent of N,N'-bis-[o-(diphenylphosphino) benzyl] ethylene-diamine,i. e.P2N2H4, inrefluxing tetrahydrofuran gives a new diaminodiphosphine ruthenium (Ⅱ) complex, RuCl2(P2N2H4), in high yield.
The QSAR model indicates that the thermodynamic descriptors (heat of formation, log P, and molar refractivity) and steric descriptor (solvent assessable surface area) play an important role for the anti-HIV activity.
The influence factors of the synthesis were discussed, and the best reaction conditions were found: the molar ratio of n-butyraldehyde to 1,2-propanediol is 1:1.5, the amount of catalyst used is 1.2% of feed stock, and the reaction time is 1.0 h.
An ionic liquid (IL) was prepared by directly mixing InCl3 and 1-methyl-3-butylimidazolium chloride(BMIC) with molar ratio 1:1 under dry argon atmosphere.
The enantiomeric excess of the reduction product was up to 83.2% with cyclohexane as the solvent, the molar ratio of ligand: reductive agent: β-acetonaphthalene is 0.04:1.6:1, and 72-hours reaction time at 0°C.
Densities were measured for each of the solutions and the results were used to convert mean ionic activity coefficients on the molal scale to the molar scale.
It was shown that silica mobilization from the granite and redeposition were accompanied by the oxidation of ferrous iron in the granite and extraction of sulfide sulfur in molal amounts similar to or even higher than those of silica.
The hydrophobic interaction parameters thus obtained were linear in both the molecular surface areas of the proteins and the molal surface tension increments of the salts.
Yttrium is found to be able to react with 3,5 - Br2 - PADAP and cetyl pyridi - nium chloride (CPC ), forming a violet ternary comlex Y - 3,5 - Br2 - PADAP - CPC between pH8.0 - 8.5. The molor ratio of the three components in the complex is estimated to be Y: 3,5-Br2 - PADAP: CPC = 1: 3: 3. The wavelenth of max - imum absorbance for the complex is 584nm. The molor absorptivity is 1.29 x 105 at 584nm. The calibration curve well follows Beer's law in the range from 0-5ug of Y in l0ml solution. In the presence ...
The definition, implication and application of quantities of matter and its unit-mol a-mong seren element of SI are analysed in this essay. Quantities of matter and mass, the two essential elements which way not be distinquished easily from each other, are compared to make readers to understand these two elements correctly and to use the appropriate units.
Aminoacylase (N-acylamino acid amido hydrolase, EC 3. 5. 1. 14) from pig kidney is a metalloenzyme which contains 2 moles of Zn (Ⅱ)per mole of protein. Zn2+ plays important roles in the catalysis process of enzyme. Having prepared Mn2+-substituted enzyme and Ni2+- substituted enzyme we investigated their pH-dependence and heat stability with N-chloroacetyl-DL-alanine as substrate, compared to the native enzyme. For Mn2+ or Ni2+-substituted enzymes the optimal pH is in 8. 3-8.4 range, whereas it is 7. 8 for...
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