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Cyclobutenediones, pyrolysis

Naphthoquinones from cyclobutenediones (13, 97-98 209-120 14, 253-254 16, 102,). Liebeskind el al.] have developed a stcrcoconlrolled route to 2,3-disubslitutcd quinones from 2-alky 1-3-alkoxycyclobulenedioncs (I). Thus addition of ArLi to 1 followed by mcthylation provides 2 in 50-75% yield. Reaction of 2 with RLi followed by a quench with trifluoroacctic anhydride and NH4CI provides the cyclobutcnonc 3. These products arc converted into quinones 4 by pyrolysis at 140° followed by oxidation (CAN). [Pg.90]


See other pages where Cyclobutenediones, pyrolysis is mentioned: [Pg.173]    [Pg.524]    [Pg.71]    [Pg.447]    [Pg.462]    [Pg.42]   
See also in sourсe #XX -- [ Pg.524 , Pg.525 ]




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Cyclobutenediones

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