Uranium(VI) Bis(imido) Chalcogenate Complexes: Synthesis and Density Functional Theory Analysis
摘要:
Bis(imido) uranium(VI) trans- and cis-dichalcogenate complexes with the general formula U((NBu)-Bu-t)(2)(EAr)(2)(OPPh3)(2) (EAr = O-2-(BuC6H4)-Bu-t, SPh, SePh, TePh) and U((NBu)-Bu-t)(2)(EAr)(2)(R(2)bpy) (EAr = SPh, SePh, TePh) (R(2)bpy = 4,4'-disubstituted-2,2'-bipyridyl, R = Me, Bu-t) have been prepared. This family of complexes includes the first reported monodentate selenolate and tellurolate complexes of uranium(VI). Density functional theory calculations show that covalent interactions in the U-E bond increase in the trans-dichalcogenate series U(NtBu)(2)(EAr)(2)(OPPh3)(2) as the size of the chalcogenate donor increases and that both 5f and 6d orbital participation is important in the M-E bonds of U-S, U-Se, and U-Te complexes.
PROCESS FOR PRODUCING POLYCARBONATES AND A COORDINATION COMPLEX USED THEREFOR
申请人:SK INNOVATION CO., LTD.
公开号:US20140249323A1
公开(公告)日:2014-09-04
The complex of the present invention containing an onium salt and a central Lewis acidic metal has a high catalytic activity at a high temperature for the copolymerization of an epoxide and carbon dioxide to produce a high molecular weight polycarbonate.
Carbamates with Differential Mechanism of Inhibition Toward Acetylcholinesterase and Butyrylcholinesterase
作者:Sultan Darvesh、Katherine V. Darvesh、Robert S. McDonald、Diane Mataija、Ryan Walsh、Sam Mothana、Oksana Lockridge、Earl Martin
DOI:10.1021/jm8002075
日期:2008.7.1
Most carbamates are pseudoirreversible inhibitors of cholinesterases. Phenothiazine carbamates exhibit this inhibition of acetylcholinesterase but produce reversible inhibition of butyrylcholinesterase, suggesting that they do not form a covalent bond with the catalytic serine. This atypical inhibition is attributable to pi-pi interaction of the phenothiazine moiety with F329 and Y332 in butyrylcholinesterase
Achieving conformational control over C–C, C–N and C–O bonds in biaryls, N,N′-diarylureas and diaryl ethers: advantages of a relay axis
作者:Mark S. Betson、Ann Bracegirdle、Jonathan Clayden、Madeleine Helliwell、Andrew Lund、Mark Pickworth、Timothy J. Snape、Christopher P. Worrall
DOI:10.1039/b614618j
日期:——
The orientation of ArâC, ArâN and ArâO bonds in biaryls, N,Nâ²-diarylureas and diaryl ethers (whose conformers are distinguishable by NMR) may be controlled with a selectivity up to >95 : 5 by an adjacent stereogenic centre; the selectivity may be greater when a second stereogenic axis is inserted between the controlling centre and the slowly rotating bond.
Process for carboxylating organic substrates with carbon dioxide in
申请人:Montedison S.p.A.
公开号:US03976677A1
公开(公告)日:1976-08-24
Carboxylable substrates i.e., ketones, esters, nitroparaffins and nitriles, containing activated hydrogen atoms are carboxylated by reaction with alkaline phenates and CO.sub.2 in at least one hydrocarbon solvent selected from aliphatic, alicyclic, aromatic and alkyl-aromatic hydrocarbon solvents.
METHOD FOR PRODUCING A 3-(SUBSTITUTED-OXY)-4-PYRIDAZINOL DERIVATIVE
申请人:Ikishima Hideaki
公开号:US20120184736A1
公开(公告)日:2012-07-19
Disclosed is a method for producing a 3-(substituted oxy)-4-pyridazinol derivative represented by the general formula (I), which comprises reacting a compound represented by the general formula (III) with a compound represented by the general formula (IV) in the presence or absence of a base and in the presence or absence of a solvent. According to the present invention, a 3-(substituted oxy)-4-pyridazinol derivative represented by the general formula (I) can be produced in high yield and with high selectivity.