Examples of 'dihydroxy compound' in a sentence
Meaning of "dihydroxy compound"
Dihydroxy compound: A compound containing two hydroxyl groups (-OH), often found in organic chemistry and biochemistry
How to use "dihydroxy compound" in a sentence
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dihydroxy compound
There are no particular restrictions on the aromatic dihydroxy compound.
This dihydroxy compound need not be liquid when used.
It is also preferred that the dihydroxy compound is ethylene glycol.
Too high temperatures result in thermal deterioration of the dihydroxy compound.
The aliphatic dihydroxy compound includes various kinds of compounds.
The proportions of fluorophthalic anhydride and dihydroxy compound may vary considerably.
Method for storing dihydroxy compound to be used as starting material for polycarbonate.
A polycarbonate can be obtained by the polycondensation of a carbonate diester and an aromatic dihydroxy compound.
The dihydroxy compound also can be reacted with the appropriate sulfonic anhydride.
The polyester resin is a polyester formed from dihydroxy compound units and dicarboxylic acid units.
Metallic catalysts are used to promote a polymerization reaction between diacid material and the dihydroxy compound.
The aromatic dihydroxy compound according to an embodiment of the present invention may be a bisphenol A.
The melt polymerization process involves the transesterification of an aromatic dihydroxy compound and a diester carbonate.
Especially, dihydroxy compound and carbonic acid diester are preferable.
In some embodiments, the lyophilized powder also comprises free dihydroxy compound.
See also
The aforementioned aromatic dihydroxy compound may also be a combination of 2 or more substances.
From the standpoint of quantitativeness, it is preferred to mix the dihydroxy compound as a melt.
In a specific embodiment the dihydroxy compound corresponding to formulas ( 4a ) can be used.
In some preferred embodiments, the composition also comprises the free dihydroxy compound.
Step 4c involves the oxidative cleavage of dihydroxy compound XXII to obtain the aldehyde XXIII.
The additives may be added either simultaneously with, or separately from, the aromatic dihydroxy compound.
It is preferred that use should be made of a dihydroxy compound containing 2-9 carbon atoms.
In the carbonate blocks, each R2 is independently an organic radical derived from a dihydroxy compound.
The aromatic dihydroxy compound used herein is preferably a compound represented by the following formula ( 4 ).
It is easy to purify monomers, such as an aromatic dihydroxy compound and a carbonic diester.
The solid-state dihydroxy compound is crushed according to need and fed to the receiving hopper ( 1 ).
It is preferred that the hydroxy starting material be the dihydroxy compound ( I ).
Use of this dihydroxy compound ( II ) is also preferred.
Among these compounds, bisphenol A which is an aromatic dihydroxy compound is preferably used.
The solid dihydroxy compound according to the invention preferably is solid at 25°C.
The method according to claim 43 wherein the at least one organic dihydroxy compound is bisphenol A.
As the aliphatic dihydroxy compound which is one of the component ( A ), various compounds are usable.
Compound 1 is reduced with borohydride to produce the dihydroxy compound 2.
Oxidation of this dihydroxy compound using PDC in CH2Cl2 may provide the diketone 38.
The following are specific examples of this aromatic dihydroxy compound [ IVa ],.
The dihydroxy compound of claim 8, characterized in that R5 and R6 are both hydrogen.
A process according to claim 1, characterised by using, per mole of the aromatic dihydroxy compound.
In certain particularly preferred embodiments, the dihydroxy compound is mannitol, most preferably D-mannitol.
Compounds having formula [ II ] [ sic ] below can be used as the aromatic dihydroxy compound.
For purposes of the present invention, the dihydroxy compound is D-mannitol.
The fraction of chain terminators is generally from 1 to 20 mol %, per mole of dihydroxy compound.
A process according to claim 1, wherein the hydroxy compound is the dihydroxy compound of formula ( I ).
In one embodiment, a polyethylene glycol ( " PEG " ) may be utilized as the dihydroxy compound.
The total amount of the dicarboxylic acid and the dihydroxy compound was 100 mole %.
The term " cyclizing agent " refers to a base that cyclizes the dihydroxy compound ( I ) to glycidol ( IV ).
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