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Modified Ullmann condensation

In the laboratory of K.C. Nicolaou, a novel mild method for the preparation of biaryl ethers was developed. The di-ort/70-halogenated aromatic triazenes underwent efficient coupling with phenols in the presence of CuBr. This mild modified Ullmann condensation was utilized in the synthesis of the DOE and COD model ring systems of vancomycin. [Pg.465]

Cuprous oxide was found superior to other copper species as reagent and catalyst for (he preparation of diaryl ethers by a modified Ullmann condensation, ... [Pg.88]

Polymers with di(carbazol-3-yl)phenylamine and A,A -di(carbazol-3-yl)-iV,iV -diphenyl-l,4-phenylenediamine units in the main chain can be synthesized by a modified Ullmann condensation. The mechanism is shown schematically in Figure 1.4. The glass transition temperatures range from 102 to 216 °C. [Pg.5]

The Modified Ullmann Reaction (Ullmann-Condensation-Type Arylations)... [Pg.118]

Ugi condensation, asym. 43, 700 Ullmann-Goldberg reaction, modified 44,391... [Pg.260]

See other pages where Modified Ullmann condensation is mentioned: [Pg.412]    [Pg.464]    [Pg.1572]    [Pg.128]    [Pg.412]    [Pg.464]    [Pg.1572]    [Pg.128]    [Pg.58]    [Pg.118]    [Pg.271]    [Pg.2]   
See also in sourсe #XX -- [ Pg.465 ]



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