Showing papers on "Acetonitrile published in 1988"
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TL;DR: In this paper, it was shown that cyclotriborazane and borazine can be formed in 0.15 M NH3BH3 in diglyme at 130 °C.
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TL;DR: In this article, the authors showed that the reaction of polymeric dianions with CuCl and KSCN (or NH 4 SCN) in acetone or acetonitrile can give a new set of mixed metal-sulfur compounds.
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TL;DR: In this article, the binucleating ligands are used for catalyse hydration of acetonitrile, the acid dependence indicates a bimetallic pathway involving concerted action by the two metals and L*Pd2(CH2CHCONH) catalyses specific hydration for acrylonitrile to acrylamide.
Abstract: LPd2(MeCONH) and L*Pd2(MeCONH), where L and L* are the binucleating ligands in (1) and (2), respectively, both catalyse hydration of acetonitrile, the acid dependence of which indicates a bimetallic pathway involving concerted action by the two metals and L*Pd2(CH2CHCONH) catalyses specific hydration of acrylonitrile to acrylamide.
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TL;DR: In this article, cyclic voltammetry in MeCN at various temperatures and pressures, including supercritical conditions, is described, and diffusion coefficients of phenanzine and ferrocene up to Tc are reported, and the determination of viscosity of high temperature/high pressure liquids and fluids based on measurements of D via the Stokes-Einstein equation is suggested.
TL;DR: In situ infrared spectroelectrochemistry has been used to observe electrolyte/solvent breakdown processes in TBAF/acetonitrile at a platinum electrode as discussed by the authors.
Abstract: In situ infrared spectroelectrochemistry has been used to observe electrolyte/solvent breakdown processes in TBAF/acetonitrile at a platinum electrode. Anodic breakdown gives the adduct CH3CNBF3 as...
TL;DR: In this article, a reaction of 2,2′-bithiophene with copper(II) perchlorate in acetonitrile achieved polymerization and doping in one step, and yielded polythiophenes, [(C4H2S)(ClO4)x·yH2O]n.r.
TL;DR: In this paper, the complexation reactions of crown ethers with monovalent cations and Ba2+ were studied in acetonitrile solutions by means of calorimetric and potentiometric titration.
Abstract: The complexation reactions of crown ethers with monovalent cations and Ba2+ were studied in acetonitrile solutions by means of calorimetric and potentiometric titration. The reaction enthalpies measured clearly demonstrate the influence of the interactions between 18-crown-6 and the acetonitrile solvent molecules. Changing the donor atoms or other substituents on the ligand molecule can exert a strong influence on the interactions with the solvent. Thus, all the reaction enthalpies measured for the reaction of 15-crown-5 with different cations are higher compared with 18-crown-6. On comparison with results in methanol, an approximate estimation is made of the influence of solvent molecules on the reaction enthalpies measured in acetonitrile. Due to the strong interaction between silver ion and acetonitrile, complex formation is only observed with crown ethers containing additional nitrogen or sulphur donor atoms.
TL;DR: In this paper, a thermodynamic comparison of the retention of four polycyclic aromatic hydrocarbons on a monomeric and a polymeric reversed-phase column using methanol and acetonitrile is presented.
TL;DR: Alcohols can be easily transformed to their corresponding methylthiomethyl ethers under mild conditions by treatment with methyl sulfide and benzoyl peroxide in acetonitrile as discussed by the authors.
TL;DR: In this article, the polypyrrole-chlorine (PPY-Cl2) complex is shown to have a room-temperature direct-current (d.c.) electrical conductivity that varies from <10−7 to 0.5 S cm−1 depending on the solvent medium used for polymerization.
TL;DR: In this paper, a comparison of transfer activity coefficients between propylene carbonate and solvent S2 of alkali or silver ions complexed with dibenzo-substituted crown ethers (L=DB-18cr-6, DB-21cr-7, DB24cr-8, DB30-cr-10KBr) was made, and it was concluded that the outer solvent shell is stripped upon formation of the ligand separated ion pair.
Abstract: From a comparison of transfer activity coefficients, [γ(LM+)]PC,2 between propylene carbonate and solvent S2 of alkali or silver ions complexed with dibenzo-substituted crown ethers (L=DB-18-cr-6, DB-21-cr-7, DB-24-cr-8, DB-30-cr-10) it can be concluded that in the complex LM+ both L and M+ are solvated, particularly in solvents of high donicity, e.g., N,N-dimethylformamide. From the abnormally low ionic mobility of DB-30-cr-10K+ in acetonitrile and the high value of the association constant of the ion pair DB-30-cr-10KBr it is concluded that the outer solvent shell is stripped upon formation of the ligand separated ion pair. A linear relation is found between [log γ(LM+)]PC,2 and [logγ(M+)]PC,2 only when L is 18-cr-6, B-18-cr-6, or DB-18-cr-6. Deviation from the linearity of complexes of the larger dibenzo crown ethers is attributed to the flexibility of L. It is shown that solution of 18-cr-6, DB-18-cr-6 and DB-30-cr-10 is enthalpy assisted to a greater extent in acetonitrile than in methanol, while the entropy of solution is more favorable in the latter.
TL;DR: The results of group transfer polymerization of methyl methacrylate (MMA) in acetonitrile with tetraethylammonium cyanide (Et4NCN) and tris(dimethylamino)sulfonium difluorotrimethylsilicate (TASF2SiMe3) as catalysts and trimethylsilyl cyanide as initiator are presented in this paper.
Abstract: Results of group transfer polymerization of methyl methacrylate (MMA) in acetonitrile with tetraethylammonium cyanide (Et4NCN) and tris(dimethylamino)sulfonium difluorotrimethylsilicate (TASF2SiMe3) as catalysts and trimethylsilyl cyanide as initiator are presented It is shown, that both catalysts behave similarly with respect to catalysis of the initiation and the propagation step and of the termination step of the growing chains with the solvent, TASF2SiMe3 being more active than Et4NCN
TL;DR: Lanthanum and yttrium trifluoromethanesulfonates at 1 mole % concentration, have been found to catalyze a reaction between ammonia and aromatic nitriles to yield symmetrically substituted 2,4,6-triaryl-s-triazines.
TL;DR: The square planar S4 donor complex [Pd(L1)]2+(L1= 7,16-dimethyl-1,4,10,13-tetrathia-7, 16-diazacyclo-octadecane) showed a reversible PdII/I redox couple at E½−0.57 V vs. Fc/Fc+; in contrast, the complex as discussed by the authors showed distorted octahedral N2S2+ S2 co-ordination.
Abstract: The square planar S4 donor complex [Pd(L1)]2+(L1= 7,16-dimethyl-1,4,10,13-tetrathia-7,16-diazacyclo-octadecane) shows a reversible PdII/I redox couple at E½–0.74 V vs. Fc/Fc+; in contrast, the complex [Pd(L2)]2+(L2= 1,4,10,13-tetrathia-7,16-diazacyclo-octadecane) shows distorted octahedral N2S2+ S2 co-ordination, and a reversible PdII/III couple at E½+0.57 V vs. Fc/Fc+(ferrocene/ferrocinium).
TL;DR: In this article, a single crystal X-ray analysis of the 2:1 acetonitrile complex of 18crown-6 is reported, which lies on a center of symmetry, with the crown in theD3d conformation.
Abstract: Single crystal X-ray analysis of the 2:1 acetonitrile complex of 18-crown-6 is reported. Crystals of the complex are monoclinic,P21/n, witha=9.123(3),b=8.524(3),c=13.676(4) A, β=104.68(3)°, andD c =1.118 g cm−3 forZ=2. The complex lies on a center of symmetry, with the crown in theD3d conformation. Methyl groups of the acetonitrile molecules have weak interactions with the crown oxygen atoms, and are tilted 31.7° from the host's threefold axis. Methyl hydrogen atoms are rotationally disordered about the acetonitrile axis.