A compound of formula: wherein: - R3 and R4 are independently a hydrogen atom, a C1-C6 alkyl group or a C2-C6 alkenyl group, - R5 is a methyl, ethyl, i-butyl, t-butyl, n-pentyl, a C2-C6 alkenyl group or a (CH2) 02-acryl group, - R6 is a C1-C6 alkyl group, a C2-C6 alkenyl group, a 0-2-aryl (CH2) group or a group C5-C6 cycloalkenyl cycloalkyl, and - R7 is a hydrogen atom, a C1-C6 alkyl group or a C2-C6 alkenyl group； or - R3, R4 and R5 are as defined above, and - R6 and R7 together with the carbon atoms to which they are attached form a C5-C6 cycloalkyl or cycloalkenyl group； with the proviso that said compound is not: - 2,2-dimethyl-4-ethylhexahydrobenzo [1,3] dioxin - 2,2-dimethyl-4-n-pentylhexahydrobenzo [1,3] dioxin - 2,2-dimethyl -4-phenylhexahydrobenzo [1,3] dioxin - 2,4-dimethylhexahydrobenzo [1,3] dioxin - 2,4-diphenylhexahydrobenzo [1,3] dioxin - 4-ethyl-2-methylhexahydrobenzo [1,3] dioxin - 4 -methyl-2-phenylhexahydrobenzo [1,3] dioxin - 2,2,4-trimethylhexahydrobenzo [1,3] dioxin.Un compuesto de fórmula: en la que: - R3 y R4 son independientemente un átomo de hidrógeno, un grupo alquilo C1-C6 o un grupo alquenilo C2-C6, - R5 es un metilo, etilo, i-butilo, t-butilo, n-pentilo, un grupo alquenilo C2-C6 o un grupo (CH2)02-acrilo, - R6 es un grupo alquilo C1-C6, un grupo alquenilo C2-C6, un grupo (CH2)0-2-arilo o un grupo cicloalquilo ocicloalquenilo C5-C6, y - R7 es un átomo de hidrógeno, un grupo alquilo C1-C6 o un grupo alquenilo C2-C6；o - R3, R4 y R5 son como se define anteriormente, y - R6 y R7 junto con el átomo de carbono al que están unidos forman un grupo cicloalquilo o cicloalquenilo C5-C6； con la condición de que dicho compuesto no sea: - 2,2-dimetil-4-etilhexahidrobenzo[1,3]dioxina - 2,2-dimetil-4-n-pentilhexahidrobenzo[1,3]dioxina - 2,2-dimetil-4-fenilhexahidrobenzo[1,3]dioxina - 2,4-dimetilhexahidrobenzo[1,3]dioxina - 2,4-difenilhexahidrobenzo[1,3]dioxina - 4-etil-2-metilhexahidrobenzo[1,3]dioxina - 4-metil-2-fenilhexahidrobenzo[1,3]dioxina - 2,2,4
