91347-88-5Relevant articles and documents
Novel Selective Approach to Terminally Substituted [n]Dendralenes
Polák, Peter,Tobrman, Tomá?
supporting information, p. 957 - 968 (2018/12/11)
Dendralenes are simple alkenes with cross-conjugated double bonds that are frequently synthesized due to being potentially valuable building blocks for the synthesis of more complex structures. The synthetic approaches to dendralenes are based on the cross-coupling reactions of electrophilic and nucleophilic synthons derived from geminally substituted ethylene. Our novel methodology for the synthesis of only terminally substituted [3]- and [4]dendralenes, as well as 2,3-disubstituted buta-1,3-dienes, involves the preparation of 1,2-disubstituted cyclobutenes from readily available 2-bromocyclobutanone and the subsequent thermal ring-opening reactions.
Palladium-catalyzed ring enlargement of aryl-substituted methylenecyclopropanes to cyclobutenes
Shi, Min,Liu, Le-Ping,Tang, Jie
, p. 7430 - 7431 (2007/10/03)
Methylenecyclopropanes 1 could be converted to the corresponding cyclobutenes 2 under the catalysis of palladium acetate in the presence of metal bromide in 1,2-dichloroethane under mild conditions. A plausible reaction mechanism has been proposed on the
Preparation of aryl cyclobutenes under mild and neutral conditions
Juteau,Gareau
, p. 3795 - 3805 (2007/10/03)
Aryl cyclobutyl acetates were converted to the corresponding aryl cyclobutenes with lithium bromide in good yields (50-97%) and in high purity.
