摘要:
A process for the production of diaryl ethers which comprises heating a compound of the formula
wherein X and Y may be selected from the group consisting of H, CN, CO₂H, CO₂R, CHO, COR, NO₂, NR3+ CF₃, provided that both X and Y may not simultaneously be H, in a solvent, in the presence of an inorganic base selected from the group consisting of the alkali metal carbonates and bicarbonates, and in the presence of a catalyst selected from the group consisting of benzoic acid, substituted benzoic acids, C2 - C14 aliphatic carboxylic acids, and alkali metal salts of said acids. A novel dinitrodiphenyl ether, a novel diaminodiphenyl ether, and polyimide resins are also disclosed.
摘要:
Dioxydiphthalic anhydride is prepared by the reaction of dihalophthalic anhydride with an alkali metal compound, such as potassium carbonate. The compound is particularly useful as a monomer in the preparation of polyimides.
摘要:
A process for the preparation of 1,1'-oxy-bis(3-trifluoromethyl-4-nitrobenzene) which comprises reacting a compound of the formula
where X is F, Cl, Br or I; with an inorganic base selected from the group consisting of alkali metal hydroxides, alkali metal carbonates, and alkali metal bicarbonates, in the presence of a catalytic quantity of a benzoate catalyst. In addition, benzoate esters of 4-nitro-3-(trifluoromethyl)phenol may be isolated.
摘要:
A process for the production of diaryl ethers which comprises heating a compound of the formula
wherein X and Y may be selected from the group consisting of H, CN, CO₂H, CO₂R, CHO, COR, NO₂, NR3+ CF₃, provided that both X and Y may not simultaneously be H, in a solvent, in the presence of an inorganic base selected from the group consisting of the alkali metal carbonates and bicarbonates, and in the presence of a catalyst selected from the group consisting of benzoic acid, substituted benzoic acids, C2 - C14 aliphatic carboxylic acids, and alkali metal salts of said acids. A novel dinitrodiphenyl ether, a novel diaminodiphenyl ether, and polyimide resins are also disclosed.
摘要:
A method for the preparation of acyloxyphthalic anhydride or oxydiphthalic anhydride which comprises the reaction of a halophthalic anhydride with an alkali metal salt and at least a catalytically effective amount of an acid or acid derivative selected from the group consisting of benzoic acids, substituted benzoic acids, benzoic acid salts or substituted benzoic acid salts, and hydrolyzable benzoyl esters, and hydrolyzable substituted benzoyl esters, alkyl carboxylic acids, hydrolyzable esters of alkyl carboxylic acids, and salts of alkyl carboxylic acids. The process may be conducted without solvent, in a polar solvent or in a non-polar solvent using a phase transfer catalyst.
摘要:
A process for the selective hydrodefluorination of a tetrafluorophthalimide compound of the formula where X is 1 and R is a monovalent organo group; or X is 2 and R is a divalent organo group; comprises reacting (I) the tetrafluorophthalimide with zinc in an aqueous alkali metal hydroxide medium. The product may be hydrolyzed to form 3,4,6-trifluorophthalic acid.
摘要:
A process for the preparation of 1,1'-oxy-bis(3-trifluoromethyl-4-nitrobenzene) which comprises reacting a compound of the formula
where X is F, Cl, Br or I; with an inorganic base selected from the group consisting of alkali metal hydroxides, alkali metal carbonates, and alkali metal bicarbonates, in the presence of a catalytic quantity of a benzoate catalyst. In addition, benzoate esters of 4-nitro-3-(trifluoromethyl)phenol may be isolated.
摘要:
Disclosed is a method of making 1,1′-sulfonyl-bis(3-nitro-5-trifluoromethyl) benzene by reacting dibenzotrifluoride sulfide with at least four equivalents of fuming nitric acid and at least four equivalents of fuming sulfuric acid at a temperature below 20°C, until the sulfide link is oxidized to a sulfone link, then raising the temperature to above 20°C until the reaction is complete. Also disclosed is the preparation of 3,3′-sulfonyl-bis(5-trifluoromethyl) benzamine by reducing the benzene compound.