18409-20-6Relevant articles and documents
Cobalt-Catalyzed Diastereo- And Enantioselective Reductive Allyl Additions to Aldehydes with Allylic Alcohol Derivatives via Allyl Radical Intermediates
Wang, Lei,Wang, Lifan,Li, Mingxia,Chong, Qinglei,Meng, Fanke
, p. 12755 - 12765 (2021/08/30)
Catalytic generation of ambiphilic π-allyl-metal complexes and their utility in enantioselective transformations constitutes a powerful approach for introduction of allyl groups to a molecule. Herein an unprecedented cobalt-catalyzed highly site-, diastereo-, and enantioselective protocol for stereoselective formation of nucleophilic allyl-Co(II) complexes followed by addition to aldehydes is presented. The reaction features diastereo- and enantioconvergent conversion of easily accessible allylic alcohol derivatives to diversified enantioenriched homoallylic alcohols with a remarkably broad scope of allyl groups that can be introduced. Mechanistic studies indicated that allyl radical intermediates were involved in this process. These new discoveries establish a new strategy for development of enantioselective transformations through capture of radicals by chiral Co complexes, pushing forward the frontier of Co complexes for enantioselective catalysis.
Cobalt-catalyzed versus uncatalyzed intramolecular Diels-Alder cycloadditions
Biletskyi, Bohdan,Tenaglia, Alphonse,Clavier, Hervé
supporting information, p. 103 - 107 (2017/12/28)
The intramolecular [4+2] cycloadditions of dienynes was investigated using cobalt-based catalysts. Substrates without substitution on alkyne moiety were found to react under thermal activation. The use of a cobalt salt as catalyst made reactions cleaner by limiting the formation of byproducts. Cycloadditions with dienynes possessing a substituent on the alkyne pattern occurred only in presence of a cobalt catalyst which displayed a moderate to good activity depending on the substrate patterns.
Aggregation behavior of tetraenoic fatty acids in aqueous solution
Wang, Yonghui,Ma, Jianguo,Cheon, Hwan-Sung,Kishi, Yoshito
, p. 1333 - 1336 (2008/04/05)
(Chemical Equation Presented) Why so blue? Unique blue-shifted UV absorptions were used to follow the aggregation of C24 tetraene fatty acids in aqueous solution. Aggregation takes place through three distinct states (i.e. K→T1→T2; see picture). It is suggested that all of these aggregates are lamellar-type in a local sense but differ in the packing mode of the fatty acid backbone.
