The synchronization of strictly different chaotic systems
which are fully linearizable
is discussed in this paper.A chaotic synchronizing controller is provided based on the sliding mode control design.To make the controller physically realizable
available synchronizing error is used to estimate system uncertainty
such as the structure difference or parameter mismatching
based on the extended states observer (ESO)
and then this controller is used to synchronizing two continuous chaotic systems.Illustrative example of the synchronization of Duffing and Van der Pol oscillators is proposed to show the effectiveness of this method.