Examples of 'lewis acid catalyst' in a sentence
Meaning of "lewis acid catalyst"
lewis acid catalyst ~ A chemical compound or substance that is capable of accepting an electron pair from another substance during a chemical reaction. Lewis acid catalysts are used to speed up certain reactions by facilitating the formation of new chemical bonds
How to use "lewis acid catalyst" in a sentence
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lewis acid catalyst
It may be a Lewis acid catalyst or an alkaline catalyst.
The catalyst is preferably a Lewis acid catalyst.
A preferred Lewis acid catalyst is zinc chloride.
Macromers are usually prepared in the presence of a Lewis acid catalyst.
A particularly preferred Lewis acid catalyst is dibutyltin oxide.
The Lewis acid catalyst may be a metal triflate.
The coupling reaction is conducted using a Lewis acid catalyst.
A Lewis acid catalyst is preferably employed in the reaction.
Scandium triflate is sometimes used as a Lewis acid catalyst in organic chemistry.
The Lewis acid catalyst is preferably soluble in the solvent used.
The second catalyst employed in the present invention is a Lewis acid catalyst.
The presence of a Lewis acid catalyst facilitates the coupling reaction.
This object is achieved according to the invention by using a Lewis acid catalyst.
Examples of the Lewis acid catalyst include titanium tetraisopropoxide and the like.
The reaction of the invention is carried out in the presence of a Lewis acid catalyst.
See also
Olefin metathesis Lewis acid catalyst systems have been extensively reported in the prior art.
In the preparation of the polymer the imide is complexed with a Lewis Acid catalyst.
One preferred Lewis acid catalyst for use in this reaction is boron trifluoride diethyl etherate.
Cationic polymerization of terpenes may be achieved by treating the terpene with a Lewis acid catalyst.
A suitable Lewis Acid catalyst can then be added while cooling is maintained.
The catalyst is preferably a classical Broensted acid or Lewis acid catalyst.
A preferred Lewis acid catalyst was found to be MoCl5.
The catalyst is preferably a classical Bronsted acid or Lewis acid catalyst.
As Friedel-Crafts Lewis acid catalyst anhydrous aluminium chloride is added.
This polymerization can be carried out by means of a Lewis Acid catalyst.
A preferred Friedel-Crafts Lewis acid catalyst is anhydrous aluminium trichloride.
There is little or no interference between neighboring immobilized Lewis Acid catalyst sites.
However, the Lewis acid catalyst is not limited to the above compounds.
Compounds represented by MX'p can be used as the Lewis acid catalyst.
Preferably the Lewis acid catalyst is aluminum chloride, and the organic base is a trialkylamine.
In one embodiment, the catalyst may be a Lewis acid catalyst.
A FRIEDEL-CRAFTS or Lewis Acid catalyst is then added to the mixture.
The hair straightening composition of claim 9, further comprising a Lewis acid catalyst.
The process of claim 1 wherein the Lewis acid catalyst is an aluminum halide.
A method according to Claim 1 wherein said acid catalyst is a Lewis acid catalyst.
The amount of Lewis acid catalyst employed ranges from between about 0.1 to 5 equivalents.
The process of claim 3 wherein the Lewis acid catalyst is zinc chloride.
A crosslinking agent comprising a non-formaldehyde aldehyde ; and optionally a Lewis acid catalyst.
A preferred Lewis acid catalyst is titanium ( IV ) isopropoxide.
Alternatively, the Knoevenagel condensation can be carried out with a Lewis acid catalyst.
The preferred Lewis acid catalyst is BF3.
A sample container, and a measured amount of dichloromethane and a Friedel-Crafts Lewis acid catalyst.
Preferably, the Lewis acid catalyst is ZnCl2 or HgBr2.
The reaction is a type of Friedel-Crafts acylation with hydrogen chloride and a Lewis acid catalyst.
The process of embodiment 13 wherein the Lewis acid catalyst is zinc chloride.
The present invention also includes a process for manufacturing the above-described immobilized Lewis Acid catalyst.
A process according to claim 1, wherein the solid Lewis acid catalyst is calcined after 450 hours.
Aryl chlorides may be prepared by the Friedel-Crafts halogenation, using chlorine and a Lewis acid catalyst.
A process as claimed in claim 6 wherein the Lewis acid catalyst is ZnCl ₂.
A method according to claim 1 or 2, wherein said Lewis acid is an aqueous Lewis acid catalyst.
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