Exploring the Reactivity of Na[W2(μ-Cl)3Cl4(THF)2]∙(THF)3 towards the Polymerization of Selected Cycloolefins

Molecules

Nikolaos Saragas²  Georgios Floros²  Grigorios Raptopoulos²  Marinos Pitsikalis¹  Patrina Paraskevopoulou²  Konstantinos Mertis² 

[1] Department of Industrial Chemistry, Faculty of Chemistry, University of Athens, Panepistimiopolis Zografou, Athens 15771, Greece;Department of Inorganic Chemistry, Faculty of Chemistry, University of Athens, Panepistimiopolis Zografou, Athens 15771, Greece;

关键词: metathesis;    ROMP;    metal-metal bonds;    tungsten;   

DOI  :  10.3390/molecules201219810

来源: mdpi

【 摘 要 】

The bimetallic compound Na[W₂(μ-Cl)₃Cl₄(THF)₂]·(THF)₃ (1, {W ³ W}⁶⁺, a′²e′⁴) is a highly efficient room-temperature initiator for ring opening metathesis polymerization (ROMP) of norbornene (NBE) and some of its derivatives. In most cases, addition of phenylacetylene (PA) as co-initiator improves the catalytic activity and retains the high cis-stereoselectivity. On the other hand, 1 can polymerize cyclopentadiene (CPD), not via a metathetic, but rather, via a cationic mechanism. Here, we present a comparison of the reactivity of the two catalytic systems (1 and 1/PA) between themselves and with other systems reported in the literature, the characterization of the polymers formed and mechanistic aspects of the corresponding reactions.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.