CsF/Clinoptilolite (CsF/CP) was found to be an efficient solid base catalyst for both S N Ar and Ullmann ether reactions. A general and efficient one-step procedure was developed for the synthesis of biaryl ethers via direct coupling of electron-deficient aryl halides to phenols using CsF/CP. The protocol was also applied to electronrich aryl halides by addition of a catalytic amount of copper oxide nanoparticles. Both S N Ar and Ullmann reactions were rapid and provided good to excellent yields.
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