The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: Dichloro(1,5-cyclooctadiene)platinum(II)( cas:12080-32-9 ) is researched.Name: Dichloro(1,5-cyclooctadiene)platinum(II).Liu, Sumeng; Zhang, Zhejun; Abelson, John R.; Girolami, Gregory S. published the article 《Platinum ω-Alkenyl Compounds as Chemical Vapor Deposition Precursors. Mechanistic Studies of the Thermolysis of Pt[CH2CMe2CH2CH=CH2]2 in Solution and the Origin of Rapid Nucleation》 about this compound( cas:12080-32-9 ) in Organometallics. Keywords: platinum alkenyl compound deuterated preparation decomposition elimination kinetics. Let’s learn more about this compound (cas:12080-32-9).
Cis-bis(η1,η2-2,2-dimethylpent-4-en-1-yl)platinum, Pt[CH2CMe2CH2CH=CH2]2 (3), is a recently discovered CVD precursor for the deposition of highly smooth Pt thin films without nucleation delays on a variety of substrates. This paper describes detailed mechanistic studies of the pathway by which 3 reacts upon being heated in solution In various solvents between 90 and 130°, 3 decomposes to generate ~1 equiv of 4,4-dimethylpentenes by addition of a H atom to the pentenyl ligands in 3. The extra H atoms arise by dehydrogenation of other pentenyl ligands; some of these dehydrogenated ligands are released as Me-substituted methylenecyclobutanes and cyclobutenes. A combination of isotope labeling and kinetic studies suggests that 3 decomposes by C-H activation of both allylic and olefinic C-H bonds to give transient Pt hydride intermediates, followed by reductive elimination steps to form the pentene products, but that the exact mechanism is solvent-dependent. In C6F6, solvent association occurs before C-H bond activation, and the rate-determining step for thermolysis is most likely the formation of a Pt σ complex. In hydrocarbon solvents, the solvent is little involved before C-H bond activation, and the rate-determining step is most likely the formation of a Pt σ complex only for γ-C-H and ε-C-H bond activation, but cleavage or formation of a C-H bond for δ-C-H bond activation. A comparison of the thermolysis reactions under CVD conditions and in solution suggests that the high smoothness of the CVD-grown films is due in part to rapid nucleation (which is a consequence of the availability of low-barrier C=C bond dissociation pathways) and in part to the formation of C-containing species that passivate the Pt surface.
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