Tetrahydrofuran, the abbreviation of THF, is a heterocyclic organic compound. It belongs to ethers and is the fully hydrogenated product of the aromatic compound furan. It can be used as an aprotic solvent with moderate polarity in chemical reaction and solvent extraction. Tetrahydrofuran is a ...
which is not conducive to large-scale production and has been gradually eliminated. (2) Maleic anhydride catalytic hydrogenation method Maleic anhydride and hydrogen enter the reactor containing nickel catalyst from the bottom, and the ratio of tetrahydrofuran to γ-butyrolactone in the product can be...
The same product is formed if treated with sodium and fluorenone in THF. Complex 302 occurs among the products of interaction of [(η5-Cp*)Ir(NBut)] with aromatic pinacols. Sign in to download full-size image [(η5-Cp*)Ni(acac)] with 2,2′-dilithiobiphenyl in ether gives the ...
In the parent patent polybutylene glycol dicarboxylic acid ester of formula RCOO-(CH2CH2CH2CH3)-n COR1 (I) (where R and R1 are alkyl, carboxy contg. opt. ethylenicall unsatd. aliphatic gp. or a carboxy contg. aromatic gp. and n is 2-200) is prepd. by polymerising THF in the ...
As a Lewis acid, BF3 can interact with a Lewis base, such as thio- phene, benzene, fused ring compound, etc.37,38 This interaction can decrease the resonance energy of these aromatic compound, thus leading the lose of an elec- tron from these compounds much easier and making high ...
Ethanol or, preferably, methanol is advantageously used as the alkanols of 1 to 4 carbon atoms. Suitable hydrocarbons of 3 to 18, preferably 4 to 12, carbon atoms are aromatic, saturated or unsaturated aliphatic or cycloaliphatic hydrocarbons, which may also be used in the form of a mixture....
“Alkyloxy (alkoxy)” refers to a CnH2n+1O— group, in which alkyl is defined in this section. The preferred alkyloxy groups are methyloxy, ethyloxy, n-propyloxy, iso-propyloxy and n-butoxy. “Aryl” refers to an aromatic mono- or polycyclic system comprising 6-14 carbon atoms, predom...
PTHF itself is formed only by subsequent saponification or transesterification. This preparation is therefore referred to as a two-stage PTHF process. Other telogens act not only as chain termination reagents, but are also incorporated into the growing polymer chain of PTHF. They not only have ...
A polyurethane-urea elastomer is prepared by reacting a copolymer of propylene oxide and tetrahydrofuran having hydroxyl end groups with an organic polyisocyanate and the isocyanate-terminated polymer is then reacted with an aromatic diamine in either bulk or solution process. Inventors...
care has to be taken to ensure that it does not react with the starting material, for example the MA which is preferably used. Useful solvents include: tricresyl phosphate, dibutyl maleate, high molecular weight waxes, aromatic hydrocarbons having a molecular weight of from 150 to 400 and a ...