A process for producing chromenes intended for the preparation of thermosetting resins, comprising the step of converting an aromatic propargyl ether of general formula below: wherein: R 1 and R 5 represent, independently of one another, a hydrogen atom, or a C 2 -C 6 alkene, C 2 -C 6 alkyne, O-(C 1 -C 6)alkyl, O-(C 2 -C 6)alkene or O-(C 2 -C 6)alkyne group, on condition that at least one of R 1 and R 5 represents a hydrogen atom; R 2 and R 4 represent, independently of one another, a hydrogen atom, a C 2 -C 6 alkene group, a C 2 -C 6 alkyne group such as a propargyl, an O-(C 1 -C 6)alkyl group, an O-(C 2 -C 6)alkene group or an O-(C 2 -C 6)alkyne group, such as an O-propargyl; and R 3 represents a hydrogen atom, an O-(C 1 -C 6)alkyl group or a C 2 -C 6 alkene group, the alkene group being optionally substituted with a group of general formula below: wherein: R 6 and R 9 represent, independently of one another, a hydrogen atom, or a C 2 -C 6 alkene, C 2 -C 6 alkyne, O-(C 1 -C 6)alkyl, O-(C 2 -C 6)alkene or O-(C 2 -C 6)alkyne group, on condition that at least one of R 6 and R 9 represents a hydrogen atom; and R 7 and R 8 represent, independently of one another, a hydrogen atom, a C 2 -C 6 alkene group, a C 2 -C 6 alkyne group such as a propargyl, an O-(C 1 -C 6)alkyl group, an O-(C 2 -C 6)alkene group or an O-(C 2 -C 6)alkyne group such as an O-propargyl; on condition that at least one of R 1, R 2, R 3, R 4 and R 5 does not represent a hydrogen atom or an O-(C 1 -C 6)alkyl group; and the cis/trans isomers thereof and the optical isomers thereof, and racemic mixtures thereof into a chromene by homogeneous catalysis with copper salts in anisole at a temperature of between 100 and 170°C, advantageously between 120 and 160°C. R 1 and R 5 represent, independently of one another, a hydrogen atom, or a C 2 -C 6 alkene, C 2 -C 6 alkyne, O-(C 1 -C 6)alkyl, O-(C 2 -C 6)alkene or O-(C 2 -C 6)alkyne group, on condition that at least one of R 1 and R 5 represents a hydrogen atom; R 2 and R 4 represent, independently of one another, a hydrogen atom, a C 2 -C 6 alkene group, a C 2 -C 6 alkyne group such as a propargyl, an O-(C 1 -C 6)alkyl group, an O-(C 2 -C 6)alkene group or an O-(C 2 -C 6)alkyne group, such as an O-propargyl; and R 3 represents a hydrogen atom, an O-(C 1 -C 6)alkyl group or a C 2 -C 6 alkene group, the alkene group being optionally substituted with a group of general formula below: R 6 and R 9 represent, independently of one another, a hydrogen atom, or a C 2 -C 6 alkene, C 2 -C 6 alkyne, O-(C 1 -C 6)alkyl, O-(C 2 -C 6)alkene or O-(C 2 -C 6)alkyne group, on condition that at least one of R 6 and R 9 represents a hydrogen atom; and R 7 and R 8 represent, independently of one another, a hydrogen atom, a C 2 -C 6 alkene group, a C 2 -C 6 alkyne group such as a propargyl, an O-(C 1 -C 6)alkyl group, an O-(C 2 -C 6)alkene group or an O-(C 2 -C 6)alkyne group such as an O-propargyl; on condition that at least one of R 1, R 2, R 3, R 4 and R 5 does not represent a hydrogen atom or an O-(C 1 -C 6)alkyl group; and the cis/trans isomers thereof and the optical isomers thereof, and racemic mixtures thereof into a chromene by homogeneous catalysis with copper salts in anisole at a temperature of between 100 and 170°C, advantageously between 120 and 160°C.