Regiocontrol of Cyclometalation in a P4Ru(II) System. Unusual Base-Induced Metalation within a Chelate Ring versus Activation of a Methyl Group
摘要:
The internally cyclometalated complex (MeSi-(CH2PMe2)(2)CHPMe2)(PMe3)RuH has been prepared by the treatment of MeSi(CH2PMe2)(3)PMe3Ru(H)(Cl) with base, and an analogue has been structurally characterized by X-ray diffraction. The externally cyclometalated isomer MeSi(CH2PMe2)(3)PMe2CH2RuH has been cleanly generated by the thermolysis of MeSi(CH2PMe2)(3)PMe3-Ru(H)(Me), and the two isomers have been contrasted in terms of their spectroscopic features, calculated energies, and relative reactivities toward cresol and H-2. The two isomers are surprisingly resistant to interconversion. A chloride derivative, (MeSi(CH2PMe2)(2)CHPMe2)(PMe3)-RuCl, has also been prepared, and its reactivity has shown the internally cyclometalated framework to be surprisingly stable.
Zinc-Mediated Efficient and Selective Reduction of Carbonyl Compounds
作者:Tirtha Mandal、Snehasish Jana、Jyotirmayee Dash
DOI:10.1002/ejoc.201700887
日期:2017.9.8
Simple yet unknown! Aldehydes and ketones can be easily reduced to the corresponding alcohols with Zn/NH4Cl, which is used for pinacol coupling reactions. Chemoselective reduction of aldehydes in the presence of ketones is achieved. Isatins can be efficiently reduced at the C3 position.
AKHTAR M. N.; BOYD D. R.; NEILL J. D.; JERINA D. M., J. CHEM. SOC., PERKIN TRANS., 1980, PART 1, NO 8, 1693-1699
作者:AKHTAR M. N.、 BOYD D. R.、 NEILL J. D.、 JERINA D. M.
DOI:——
日期:——
PATRICK, T. B.;WILLAREDT, R. P.;DEGONIA, D. J., J. ORG. CHEM., 1985, 50, N 13, 2232-2235
作者:PATRICK, T. B.、WILLAREDT, R. P.、DEGONIA, D. J.
DOI:——
日期:——
NOVOLAC-BASED EPOXY COMPOUND, PRODUCTION METHOD FOR SAME, COMPOSITION AND CURED ARTICLE COMPRISING SAME, AND USE FOR SAME
申请人:KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGY
公开号:US20150203626A1
公开(公告)日:2015-07-23
A novolac epoxy compound having an alkoxysilyl group of which composite has low CTE and increase of glass transition temperature, and requiring no coupling agent, a production method thereof, an epoxy composition including the same and a cured article thereof, are provided. A novolac epoxy compound having an alkoxysilyl group of Formulae I-1 to I-4, a production method of the novolac epoxy compound having an alkoxysilyl group by the epoxidation, alkenylation and alkoxysilylation of a novolac epoxy compound, a production method of the novolac epoxy compound having an alkoxysilyl group by the epoxidation and alkoxysilylation of a novolac epoxy compound, an epoxy composition including the novolac epoxy compound having an alkoxysilyl group, and a cured article, are provided. The cured article, i.e., the composite of the epoxy composition has improved chemical bonding efficiency due to alkoxysilyl groups. Low CTE and high glass transition temperature are exhibited
NOVEL NOVOLAC CURING AGENT WITH ALKOXYSILYL GROUP, METHOD FOR PREPARING THE SAME, COMPOSITION CONTAINING THE SAME, THE CURED PRODUCT, AND USE THEREOF
申请人:KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGY
公开号:US20160326299A1
公开(公告)日:2016-11-10
A new novolac curing agent with an alkoxysilyl group exhibiting excellent heat resistance such as a low CTE and an high Tg when a composite is formed, a preparing method of the same, a composition including the same, a cured article, and an use thereof, are provided. The new novolac curing agent having an alkoxysilyl group of Formulae I-1 to I-4, a preparing method of the new novolac curing agent by alkenylation and alkoxysilylation of the novolac curing agent, a preparing method of the new novolac curing agent by alkoxysilylation of a novolac curing agent, a composition including a novolac curing agent having an alkoxysilyl group of Formulae I-1 to I-4, a cured article and a use thereof, are provided. A composite including a novel novolac curing agent having an alkoxysilyl group exhibits a low CTE and a high glass transition temperature.