Recommanded Product: Chloro(1,5-cyclooctadiene)(pentamethylcyclopentadienyl)ruthenium. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: Chloro(1,5-cyclooctadiene)(pentamethylcyclopentadienyl)ruthenium, is researched, Molecular C18H28ClRu, CAS is 92390-26-6, about Synthesis of 2-Alkoxy-5-methylenetetrahydropyrans: A Regioselective Ruthenium-Catalyzed C-C Coupling Reaction of Prop-2-yn-1-ols with Allyl Alcohol. Author is Derien, Sylvie; Ropartz, Loiec; Le Paih, Jacques; Dixneuf, Pierre H..
The carbon-carbon coupling of prop-2-yn-1-ols with allyl alc. is achieved in the presence of the ruthenium(II) catalyst RuCl(cod)(C5Me5). The coupling reaction is highly regioselective and leads to the HOCR2C(:CH2)CH2CH2CHO isomer and, after cyclization, to either 2-hydroxy- or 2-alkoxy-5-methylenetetrahydropyrans, at room temperature or at 80 °C, resp. It is used for the synthesis of mols. containing two and three tetrahydropyran moieties. The study of a variety of prop-2-yn-1-ols has shown the influence of the substituent at the propargyl carbon on the regioselectivity of the C-C coupling. In the case of tertiary alcs., the reaction leads to only one cyclic isomer, the 2-alkoxytetrahydropyran whereas with secondary alcs., a linear isomer is also obtained. The tetrahydropyranols are easily oxidized into lactones.
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Reference:
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method