1990-24-5Relevant articles and documents
Structural, magnetic, and electronic properties of phenolic oxime complexes of Cu and Ni
Whyte, Alexander M.,Roach, Benjamin,Henderson, David K.,Tasker, Peter A.,Matsushita, Michio M.,Awaga, Kunio,White, Fraser J.,Richardson, Patricia,Robertson, Neil
experimental part, p. 12867 - 12876 (2012/03/07)
Square planar complexes of the type Ni(L1)2, Ni(L2)2, Cu(L1)2, and Cu(L 2)2, where L1H = 2-hydroxy-5-t- octylacetophenone oxime and L2H = 2-hydroxy-5-n-propylacetophenone oxime, have been prepared and characterized by single-crystal X-ray diffraction, cyclic voltammetry, UV/vis spectroscopy, field-effect-transistor measurements, density functional theory (DFT) and time-dependent DFT (TDDFT) calculations, and, in the case of the paramagnetic species, electron paramagnetic resonance (EPR) and magnetic susceptibility. Variation of alkyl groups on the ligand from t-octyl to n-propyl enabled electronic isolation of the complexes in the crystal structures of M(L1)2 contrasting with π-stacking interactions for M(L2)2 (M = Ni, Cu). This was evidenced by a one-dimensional antiferromagnetic chain for Cu(L2)2 but ideal paramagnetic behavior for Cu(L1)2 down to 1.8 K. Despite isostructural single crystal structures for M(L2) 2, thin-film X-ray diffraction and scanning electron microscopy (SEM) revealed different morphologies depending on the metal and the deposition method (vapor or solution). The Cu complexes displayed limited electronic interaction between the central metal and the delocalized ligands, with more mixing in the case of Ni(II), as shown by electrochemistry and UV/vis spectroscopy. The complexes M(L2)2 showed poor charge transport in a field-effect transistor (FET) device despite the ability to form π-stacking structures, and this provides design insights for metal complexes to be used in conductive thin-film devices.
Regioselective synthesis of 5-alkylsalicylates, 5-alkyl-2-hydroxy- acetophenones, and 5-alkyl-2-hydroxy-benzophenones by [3 + 3] cyclization of 1,3-bis(silyl enol ethers) with 2-alkyl-1,1,3,3-tetraethoxypropanes
Mamat, Constantin,Buettner, Stefan,Trabhardt, Tiana,Fischer, Christine,Langer, Peter
, p. 6273 - 6275 (2008/02/10)
(Chemical Equation Presented) A variety of 5-alkylsalicylates, 5-alkyl-2-hydroxy-acetophenones, and 5-alkyl-2-hydroxy-benzophenones was regioselectively prepared by TiCl4 mediated formal [3 + 3] cyclization of 1,3-bis(silyl enol ethers) with 2-alkyl-1,1,3,3- tetraethoxypropanes.
Process for synthesis of 5-alkylbenzodioxoles
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, (2008/06/13)
The following description refers to a new process for the synthesis of 5-alkylated benzo[1,3]dioxole, comprising the following steps in sequence: catalytic hydrogenation of 4-acylphenol; acylation; displacement catalysed by Lewis acids; treatment with an inorganic basic compound and hydrogen peroxide; reaction with alkyl dihalides or dialkoxyalkanes. The process described herein, which yields 5-alkylbenzo[1,3]dioxoles, is economic and can be easily scaled up to industrial size.
