Organic Syntheses under High Pressure: Lanthanide-Catalysed [4 + 2]Cycloaddition of 1-Methoxybuta-1,3-diene to Carbonyl Compounds

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Abstract
High-pressure [4+2]cycloaddition of 1-methoxybuta-1,3-diene to carbonyl compounds is described. The pressure required is successfully reduced to 10 kbar with the use of a lanthanide catalyst.