Synonyms:Octahydro-4a,8a-ethano-naphthalene;<4.4.2>Propellan;Tricyclo[4.4.2.0]dodecan;9,10-Aethano-decalin;
The research investigates the Diels-Alder reactions of 1,2,3,6-tetrahydrobenzocyclobutene-3,6-diones, leading to a new synthesis of [4.4.2] propellanes and the creation of novel strained cage molecules. The study explores the site selectivity of these reactions, which is influenced by both the dienophilicity of the double bonds and steric interactions. Key chemicals involved include 1,2,3,6-tetrahydrobenzocyclobutene-3,6-dione (1) and various 1,3-dienes such as butadienes (2a-e), furan (2f), anthracene (2g), cyclopentadienones (2h-i), cyclopentadiene (2j), and spiro[2,4]hepta-4,6-diene (2k). The adducts formed from these reactions, such as internal adducts 3a-e and external adducts 4j-k, were further studied through photochemical transformations to yield strained cage molecules like compounds 9-15. The research highlights the importance of steric hindrance in controlling the site selectivity of these reactions and provides insights into the properties of the resulting cage molecules.
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