- Mechanistic studies of olefin metathesis by ruthenium carbene complexes using electrospray ionization tandem mass spectrometry
-
The olefin metathesis reaction of the Grubbs ruthenium carbene complexes has been investigated in the gas phase by electrospray ionization tandem mass spectrometry. Relative rates of reaction for substituted ruthenium benzylidenes and alkylidenes after removal of one phosphine ligand were interpreted with the aid of linear free energy analysis and kinetic isotope effects. The experimental observations are consistent with a reaction profile in which the metallacyclobutane structure is a transition state rather than an intermediate, although alternative explanations cannot be wholly ruled out. Electron withdrawal on the carbene moiety is found to accelerate the metathesis reaction when only the metathesis step itself is examined. Quantum chemical calculations at a variety of levels were performed to check for the consistency of the interpretation.
- Adlhart, Christian,Hinderling, Christian,Baumann, Harold,Chen, Peter
-
-
Read Online
- Efficient stereochemical relay en route to leucascandrolide A.
-
[structure: see text]. A complete relay of the initial stereochemical information is central to the efficient and highly stereocontrolled construction of the C1-C15 fragment of the marine macrolide leucascandrolide A. Cyclic silane 3, assembled via Pt-cat
- Kozmin
-
-
Read Online
- Synthesis of imines from amines in aliphatic alcohols on Pd/ZrO2 catalyst under ambient conditions
-
Synthesis of imines from amines and aliphatic alcohols (C 1-C6) in the presence of base on supported palladium nanoparticles has been achieved for the first time. The catalytic system shows high activity and selectivity in open air at room temperature.
- Cui, Wenjing,Zhaorigetu, Bao,Jia, Meilin,Ao, Wulan,Zhu, Huaiyong
-
p. 2601 - 2604
(2014/01/06)
-
- Fluorinated β-nitro amines by a selective ZrCl4-catalyzed aza-Henry reaction of (E)-trifluoromethyl aldimines
-
ZrCl4 was found to be an ideal catalyst to promote aza-Henry reactions between trifluoromethyl aldimines and some nitro alkanes giving new fluorinated β-nitro amines. The reaction is strongly influenced by the CF3 group, the yield by
- Fioravanti, Stefania,Pellacani, Lucio,Vergari, Maria Cecilia
-
supporting information
p. 8207 - 8210,4
(2012/12/12)
-
- PNP pincer osmium polyhydrides for catalytic dehydrogenation of primary alcohols
-
This paper reports the synthesis, structure, and properties of a series of PNP pincer complexes of osmium OsH3Cl[HN(C2H 4PiPr2)2] (1), OsH 3[N(C2H4PiPr2) 2] (2), OsH4[HN(C2H4P iPr2)2] (3), and OsH2(PMe 3)[HN(C2H4PiPr2) 2] (4). The tetrahydride 3 operates as an efficient catalyst at 0.1 mol% loading for the reactions of amination and dehydrogenative coupling of primary alcohols, producing secondary amines and symmetrical esters, respectively. The catalyst 3 is distinguished by outstanding stability, and it can be used in an aqueous environment at temperatures as high as 200 °C. The Royal Society of Chemistry 2011.
- Bertoli, Marcello,Choualeb, Aldjia,Gusev, Dmitry G.,Lough, Alan J.,Major, Quinn,Moore, Brandon
-
body text
p. 8941 - 8949
(2011/10/12)
-
- PROCESS FOR PRODUCING QUINOLINE COMPOUND
-
By a production method of a quinoline compound represented by the formula (I), which comprises reacting quinolinecarbaldehyde represented by the formula (II) with an imine compound represented by the formula (III) and then subjecting the resulting compoun
- -
-
Page/Page column 6
(2008/06/13)
-
- Synthesis of the 3-methylene-2-vinyltetrahydropyran unit; the hallmark of the sesquiterpene, hodgsonox
-
(Chemical Equation Presented) The synthesis of some simple compounds containing the previously unreported 3-methylene-2-vinyltetrahydropyran system, a unique feature of the liverwort metabolite, hodgsonoxis reported. Key features are the creation of an ac
- Barlow, Anna J.,Compton, Benjamin J.,Weavers, Rex T.
-
p. 2470 - 2475
(2007/10/03)
-
- Nitrogen-heterocyclic compound and process for production thereof
-
A nitrogen-heterocyclic compound is provided which is represented by General Formula (1): where R1and R2are independently hydrogen, an alkyl group, an aryl group, or a heteroaryl group; R3is hydrogen or an aryl group; Rsu
- -
-
Page column 16
(2010/01/30)
-
- Synthesis of 5,7-Dichloro-2H-1-benzopyran-2-ol
-
The reaction of 4,6-dichloro-2-(methylthiomethoxy)cinnamaldehyde (3) or 4,6-dichloro-2-hydroxycinnamaldehyde (5) with mercuric chloride in hot aqueous acetonitrile gave 5,7-dichloro-2H-1-benzopyran-2-ol (4) in good yield.
- Stokker, G. E.
-
p. 609 - 610
(2007/10/02)
-