Repsol Quimica, S.a.

Maria Dolores Parellada Ferrer

Juan Antonio Barrio Calle

Luis Mendez Llatas

Pascual Royo Gracia

Jos&eacute; Sancho Royo

Juan C Serrano

Agreda Tomas C

Procedure for the preparation of aromatic derivatives of titanocene

Procedure of olefin hydrogenation in liquid phase in the presence of homogeneous catalysts that contain, as essential component, a titanocene of general formula Cp CpTiR.sub.2, Cp CpTiR.sub.2, Cp Cp[CpTiR.sub.2 ].sub.2, or Cp Cp[Cp TiR.sub.2 ].sub.2 where Cp is a pentamethylcyclopentadienyl, Cp cyclopentadienyl, Cp Cp are two cyclopentadienyl rings linked together by a dimethylsililene (Me.sub.2 Si), and R is an alyl, aryl, alkylaryl, or alcoxide group containing between 1 and 20 carbon atoms or a halogen atom, a PPh.sub.2, CH.sub.2 SiMe.sub.3, CH.sub.2 PPh.sub.2, or H. These catalysts are very active in the hydrogenation of linear and branched, internal and external olefins, cycloolefins and diolefins. In addition, they are able to selectively hydrogenate double bonds of diene groups in conjugated diene polymers and copolymers, of medium molecular weight between approximately 500 and 1,000,000 and, in particular the random copolymers and styrene and butadiene or isoprene block copolymers, containing the latter at least one styrene block and a polybutadiene and/or isoprene block.

Olefin hydrogenation procedure

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Madrid, Spain

Maria Dolores Parellada Ferrer