Examples of 'phosphonium salt' in a sentence
Meaning of "phosphonium salt"
phosphonium salt - Phosphonium salt is a type of salt that contains a phosphorus atom and is used in various chemical reactions and organic synthesis processes
How to use "phosphonium salt" in a sentence
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phosphonium salt
Phosphines may also be added as a phosphonium salt.
A specific example of such a phosphonium salt may be tetrabutylphosphonium chloride.
Said ylide are generally prepared by treatment of a phosphonium salt with a base.
The counterion for the phosphonium salt is preferably a halogen ion.
In one aspect the phase transfer catalysts can be a quaternary ammonium or phosphonium salt.
The organic phosphonium salt is then recovered from the aqueous portion.
A presently preferred catalyst is a phosphonium salt catalyst.
Conversion to the phosphonium salt and ring closure provides the desired indoles.
This invention relates to deactivation of phosphonium salt catalysts.
The above obtained phosphonium salt can be converted to a methyl derivative by treating with a base.
Especially the preferred counter anion in a quaternary phosphonium salt is bromide or chloride.
The phosphonium salt preferably used is tri-tert-butylphosphonium tetrafluoroborate.
The crosslinking accelerator is a quaternary phosphonium salt free from a chlorine atom.
Suitable phase transfer catalysts include a quaternary ammonium salt, preferably tetrabutylammonium bromide, or a phosphonium salt.
The quaternary ammonium salt or phosphonium salt allows the catalyst to dissolve in the myrcene.
See also
These polymeric binders are partially soluble in seawater due to the small phosphonium salt groups.
The use as a biocide of a phosphonium salt of the formula,.
Composition according to claim 1 wherein the hydroxyalkylphosphine compound is a water soluble tetrakis ( hydroxymethyl ) phosphonium salt.
One of the hydrolysable polymeric binders described comprises phosphonium salt groups bound to a polymeric backbone.
The phosphonium salt ( compound h ) is used without further work up.
Catalyst deactivation increased with the increasing quantity of phosphonium salt with respect to rhodium.
By contrast, certain hydrocarbyl phosphonium salt advancement catalysts are very stable to hydroxyl ion attack.
Their use is particularly preferred when employing highly activating uronium or phosphonium salt coupling reagents.
The process of claim 5, wherein the phosphonium salt is tri-tert-butylphosphonium tetrafluoroborate.
According to the invention, preference is given to the use of a phosphonium salt as catalyst.
Treatment with triphenylphosphine gives phosphonium salt 21-9, which is converted to the ylide with potassium hexamethyldisilazide.
In the first step, a phosphorus ylide is prepared by treating a suitable phosphonium salt with a base.
In these additives, the quaternary phosphonium salt is replaced by an ammonium salt.
Et2O was added to precipitate out the desired phosphonium salt.
Preferred C15-triphenyl phosphonium salt of formula II is the chloride salt.
Heating in dichloroethane with triphenylphosphine converts MM2 to the phosphonium salt MM3.
If necessary, a fresh organic phosphonium salt is supplemented.
Examples include tetraalkylammonium hydroxide ( e.g. tetraethylammonium hydroxide ) or a quaternary phosphonium salt.
A process comprising reacting vitamin A phosphonium salt with hydrogen peroxide.
The use according to claim 1 of a water-soluble tetrakis ( hydroxymethyl ) phosphonium salt.
The digital video disk substrate of 5, wherein the quaternary phosphonium salt is tetraphenylphosphonium tetraphenylborate.
A production method of defined by claim 15, wherein the phase transfer catalyst is a tetraalkyl phosphonium salt.
Process according to Claim 1, characterized in that the said phosphonium salt is a halide, preferably a bromide.
The phosphonium salt derived from Y-bromo-B-crotonitrile H.
A process comprising synthesizing from vitamin A phosphonium salt and vitamin A aldehyde.
Displacement of the allylic chloride in intermediate ( 1 ) with triphenylphosphine gives the phosphonium salt ( 2 ).
The use of a water soluble tetrakis ( hydroxymethyl ) phosphonium salt as a mass killer.
In certain embodiments, the co-catalyst is a phosphonium salt.
Thus, a compound d is allowed to react with a phosphonium salt of the formula,.
Heating with triphenylphosphine in toluene provides the phosphonium salt 22-4.
After 72h a yellow gummy solid of the phosphonium salt precipitated.
In certain embodiments, the co-catalyst is an ammonium salt, a phosphonium salt or an arsonium salt.
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