Factors of influence in the activity of titanocenes in the homogeneous catalysis of polymerization of polystyrene.

It is presented a review with 42 references dealing with the historical aspects of organometallics of titanium, the application of titanocenes in catalytical systems and the factors that may influence in the polymerisation of alpha -olefinas with the consequent repercussions an the structures of the polymers.UNESP, Inst Quim Araraquara, Dept Quim Geral & Inorgan, BR-14800900 Araraquara, SP, BrazilUNESP, Inst Quim Araraquara, Dept Quim Geral & Inorgan, BR-14800900 Araraquara, SP, Brazi

Artificial Intelligence in Prostate Cancer Diagnosis on Magnetic Resonance Imaging: Time for a New PARADIGM.

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Pressupost anual 2013 Pla d'actuació de la Fundació BCD

Aprovat per la Comissió Executiva de la Fundació de 03-06-201

Styrene stereospecific catalysis by alkyl substituted titanocenes of the type (RCp)(2)TiCl2

A series of seven alkyl substituted complexes of the type (RCp)(2) TiCl2 (R =H, ethyl, n-propyl, iso-propyl, n=butyl, iso-amyl, ciclo-hexyl) was prepared, as well as the novel compound with R = sec-butyl, and the effects of the substituent on the polymerisation of styrene was investigated at the temperatures of 0 and 50 degreesC. It was found that R = n=butyl maximises the production of syndiotactic polystyrene. Alkyl ligands with R = RCH2- are superior to those with R = RR'CH- and to the precursor Cp2TiCl2 in the production of high molecular weight syndiotactic polystyrene.UNESP, Inst Quim Araraquara, Dept Quim Geral & Inorgan, BR-14800900 Araraquara, SP, BrazilUFRJ, IMA, Inst Macromol Profa Eloisa Mano, BR-21945970 Rio De Janeiro, BrazilUNESP, Inst Quim Araraquara, Dept Quim Geral & Inorgan, BR-14800900 Araraquara, SP, Brazi