Method for producing unsaturated acid ester or unsaturated acid
View Patent ↗The present invention relates to a method for producing an unsaturated-acid ester or an unsaturated acid, containing a step of reacting a compound (1) represented by the following formula (1) with a compound represented by the following formula (2) (excluding the compound (1)) in the presence of a Lewis acid catalyst at a temperature of the boiling point of the compound (1) or higher and 350° C. or lower, thereby obtaining products including a compound represented by the following formula (3): (in formula (1) and formula (3), R 1 , R 2 and R 4 each independently may be hydrogen atom or an alkyl group, R 3 and R 5 each independently are hydrogen atom or a deuterium atom, and X is a halogen atom; in formula (2) and formula (3), R 6 may be hydrogen atom, an alkyl group or an aryl group, and R 7 is hydrogen atom or a deuterium atom).
1. A method for producing an unsaturated-acid ester or an unsaturated acid, the method comprising
reacting a compound (1) of the formula (1) with a compound (2) of the formula (2), which is different from the compound of the formula (1), in the presence of a Lewis acid catalyst at a temperature within a range from 170° C. to 350° C., thereby obtaining a reaction product comprising a compound (3) of the formula (3)
wherein R 1 , R 2 , and R 4 each independently are selected from the group consisting of a hydrogen atom, a deuterium atom, and an alkyl group which has a carbon number of from 1 to 3 and may be optionally substituted with a halogen atom and/or a deuterium atom, R 3 and R 5 each independently are selected from the group consisting of a hydrogen atom and a deuterium atom, and X is a chlorine atom, a fluorine atom, a bromine atom, or an iodine atom;
R 6 —OR 7 (2),
wherein R 6 is selected from the group consisting of a hydrogen atom, a deuterium atom, and an alkyl group which has a carbon number of from 1 to 11 and may be optionally substituted with a halogen atom and/or a deuterium atom, or an aryl group and may be optionally substituted with a halogen atom and/or a deuterium atom, and R 7 is a hydrogen atom or a deuterium atom; and
wherein R 1 , R 2 , and R 4 are the same as defined with regard to the formula (1), and R 6 is the same as defined with regard to the formula (2); wherein the Lewis acid catalyst is at least one selected from the group consisting of ZnO—ZrO 2 , ZnO—Al 2 O 3 , ZnO—TiO 2 , In 2 O 3 —ZrO 2 , NiO—ZrO 2 , CoO—ZrO 2 , MnO—ZrO 2 , silica gel, γ-alumina, ZrO 2 , ZnO—SiO 2 , Zr PbO x , Al 2 O 3 —ZrO 2 , MgO—ZrO 2 , ZnO—Cr 2 O 3 , TiO 2 , and Zr—NiOx, and wherein the Lewis acid catalyst is fixed to a support.
2. The method according to claim 1 , wherein the Lewis acid catalyst is a solid acid.
3. The method according to claim 1 , wherein the reaction is conducted in a gas phase.
4. The method according to claim 1 , wherein an amount of the compound (2) is from 0.5 to 20 mol, per 1 mol of the compound (1).
5. The method according to claim 1 , wherein an amount of the compound (2) is from 1 to 10 mol, per 1 mol of the compound (1).
6. The method according to claim 1 , wherein an amount of the Lewis acid catalyst, per 1 mol of the compound (1) present in a reaction vessel, is from 0.001 to 1 mol.
7. The method according to claim 1 , wherein an amount of the Lewis acid catalyst, per 1 mol of the compound (1) present in a reaction vessel in a batch mode or per 1 mol of the compound (1) residing in a reaction vessel in a continuous mode, is from 0.01 to 0.2 mol.
8. The method according to claim 1 , wherein the reacting temperature is from 200 to 300° C.
9. The method according to claim 1 , wherein the reaction is conducted in a liquid phase.
10. The method according to claim 1 , wherein in the reaction a compound or gas which does not chemically react with starting materials and the reaction product is used as a solvent or a diluent gas,
wherein the solvent is selected from the group consisting of pentane, hexane, heptane, petroleum ether, dimethyl ether, diethyl ether, tetrahydrofuran, 1,2-dimethyoxyethane, dichloromethane, chloroform, carbon tetrachloride, dichloroethane, acetic acid, benzoic acid, acetic anhydride, ethyl acetate, acetone, 2-butanone, acetonitrile, dimethylformamide, dimethylacetamide, dimethyl sulfoxide, benzene, toluene, chlorobenzene, dichlorobenzene, benzonitrile, nitromethane, nitrobenzene, and a mixture thereof, and
wherein the diluent gas is selected from the group consisting of nitrogen, helium, argon, and a mixture thereof.
11. The method according to claim 10 , wherein an amount of the solvent or the diluent gas is in a range that a concentration of the compound (1) is kept at 5% by mass or higher.
12. The method according to claim 1 , wherein the reaction is conducted in a continuous mode and a space velocity is from 1 to 500,000 h −1 .
13. The method according to claim 1 , wherein a reaction pressure is from 0 MPa to 10 MPa.
14. The method according to claim 1 , wherein a reaction pressure is from 0.05 MPa to 2 MPa.
15. The method according to claim 1 , wherein when the reacting is conducted in a batch mode, a reaction time is from 10 minutes to 12 hours, and when the reacting is conducted in a continuous mode, a reaction time is from 0.1 second to 60 minutes.