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Finished Coordination Chemistry II (CCC II) is the sequel to what has develop into a vintage within the box, complete Coordination Chemistry, released in 1987. CCC II builds at the first and surveys new advancements authoritatively in over 2 hundred newly comissioned chapters, with an emphasis on present developments in biology, fabrics technology and different parts of up to date medical curiosity.
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Additional resources for Comprehensive Coordination Chemistry II. Applications of coordination chemistry
784 However, polymerizations initiated with (250) are much more 40 Metal Complexes as Catalysts for Polymerization Reactions dramatically accelerated by the addition of a bulky Lewis acid, such as (251). 3 h at 50 C (cf. 53% after 320 h in the absence of (251)). The rate enhancement is due to activation of the lactone towards nucleophilic attack by binding to the Lewis acidic center of (251). 776 In the latter case the propagating species is an aluminum enolate and this too may initiate the ROP of lactones, such as -VL, albeit slowly.
444 In addition, it is believed to react with Ni(acac)2 to afford a Ni–methyl species which then inserts MMA. The resultant enolate is then transferred onto the aluminum center to give the initiating species. 11, and Mn increases linearly both with Me Me O N N tBu O N Ni(acac)2, MMA Al (ArO)2AlMe, (185) tBu tBu tBu O tBu (186) Ar' Ar N N Ar O Mg Ar Ar' N Al tBu O OMe N Mg N O Ar Ar = 2,6-iPr2C6H3 Ar' = 2,4,6-Me3C6H2, (187) tBu O tBu 26 Metal Complexes as Catalysts for Polymerization Reactions conversion and with the [M]0/[I]0 ratio.
I Bu3Al. It has since been shown that if less coordinating anions are used, then cationic zirconocene alkyls may serve as highly active single-component catalysts. 487 Syndio-rich PMMA results with an rr content in the range 63–70% depending upon the solvent used. 485,487,490–492 Me Me Cp2Zr Cp2Zr OMe OMe O O OMe Me (MMA)n Me slow O Me OMe (MMA)n Me Me O ZrCp2 Me ZrCp2 MMA Me OMe Me Cp2Zr OMe O + (MMA)n+1 O Me Me ZrCp2 Scheme 7 Zr Me O Me O Me Zr THF Me Me Zr Me Me Me Me Zr BPh4 (199) (200) (201) (202) OtBu Zr Si N tBu O O Zr tBuO (203) Me THF Cy Si Ti NtBu THF O N Cy BPh4 (204) Ta N Me (205) (206) Attempts to prepare highly syndiotactic PMMA using zirconocene catalysts have met with little success, despite the initial observation of rac dyad selectivity with Cp2ZrMe2.
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