Reaction, coupled order-disorder

The groups of Kramer and Hawker provided an example where the target polymer could be made using sequential CFR polymerizations, but CuAAC simplified the process and made it possible to obtain the polymer with a precise molecular weight and a low polydispersity index (PDl). Attempts to make poly(benzyl methacrylate)-b-poly(butyl acrylate) with equal volume fractions of each block to be used for the determination of order-disorder transition (ODT) led to materials with imprecise volume fractions and PDls higher than 1.3. Instead, by using preformed homopolymers that were then coupled by CuAAC, the authors were able to make a small library of covalent diblock copolymers with low PDIs, while also performing fewer total reactions. 

The unsymmetrical silyl-hydrido zirconium dimer, Cp2Zr(SiPhMeH) (p-H)2(SiPhMe2) ZrCp2, similar to the above-mentioned complex 6, was isolated from the dehydrogenative coupling reaction of phenylmethylsilane with dimethylzirconocene. The X-ray analysis of the dimer shows a disorder which is produced by the ordered superposition of two... 

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