Topic
Acyclic diene metathesis
About: Acyclic diene metathesis is a research topic. Over the lifetime, 1903 publications have been published within this topic receiving 81665 citations.
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TL;DR: The Grignard metathesis (GRIM) polymerization of 3-alkylthiophenes proceeds by a quasi-living chain growth mechanism, not by a step growth process as mentioned in this paper.
Abstract: The Grignard metathesis (GRIM) polymerization of 3-alkylthiophenes proceeds by a quasi-“living” chain growth mechanism, not by a step growth process. Kinetic studies of the Grignard metathesis polymerization of 2,5-dibromo-3-alkylthiophenes showed that the molecular weight of poly(3-alkylthiophenes) is a function of the molar ratio of the monomer to nickel initiator, and conducting polymers with predetermined molecular weights and relatively narrow molecular weight distributions (PDIs = 1.2−1.5) can be made. Sequential monomer addition resulted in new block copolymers containing different poly(3-alkylthiophene) segments.
602 citations
TL;DR: 1,4-Benzoquinones have been found to prevent olefin isomerization of a number of allylic ethers and long-chain aliphatic alkenes during ruthenium-catalyzed Olefin metathesis reactions, and this mild, inexpensive, and effective method increases the synthetic utility of olefins via improvement of overall product yield and purity.
Abstract: 1,4-Benzoquinones have been found to prevent olefin isomerization of a number of allylic ethers and long-chain aliphatic alkenes during ruthenium-catalyzed olefin metathesis reactions. Electron-deficient benzoquinones are the most effective additives for the prevention of olefin migration. This mild, inexpensive, and effective method to block olefin isomerization increases the synthetic utility of olefin metathesis via improvement of overall product yield and purity.
558 citations
519 citations
TL;DR: One example that achieves selectivity with respect to the distribution of product molecular weights is reported, in which n-decane is the predominant high-molecular-weight product of the metathesis of two moles of n-hexane.
Abstract: With petroleum supplies dwindling, there is increasing interest in selective methods for transforming other carbon feedstocks into hydrocarbons suitable for transportation fuel. We report the development of highly productive, well-defined, tandem catalytic systems for the metathesis of n-alkanes. Each system comprises one molecular catalyst (a "pincer"-ligated iridium complex) that effects alkane dehydrogenation and olefin hydrogenation, plus a second catalyst (molecular or solid-phase) for olefin metathesis. The systems all show complete selectivity for linear (n-alkane) product. We report one example that achieves selectivity with respect to the distribution of product molecular weights, in which n-decane is the predominant high-molecular-weight product of the metathesis of two moles of n-hexane.
485 citations
484 citations