One-step synthesis of ketones from car☐ylic acids and grignard reagents in the presence of a nickel(II)-phosphine catalyst.
作者:V. Fiandanese、G. Marchese、L. Ronzini
DOI:10.1016/s0040-4039(00)88199-x
日期:1983.1
A one-step synthesis of diaryl and alkyl-aryl ketones by the reaction of car☐ylic acid with Grignard reagents in the presence of NiCl2(Ph2PCH2CH2PPh2) as catalyst is described. In the nickel-catalyzedGrignardreaction the formation of alcohols is nearly completely suppressed.
Fast Addition of s‐Block Organometallic Reagents to CO
<sub>2</sub>
‐Derived Cyclic Carbonates at Room Temperature, Under Air, and in 2‐Methyltetrahydrofuran
作者:David Elorriaga、Felipe Cruz‐Martínez、María Jesús Rodríguez‐Álvarez、Agustín Lara‐Sánchez、José Antonio Castro‐Osma、Joaquín García‐Álvarez
DOI:10.1002/cssc.202100262
日期:2021.5.6
straightforward synthesis of: highly substituted tertiary alcohols, β‐hydroxy esters, or symmetric ketones, working always under air and at room temperature. Finally, an unprecedented one‐pot/two‐step hybrid protocol is developed through combination of an Al‐catalyzed cycloaddition of CO2 and propylene oxide with the concomitant fast addition of RLi reagents to the in situ and transiently formed cyclic carbonate
aliphatic alcohols at unactivated β-, γ-, and δ-C(sp3 )-H sites. The use of an easily installed/removed Si-based auxiliary enablesselective I-atom/radical translocation events at remote C-H sites followed by the Heck reaction. Notably, the reaction proceeds smoothly under mild visible-light-mediated conditions at room temperature, producing highly modifiable and valuable alkenol products from readily available
Reactivity of mixed organozinc and mixed organocopper reagents: 12 . Three component reaction of mixed (n-alkyl)(diaryl)zincates, chloroformates and phosphines for the synthesis of esters
作者:Duygu Özkan、Ender Erdik
DOI:10.1016/j.jorganchem.2015.08.012
日期:2015.12
The reaction of mixed n-butyldiphenylzincate, n-BuPh2ZnMgBr with ethyl chloroformate, ClCOOEt in the presence n-Bu3P in THF takes place with quantitative yield and phenyl group transfer to give PhCOOEt. Ethoxycarbonylation of n-BuPh2ZnMgBr is preferable to the reaction of PhMgBr forming ester and triphenylcarbinol and also to the reaction of triphenylzincate, Ph3ZnMgBr for atom economy. Group selectivity
Process for Production of Alkyl Tin Alkoxide Compound, and Process for Production of Carbonic Acid Ester Using the Compound
申请人:Shinohata Masaaki
公开号:US20100292496A1
公开(公告)日:2010-11-18
The present invention provides a process for producing: a compound represented by XOR
2
; a dialkyl tin dialkoxide compound having one tin atom, two Sn—R
1
bonds and two Sn—OR
2
bonds; and/or a tetraalkyl dialkoxy distannoxane compound having one Sn—O—Sn bond, in which each tin atom of the tetraalkyl dialkoxy distannoxane compound has two Sn—R
1
bonds and one Sn—OR
2
bond, the process comprising reacting in the absence of a catalyst at least one alkyl tin compound selected from the group consisting of i) and ii) below:
i) a dialkyl tin compound having one tin atom, two Sn—R
1
(wherein R
1
represents an alkyl group) bonds, and two Sn—OX bonds (wherein OX is a group in which HOX that is a conjugate acid of OX is a Bronsted acid having a pKa of from 0 to 6.8); and
ii) a tetraalkyl distannoxane compound having one Sn—O—Sn bond, in which each tin atom of the tetraalkyl distannoxane compound has two Sn—R
1
bonds and one Sn—OX bond (wherein OX is a group in which HOX that is a conjugate acid of OX is a Bronsted acid having a pKa of from 0 to 6.8); and
a carbonic acid ester represented by R
2
OCOOR
2
(wherein R
2
represents a linear or branched, saturated or unsaturated hydrocarbon group, a hydrocarbon group having a saturated or unsaturated cyclic hydrocarbon substituent, or a Y—CH
2
— group (wherein Y represents an alkyl polyalkylene group, an aromatic group or a cyclic saturated or unsaturated alkylene ether group)), and/or
an alcohol represented by R
2
OH (wherein R
2
is the same as defined above).