Reaction of N,N,N',N'-Tetramethyloxamide with Bromine

Reaction of bromine with N,N,N',N'-tetramethyloxamide results in dibromobromate of 3-methyl-5-dimethylimmoniooxazolidin-4-one (in an open system) and in dibromobromate of 4,5,-dibromo-1,3-dimethylimidazolium (in a closed system).     

Protonation constants of 1-hydroxyethylidene-1,1-diphosphonic acid, diethylenetriamino-N,N,N',N',N'-penta-acetic trans-1,2-diaminocyclohexane-N,N,N',N'-tetra-acetic acid

The stepwise stability constants for the protonation of hydroxyethylidenediphosphonic acid (HEDP), diethylenetriaminopenta-acetic acid (DTPA) and diaminocyclohexanetetra-acetic acid (DCTA) have been determined potentiometrically with a hydrogen electrode at an ionic strength of 1 (KCl) and at 10-35 degrees . The data were treated by a least-squares method for estimation of DeltaH and DeltaS values.     

N,N,N‘,N’—四异丁基—3—氧—戊二酰胺萃取铀钍的研究

放射性废液中含有大量的钢系和铜系元素,众多学者作了大量研究工作。如焦荣洲等［’］用三烷基氧磷（ＴＲＰＯ）、赵沪根等［’］用ＤＨＤＥＣＭＰ从放射性废液中分离啊系和湖系元素进行了系统研究。但所用革取剂均为含磷化合物,使用后被放射性污染的革取剂最终处置困难。为此面临寻求革取效率高、价廉,又便于最终处置的新型革取剂的任务。文章ｐｌ合成了二酚胺类化合物（Ｒ‘ＲＺＮＣＯ）。Ｒ３系列车取剂,它能有效地从放射性废液中革取分离回收钢系与调系元素。本文探讨了其中的Ｎ,Ｎ,Ｍ,ＮＷ四异了基一３一氧一戊二酚胺（简写为Ｌ…     

Syntheses and Characterization of Metal Complexes of L－Lysine－N，N，N＇，N＇－tetraacetic Acid and L－Lysine－N，N，N＇，N＇－tetramethylenepho sphonic Acid

ＳｙｎｔｈｅｓｅｓａｎｄＣｈａｒａｃｔｅｒｉｚａｔｉｏｎｏｆＭｅｔａｌＣｏｍｐｌｅｘｅｓＯｆＬ－Ｌｙｓｉｎｅ－Ｎ,Ｎ,Ｎ＇,Ｎ＇－ｔｅｔｒａａｃｅｔｉｃＡｃｉｄａｎｄＬ－Ｌｙｓｉｎｅ－Ｎ,Ｎ,Ｎ＇,Ｎ＇－ｔｅｔｒａｍｅｔｈｙｌｅｎｅｐｈＯｓｐｈｏｎｉ...     

Reaction between Pyrocatechol and N,N,N',N'-Tetraethylphenylphosphonous Diamide

Russian Journal of General Chemistry - The reaction between pyrocatechol and N,N,N',N'-tetraethylphenylphosphonous diamide was studied. It was found that the main reaction products are...     

Potentiometric behavior of N,N,N',N'-tetrabenzylmethylenediamine-based hydrogen ion-selective electrodes

H(+)-ion selective electrodes (H(+)-ISE) based on N,N,N',N'-tetrabenzylalkylenediamine (alkylene: methylene, ethylene, propylene, hexylene) are prepared. We are compared with their response potentials to carbon numbers between diamino groups. They were showed linear selective to hydrogen ion in the range of pH 1.5-9.0, 2.5-9.0, 3.5-9.0 and 4.0-9.0, and their Nernstian slopes were 57.3, 53.5, 57.4 and 56.1 mV pH(-1) at 20+/-0.2 degrees C (theoretical value: 58.2 mV pH(-1)), respectively. The interference effect on the cations were measured to alkali metal ions, alkaline earth metals ions. Selectivity coefficients were measured by the mixed-solution method. Among all electrodes the N,N,N',N'-tetrabenzylmethylenediamine (TBMDA)-based electrode has shown the best selectivity in acidic solution.     

Synthesis and structural investigation of N,N',N' '-trialkylguanidinato-supported zirconium(IV) complexes

The addition of 2 equiv of N,N',N' '-triisopropylguanidine (guanH(2)) to Zr(CH(2)Ph)(4) produced the bis(guanidinato)bis(benzyl)zirconium complex [((i)PrNH)C(N(i)Pr)(2)](2)Zr(CH(2)Ph)(2) (1). The mono(guanidinato) complex [((i)PrN)(2)C(NH(i)Pr)]ZrCl(3) (2) was accessible by the reaction of 2 equiv of guanH(2) with ZrCl(4). Guanidinium hydrochloride, [C(NH(i)Pr)(3)]Cl, is a byproduct of this reaction. When crystallized from THF, complex 2 was isolated as the THF adduct [((i)PrNH)C(N(i)Pr)(2)]ZrCl(3)(THF) (2-THF). The mixed cyclopentadienyl guanidinato complex [eta(5)-1,3-(Me(3)Si)(2)C(5)H(3)][((i)PrNH)C(N(i)Pr)(2)]ZrCl(2) (3) was prepared by treatment of [1,3-(Me(3)Si)(2)C(5)H(3)]ZrCl(3) with the in situ generated lithium triisopropylguanidinate salt. The reaction of guanH(2) with [1,3-(Me(3)Si)(2)C(5)H(3)]ZrMe(3) affords the dimethyl derivative [eta(5)-1,3-(Me(3)Si)(2)C(5)H(3)][((i)PrNH)C(N(i)Pr)(2)]ZrMe(2) (4). Definitive evidence for the molecular structures of these products is provided through single-crystal X-ray characterization of 1, 2-THF, and 3, which are presented. The extent of pi delocalization within the guanidinato ligand is discussed in the context of the metrical parameters obtained from these structural studies.