Process for preparing compounds for tyres and tyres comprising them

The present invention relates to a compound represented by the formula ( II ) : CB - O - ROS - GC - Zn ( II ) where CB repre sents the white filler , O represents one or more oxygen bridge bonds , ROS represents an organo - silane residue , GC represents one or more coordinating groups forming a chelate with zinc in ionic form represented by linear , branched or cyclic alkyl chains , comprising one or more heteroatoms inside or at the end of the alkyl chain , and Zn represents zinc in ionic form coordinated with the coordi nating groups , a process for the preparation thereof , and the use thereof in the vulcanisation process of elastomeric compounds.