PROCESS FOR PRODUCING ORGANOLITHIUM COMPOUND AND PROCESS FOR PRODUCING SUBSTITUTED AROMATIC COMPOUND
申请人:Inoue Hiroki
公开号:US20110224457A1
公开(公告)日:2011-09-15
A method for producing an organolithium compound includes the step of reacting an aromatic compound or a halogenated unsaturated aliphatic compound and a lithiating agent in the presence of a coordinating compound containing three or more elements having a coordinating ability in a molecule, at least one thereof being a nitrogen element, or a coordinating compound containing three or more oxygen elements having a coordinating ability in a molecule, at least one of the groups containing the oxygen elements having a coordinating ability being a tertiary alkoxy group, at a temperature of −40° C. to 40° C.
The reaction in phase-transfer catalyzed conditions of 3(5)-methyl-1H-pyrazole with chloroform affords four isomers 333, 335, 355 and 555 in proportions corresponding to the polynomial expansion (a + b)³, with a = 0.6 and b = 0.4, a and b being 3-methyl and 5-methyl proportions. The up (u) and down (d) conformation of the pyrazolyl rings with regard to the Csp³⁻H atom was established by X-ray crystallography
Catalyst for trimerization of ethylene and process for trimerizing ethylene using the catalyst
申请人:TOSOH CORPORATION
公开号:US20020035029A1
公开(公告)日:2002-03-21
A catalyst used for trimerization of ethylene into 1-hexene is descrobed, which comprises (i) a specific organometallic complex having a neutral multidentate ligand having a tripod structure, (ii) an alkylaluminoxane, and an optional ingredient selected from:
(iii) a halogenated inorganic compound,
(iv) a specific alkyl group-containing compound,
(v) a combination of a halogenated inorganic compound with a specific alkyl group-containing compound,
(vi) an amine compound and/or an amide compound, and
(vii) a combination of an amine compound and/or an amide compound with a specific alkyl group-containing compound.
Iron complexes of tris(pyrazolyl)ethane ligands methylated in the 3-, 4-, and 5-positions
作者:Margaret A. Goodman、Michael J. DeMarco、Steven E. Tarasek、Alexander Y. Nazarenko、William Brennessel、M. Scott Goodman
DOI:10.1016/j.ica.2014.08.046
日期:2014.11
Four tris(pyrazolyl)ethane (tpe) ligands were synthesized from tris(pyrazolyl)methane (tpm) starting materials. The new tpe ligands differ only in the placement of methyl groups on the pyrazole rings. For each tpe ligand, the 2:1 complex with Fe(II) was readily synthesized and the structures were determined by X-ray crystallography and characterized more completely by Fe-57 Mossbauer spectroscopy, H-1 NMR, and UV-Vis spectroscopy. The complexes all contain Fe(II) in the low spin (LS) state at low temperatures, but differ in Fe-N bond lengths and spectroscopic parameters. Methyl groups in the 5-position of the pyrazoles of the tpe ligand close the bite of the ligand, strengthening the ligand field and shifting the visible absorbance band of the complex to higher energies. Methyls in the 4-position had almost no effect on the ligand, making the iron(II) complex almost indistinguishable from that of the parent tpe ligand. Methyl groups in the 3-position of the tpe ligand cause an opening of the bite of the ligand, which is evidenced by increased Fe-N bond lengths in the complex and a shift of the visible absorbance to lower energies. The complex with methyls in the 3-position also starts to display spin crossover behavior near room temperature, whereas the other tpe complexes do not. (C) 2014 Elsevier B.V. All rights reserved.
JULIA, S.;DEL, MAZO, J. M.;AVILA, L.;ELGUERO, J., ORG. PREP. AND PROCED. INT., 1984, 16, N 5-6, 299-307
作者:JULIA, S.、DEL, MAZO, J. M.、AVILA, L.、ELGUERO, J.