Fulvene cycloaddition reactions in water: influence on rate and selectivity
作者:Axel G Griesbeck
DOI:10.1016/0040-4039(88)85194-3
日期:1988.1
The thermal cycloadditionreaction between dimethylpentafulvene and 1,4-benzoquinone or maleic anhydride was investigated under several solvent and concentration conditions. In aqueous media the reaction rates were highly accelerated and the - ratio for could be controlled from 9:1 to 1:9 depending on the formal concentration in water.
Synthese von 7-Alkyliden-tricyclo[6.3.0.02,6]undeca-4,9-dien-3,11-dionen
作者:Axel G. Griesbeck
DOI:10.1002/prac.19923340703
日期:——
The cycloaddition reaction of 6-alkyl- as well as 6,6-dialkyl substituted pentafulvenes 1a - f with 1,4-benzoquinone proceeded efficiently and highly endo-stereoselectively when water was used as the solvent. The adducts 2a - f easily underwent intramolecular photocycloaddition when irradiated in acetone or cyclohexane. The resulting trishomocubanediones 3a - f could be transformed into linearly fused tricyclopentanoids 4a - f via flash vacuum thermolysis.
GRIESBECK, AXEL G., TETRAHEDRON LETT, 29,(1988) N 28, C. 3477-3480