Using metoxialcoxifenilalquilo substituted derivatives as preservative, preservation method, compound and composition

Use as a preservative of at least one compound of formula (I), alone or as a mixture: ** ** Formula wherein: - X represents> = O or -OH; - R1 represents a hydrogen atom or a methyl; - R2 represents a hydrogen atom, a methyl or an ethyl; - R3 represents a hydrocarbon based linear saturated C1-C4 radical.