Process for producing an alcohol or its silyl ether
申请人:Takasago International Corporation
公开号:EP1698609A1
公开(公告)日:2006-09-06
There is provided a process for producing an alcohol or its silyl ether represented by the formula (4):
wherein R1 represents a hydrocarbon group, a heterocyclic group, or an alkoxycarbonyl group; R2 represents a hydrogen atom or CO2R; X represents an aryl group or an alkenyl group represented by the following general formula (3):
and R8 represents a hydrogen atom or a silyl residue, by reacting a compound represented by the formula (1):
R1(C=O)R2 (1)
wherein R1 and R2 are the same as defined above, with a silane represented by the formula (2):
(R3)2R4Si-X (2)
wherein R3 and R4 each represents an alkyl group, an alkoxy group, or an aryl group; and X is the same as defined above, in the presence of (i) a catalyst component containing copper fluoride, or a copper compound and a fluoride, and (ii) a bidentate phosphine compound or in the presence of a complex obtained from the foregoing components.
Halogen Photoelimination from Monomeric Nickel(III) Complexes Enabled by the Secondary Coordination Sphere
作者:Seung Jun Hwang、Bryce L. Anderson、David C. Powers、Andrew G. Maher、Ryan G. Hadt、Daniel G. Nocera
DOI:10.1021/acs.organomet.5b00568
日期:2015.10.12
Endothermic halogen elimination reactions, in which molecular halogen photoproducts are generated in the absence of chemical traps, are rare. Inspired by the proclivity of mononuclear Ni(III) complexes to participate in challenging bond-forming reactions in organometallic chemistry, we targeted Ni(III) trihalide complexes as platforms to explore halogen photoelimination. A suite of Ni(III) trihalide complexes supported by bidentate phosphine ligands has been synthesized and characterized. Multinuclear NMR, EPR, and electronic absorption spectroscopies, as well as single-crystal X-ray diffraction, have been utilized to characterize this suite of complexes as distorted square pyramidal, S = 1/2 mononuclear Ni(III) complexes. All complexes participate in clean halogen photoelimination in solution and in the solid state. Evolved halogen has been characterized by mass spectrometry and quantified chemically. Energy storage via halogen elimination was established by solution-phase calorimetry measurements; in all cases, halogen elimination is substantially endothermic. Time-resolved photochemical experiments have revealed a relatively long-lived photointermediate, which we assign to be a Ni(II) complex in which the photoextruded chlorine radical interacts with a ligand-based aryl group. Computational studies suggest that the observed intermediate arises from a dissociative LMCT excited state. The participation of secondary coordination sphere interactions to suppress back-reactions is an attractive design element in the development of energy-storing halogen photoelimination involving first-row transition metal complexes.
US7563916B2
申请人:——
公开号:US7563916B2
公开(公告)日:2009-07-21
Process for producing an alcohol or a silyl ether thereof
申请人:Shibasaki Masakatsu
公开号:US20060199973A1
公开(公告)日:2006-09-07
A process for producing an alcohol or a silyl ether thereof of formula (4):
wherein R
1
represents a hydrocarbon, a heterocyclic, or an alkoxycarbonyl group; R
2
represents hydrogen or CO
2
R; X represents an aryl or an alkenyl group of formula (3):
and R
8
represents hydrogen or a silyl residue, by reacting a compound R
1
(C═O)R
2
with a silane (R
3
)
2
R
4
Si—X, wherein R
3
and R
4
each represents an alkyl, an alkoxy, or an aryl group; in the presence of (i) a catalyst component containing copper fluoride or a catalyst component containing a copper compound and a fluoride and (ii) a bidentate phosphine compound or in the presence of a complex obtained from the foregoing components.
The preparation and properties of some diphosphines R2PCH2CH2PR2(R = alkyl or aryl) and of their rhenium(I) dinitrogen derivatives
作者:Joseph Chatt、Wasif Hussain、G. Jeffery Leigh、Hapipah Mohd. Ali、Christopher J. Picket、Douglas A. Rankin
DOI:10.1039/dt9850001131
日期:——
The synthesis of a range of diphosphines R2PCH2CH2PR2 from Cl2PCH2CH2PCl2 is described. The properties of a series of complexes [ReCl(N2)(R2PCH2CH2PR2)2] derived from them are discussed. The relationship between the values of E½ox and ν(N2) for the complexes suggests that electron-withdrawing substituents on the diphosphine upset the usual balance of σ and π effects in rhenium–dinitrogen bonding.