Abstract
AbstractButadiene has been polymerized by π‐allyl‐Ni‐halides (I) to low molecular weight stereoregular polymers, with either benzene, n‐pentane, tetrahydrofuran, cyclohexanol, or ethyl alcohol used as solvents. Solid polymers and oily products were simultaneously obtained as polymerization products. In benzene as solvent, π‐allyl‐Ni‐I and π‐allyl‐Ni‐Br gave predominantly trans‐1,4 polymers, while π‐allyl‐Ni‐Cl gave polymers largely composed of cis‐1,4 units. In the other solvents predominantly trans‐1,4 polymers were obtained, irrespective of the nickel derivative used. By reacting π‐allyl‐Ni‐Br, in benzene solution, with either AlBr3, Al2(O‐i‐C3H7)3Br3, BF3 or TiCl2 (O‐i‐C3H7)2, complexes were obtained (II) which polymerize butadiene to predominantly cis‐1,4 polymers. Evidence is reported that these complexes are of ionic type and contain the cationmagnified imageThe different stereospecificity observed in the polymerizations by I and II is interpreted on the basis of the different mode of coordination of butadiene to Ni of the complexes I and II, respectively.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Polymer Science Part C: Polymer Symposia
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
