abstract |
Solid adducts comprising a MgCl 2 , ethanol and a compound (A), said compounds being present in molar ratios defined by the following formula MgCl 2 .(EtOH) n (A) p in which n is from 0.1 to 6, p ranges from 0.001 to 0.5 and A is a compound selected from cyclic hydrocarbon structures which are substituted with at least two hydroxy groups. |