| abstract |
The present invention relates to a method for producing an unsaturated acid and/or an unsaturated acid ester, containing a process A of reacting a compound (1) represented by the following formula (1) at a temperature of 0° C. to 350° C. in the presence of a Brønsted acid catalyst and/or a Lewis acid catalyst, to prepare a compound (2) represented by the following formula (2); n n n n n n n n n n in which each of R 1 , R 2 and R 4 independently represents a hydrogen atom, a deuterium atom or an alkyl group; each of R 3 and R 5 independently represents a hydrogen atom or a deuterium atom; R 6 represents a hydrogen atom, a deuterium atom, or an alkyl group or an aryl group; and X represents a chlorine atom, a fluorine atom, a bromine atom, or an iodine atom. |