Catalyst component for the polymerization of olefins comprising Mg, Ti and an electron donor compound of the following formula (I) in which R2-R8 groups, equal or different to each other, are selected from hydrogen, halogen and C1-C15 hydrocarbon groups, optionally containing an heteroatom selected from halogen, O, P, S, N, and Si and R9 groups are selected from C1-C15 hydrocarbon groups optionally containing an heteroatom selected from halogen, O, P, S, N, and Si.