In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called A General Method for the Synthesis of Unsymmetrically Substituted Ureas via Palladium-Catalyzed Amidation, published in 2009-02-19, which mentions a compound: 894086-00-1, Name is 5-(di-tert-Butylphosphino)-1′,3′,5′-triphenyl-1’H-1,4′-bipyrazole, Molecular C32H35N4P, Application of 894086-00-1.
A general and practical method for the preparation of unsym. substituted ureas, e.g., I (R1 = H, Me, MeO, CN, NO2; R2 = Ph, Bn, c-hexyl, n-Bu), has been developed utilizing palladium-catalyzed amidation. Both aryl bromides and chlorides, as well as heteroaryl chlorides, have been coupled to aryl, benzyl, and aliphatic ureas by using a novel non-proprietary bipyrazole ligand (bippyphos).
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