探索了结合到多壁碳纳米管上的季铵氯化物,作为CO 2和环氧化物偶联生成环状碳酸酯的催化剂。讨论了环氧化物结构,季铵盐中烷基取代基的长度和间隔链等反应变量对催化性能的影响。在110°C低压(2 MPa CO 2)下放置6 h后,环状碳酸酯的收率在7%至89%之间变化。环氧化物:催化剂的质量比为20–30,而1 mmol g -1季盐被接枝在碳纳米管上。发现了接枝到碳纳米管上的羧基部分和铵部分之间的协同作用,并且观察到用于接枝季铵盐的间隔基团的长度对纳米管的强烈影响。使用短(2个碳原子)和长(10个原子)间隔基可获得最佳性能,而中等大小的间隔基(6个原子)不合适。铵盐(头基)的取代基的烷基链长度影响较小,其中乙基和甲基的性能优于丁基。环氧化物的反应性如下:表氯醇>环氧丙烷>氧化苯乙烯。观察通过Brønsted' 纳米管表面上的S位在环氧化物的羧化过程中起重要作用。如果在两次试验之间适当干燥,则
Taskspecific ionic liquids and onium salts have been used as solublesupports for peptide synthesis. These new supports combine easy monitoring, high loading capacities, large scale preparation, and homogeneous kinetics characteristics while keeping advantages of solid-phase synthesis including easy purification and workup. Careful structural design of these supports allowed for fine tuning of physical
Use of functionalized onium salts as a soluble support for organic synthesis
申请人:Vaultier Michel
公开号:US20070043234A1
公开(公告)日:2007-02-22
The invention relates to the use of a onium salt functionalized by at least one organic function, as a soluble support, in the presence of at least one organic solvent, for organic synthesis of a molecule, in a homogenous phase, by at least one transformation of said organic function. The onium salt enables the synthesized molecule to be released. The onium salt is present in liquid or solid form at room temperature and corresponds to formula A
1
+
, X
1
−
, wherein A
1
+
represents a cation and X
1
−
represents an anion.
Compositions containing ionic liquids and their uses, in particular in organic synthesis
申请人:Vaultier Michel
公开号:US09452425B2
公开(公告)日:2016-09-27
An ionic liquid is used as liquid matrix for organic synthesis in homogeneous phase on soluble support, the ionic liquid being presented in liquid or solid form at ambient temperature, of formula A1+X1−, A1+ representing a cation, functional or non-functional, or a mixture of cations in which either none of the cations is functional or at least one of the cations is functional, and X1− an anion, functional or non-functional, or a mixture of anions in which either none of the anions is functional or at least one of the anions is functional.
Abstract The utilization of the taskspecificoniumsaltsupported substrates in ionic liquids as solvents (i.e., binary taskspecific ionic liquids) for palladium nanoparticle catalyzed Heck cross-coupling reactions is presented. Adequate substrates have been prepared and used leading to expected products in very high yields. Exceptionally high turnover (TON = 940,000, TOF = 208,000) can be achieved
Use of Functionalized Onium Salts for Peptide Synthesis
申请人:Vaultier Michel
公开号:US20100292439A1
公开(公告)日:2010-11-18
A subject of the invention is the use of a salt with a dedicated task of formula (I):
A
+
-L-R—OY, X
−
as soluble support for peptide synthesis, in which:
X
−
represents a functional or non-functional anion,
Y represents either a hydrogen atom, or a —COOR
1
group, R
1
representing in particular an alkyl group comprising 1 to 20 carbon atoms,
A
+
represents a cationic entity,
L represents an arm, in particular an alkyl group of 3 to 20 carbon atoms,
R represents in particular a group of formula —C(R
a
)(R
b
)—, R
a
and R
b
representing independently of one another in particular a hydrogen or an alkyl group, comprising 1 to 20 carbon atoms.