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Olefins three-atom tethers

Intramolecular cycloaddition of nitrile ylides to olefinic dipolarophiles linked to the dipole by a three-atom chain leads to pyrazoles fused to five-membered rings. Work on stereoselectivity in such reactions has been carried out using the reactant 266 in which the alkene moiety is linked to the C-terminus via a tether that incorporates an enantiomerically pure (R) stereogenic group (165). Both diastereo-isomers 267 and 268 were isolated and it was found that the reaction showed moderate stereoselectivity favoring 267. [Pg.512]


See other pages where Olefins three-atom tethers is mentioned: [Pg.132]    [Pg.1385]    [Pg.1385]    [Pg.16]    [Pg.272]    [Pg.270]    [Pg.7687]   
See also in sourсe #XX -- [ Pg.512 ]

See also in sourсe #XX -- [ Pg.512 ]




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