INDEX palladium salts

Polymeric alkene ozonides are shock-sensitive that of trans -2-butene exploded when exposed to friction in a ground glass joint. The use of GLC to analyse crude ozonisation products is questionable because of the heat-sensitivity of some constituents [4], Ozonides are decomposed, sometimes explosively, by finely divided palladium, platinum or silver, or by iron(II) salts [5]. Individually indexed compounds are ... 

Brookhart and coworkers investigated the copolymerization of MA and ethene with 2,6-di-tso-propyl-substituted a-diimine palladium catalysts 3 (Figure 4, Section 3.24.4). Upon activation of (N N)PdMeCl precursors with sodirrm salts of noncoordinating counter ions in presence of acrylates formation of an insertion product is observed. This stmcture is exceptionally stable and can act as a preformed active catalytic species (SCC Section 3.24.4.3.2). Additionally, copolymerization of ethene with acrylates is possible as well. It could be shown by simultaneous refractive index and UV detection GPC that acrylate is uniformly incorporated in the copolymer. and NMR spectroscopies showed that the polymer is a highly branched copolymer, similar to the ethene homopolymers accessible with the same catalyst rmder similar conditions. The acrylate units are incorporated predominantly on the end of the branches. Only a small part of the resrdting ester units, proportional to the ethene pressme, is incorporated directly in the polymer backbone (Scheme 24). 

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