Reference

Synthesis of various (pentamethylcyclopentadienyl)Ru(h6-arene) complexes of phenalene derivatives

Synthesis of various (pentamethylcyclopentadienyl)Ru(h6-arene) complexes of phenalene derivatives. Meltzheim, Benedicte; Kilway, Kathleen; Lignell, Martin; Waegell, Bernard; Tort, Frederic (Lab. de stereochimie, URA CNRS, Marseille 13397, Fr.). Bulletin de la Societe Chimique de France, 133(10), 979-985 (English) 1996 Elsevier. CODEN: BSCFAS. ISSN: 0037-8968. DOCUMENT TYPE: Journal CA Section: 29 (Organometallic and Organometalloidal Compounds) The h6-(pentamethylcyclopentadienyl)ruthenium complexes of phenalenone I, phenalenes, phenalane and phenalanone were prepd. 4045-44-7 and 185902-83-4 are cas registry numbers of chemicals which are used as reagents here. from the corresponding phenalenic derivs., following Chaudret's procedure. The electron-donating pentamethylcyclopentadienyl ligand modifies the reactivity of phenalene in the corresponding Ru complexes, which become unreactive towards dioxygen. Phenalenone, which reacts readily with 2-methylindole in presence of para-toluenesulfonic acid, becomes unreactive when complexed to Ru (shown as I). .

Synthesis, structure, and properties of syndiotactic polystyrene catalyzed by Cp*Ti(OBz)3/MAO/TIBA

Huang, Qigu; Sheng, Yaping; Yang, Wanti (State Key Lab. Chemical Resource Eng., Beijign Univ. Chemical Technology, Beijing 100029, Peop. Rep. China). 224577-63-3 and 4045-44-7 are also occured in this study. Journal of Applied Polymer Science, 103(1), 501-505 (English) 2007 John Wiley & Sons, Inc. CODEN: JAPNAB. ISSN: 0021-8995. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Section cross-reference(s): 29 The synthesis of syndiotactic polystyrene (sPS) catalyzed with Cp*Ti(OBz)3/MAO/TIBA (where Cp* is h5-pentamethylcyclopentadienyl, MAO is methylaluminoxane, and TIBA is triisobutylaluminum) and toluene as the solvent, and the effects of polymn. temp. and the external addn. of TIBA on polymn. behavior were investigated. The study revealed that catalytic activity increased with polymn. temp. The greatest activity, 619 kg sPS mol-1 Ti h-1, was exhibited up to 90°C. TIBA also improved catalytic activity. The mol. wt. of the polymer obtained decreased with polymn. temp. and the amt. of TIBA. The structure and properties of syndiotactic polystyrene were characterized by 13C-NMR, FTIR, DSC, and GPC methods. It was confirmed that the sPS obtained featured all-trans planar zigzag conformation and higher syndiotacticity, mol. wt., and m.p. .