Triethylamine metal complexes

Other sensors are mostly grouped towards the triethylamine. In the case of porphyrins 6-8, 13 the coordinated metal is no longer able to drive the selectivity pattern and the presence of the peripheral alkyl chains completely shadows the coordination interactions. This result can explain the failure to observe the coordination interaction in the sensing mechanism of the metal complexes of the closely related alkyl chains functionalized phthalocyanines reported in the past by Gopel and coworkers [22]. 

The sol-gel entrapment of the metal complexes [Ru(p-cymene)(BINAP)Cl]Cl and the rhodium complexes formed in situ from the reaction of [Rh(COD)Cl]2 with DlOP and BPPM has been reported by Avnir and coworkers [198]. The metal complexes were entrapped by two different methods the first involved addition of tetramethoxysilane to a THF solution of the metal complex and triethylamine, while the second method was a two-step process in which aqueous NH4OH was added to a solution of HCl, tetramethoxysilane and methanol at pH 1.96 followed by a THF solution of the appropriate metal complex. The gel obtained by each method was then dried, crushed, washed with boiling CH2CI2, sonicated in the same solvent and dried in vacuo at room temperature until constant weight was achieved. Hydrogenation of itaconic acid by these entrapped catalysts afforded near-quantitative yields of methylsuccinic acid with up to 78% e.e. In addition, the catalysts were found to be leach-proof in ethanol and other polar solvents, and could be recycled. 

Triazolopyrimidine, dimethyl-metal complexes, 93 Tricarboxylic acids metal complexes naturally oocurring, 962 Triethylamine W-oxide... 

Photoreduction of benzophenone by primary and secondary amines leads to the formation of benzpinacol and imines [145]. Quantum yields greater than unity for reduction of benzophenone indicated that the a-aminoalkyl radical could further reduce the ground state of benzophenone. Bhattacharyya and Das confirmed this in a laser-flash photolysis study of the benzophenone-triethylamine system, which showed that ketyl radical anion formation occurs by a fast and a slow process wherein the slow process corresponds to the reaction of a-aminoalkyl radical in the ground state of benzophenone [148]. Direct evidence for similar secondary reduction of benzil [149] and naphthalimides [150] by the a-aminoalkyl radical have also been reported. The secondary dark reaction of a-aminoalkyl radicals in photo-induced electron-transfer reactions with a variety of quinones, dyes, and metal complexes has been studied by Whitten and coworkers [151]. 

A number of symmetrically substituted cyclopentadienone metal complexes have been prepared by metalcarbonyl-mediated dimerization of alkynes [23a, 24]. The (tetracyclopropylcyclopentadienone)tricarbonyliron complex 27 can easily be obtained as the major product by ironcarbonyl-mediated dimerization with CO insertion of dicyclopropylacetylene [25]. Upon treatment of the complex 27 with triethylamine N-oxide, the uncomplexed tetracyclopropylcy-clopentadienone 28 apparently is liberated however, in contrast to the kineti-cally sufficiently stabilized tetra-ferf-butylcyclopentadienone 19 (see Scheme 5)... 

The first examples of the tervalent tautomer of phosphinous acids have been prepared as transition-metal complexes (134). The structures were assigned on the basis of distinctive spectral evidence and reactions with diazomethane and triethylamine to give (135) and (136) respectively. ... 

It is important to note that some reactions leading formally to cr-vinyl- and a-a kynyl complexes of transition metals can be produced via different mechanisms. For example, the reaction of the ruthenium complex IV-9 with terminal alkynes gives rise to the formation of vinylidene-metal complexes IV-10, which can be converted to the alkynyl-ruthenium derivatives IV-11 by the action of triethylamine [23]. 

Even under drastic conditions, Ru3(CO)i2 alone gives compound 11 only with difficulty. Both rate and selectivity are markedly enhanced by addition of a large amount of a base such as triethylamine the molar ratio should be no lower than two relative to the azo derivative. The mechanism of this reaction is peculiar because we could show that the amine works as an oxygen scavenger and the metal complex apparently only catalyses the transfer of the N-bound oxygen atom to CO, with formation of CO2, so that the reaction becomes catalytic with regard to the amine (Scheme 6). 

Transplutonium(VI) complexes aqua,1220 carbonates, 1220 carboxylates chelating, 1220 halogens, 1220 monocarboxyiates, 1220 nitrato, 1220 oxides, 1220 oxoanions, 1220 Triethanolamine alkali metal complexes, 23 Triethylamine, 2,2, 2"-trimethoxy-alkali metal complexes, 24 Trimolybdates, 1032 Trithioarsenates, 249 1,3,6,2-Trithioarsocane, 2-chloro-, 249 Trithioraolybdates, 1378 Trivanadates, 1027... 

Polymerization of substituted acetylenes has been carried out by a wide range of catalysts and condi-tions. Polymerization conditions include a homogeneous and heterogeneous Ziegler—Natta catalyst, transition metal complexes (Pd. Pt. Ru. W. Mo. Ni. etc.), free radical initiators such as 2.2 -azobis(isobu-tyronitrile) (AIBN). benzoyl peroxide (BPO). and di-tert-butylperoxide (DTBP). thermal polymerization, y-irradiation. cationic initiation with BF3. and anionic initiation by butyllithium. triethylamine. and sodium amide. 

QCM coated with thin films of metal complexes of protoporphyrin IX dimethyl ester (M-PPIX) deposited by electropolymerization was used to detect the vapors of triethylamine, acetic acid, ethanol, and toluene [52]. Poly-Ni(PPIX) shows larger sensitivity to toluene due to n-n interaction. 

Carboxy derivatives of seco-corrin metal complexes can be synthesized as shown in Scheme 17. Using the nickel(II) complex (86), treatment with acetic acid/triethylamine in toluene at 110° gave a 56% yield of the nickel corrin (87), along with about 20% of the decarboxylated uncyclized material (88). This latter observation suggested that the ring closure step precedes decarboxylation in accord with this it was shown that the intermediate nickel 19-carboxy-... 

The first route to 2H-azaphosphirene complexes XIII, published by Streubel et al. in 1994 [22], used a triethylamine-induced condensation-rearrangement cascade starting from amino(aryl)carbene metal complexes VIII and [bis-(trimethylsilyl)methylene]halophosphanes IX (X=Cl,Br) (Schemes) the yields are generally good (50 - 85%) [19,23]. Experimental details and scope of this method as well as progress in this field were summarized quite recently [24]. 

Saitoh et al. [152] separated seven rare-earth ions (Nd(III), Gd(III), Tb(III), Dy(ni), Ho(ni), Er(III), Lu(III)) as their tetraphenylporphine complexes using a C 8 column (2 = 555 nm) and a 90/10 methanol/water (0.5% acetylacetone with 0.68% triethylamine) mobile phase. Injections of 10 pL of 0.1 mM metal-complex solutions were made. The Nd(III) complex was stable for less than one hour in any of the solvents methanol, acetone, acetonitrile, or dichloromethane. Elution was complete in <15 min. Similarly, the tetraphenylporphine complexes of VO(IV), Cu(II), Ni(II), Zn(II), and Pd(II) were resolved on a C g column (X = 420nm) using a metha-nol/octane mobile phase where octane was present at less than 0.1 mole fraction [153]. (It should be noted that 0.1 mole fraction octane is equivalent to 21% in methanol.) A 1 pL injection of a standard containing 4 x 10 M metal complex was readily detected. 

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