Citation: Chen X N, Du Z, Zhang Y, et al. Synthesis of monosubstituted N-arylamidines by divalent diaminobisphenolate ytterbium complex catalyzed addition of amines to nitriles. ) (I) has first been found to serve as a catalyst for addition of amines to nitriles to give monosubstituted N-arylamidine in moderate to good yields. The aromatic amines and nitriles showed better activity. The outcome of the addition reaction was greatly affected by the structure of divalent ytterbium complexes. The reaction mechanism was proposed and the benzonitrile-coordinated divalent ytterbium phenoxide Yb(OAr) 2 (C 6 H 5 CN)(THF) 2 (Ar = 2,6-di t Bu-4-MeC 6 H 3 ) was isolated as one of the intermediates. rare earth, aryloxide, amidine, synthesis, mechanism
Nitriles. -Three biscyclopentadienyl ytterbium or yttrium amides are prepared. Their catalytic activity in the title reaction depends on the complex metal and the amide group. Best results are obtained with YBA providing monosubstituted N-arylamidines in good to excellent yields for aromatic nitriles and amines, whereas aliphatic substrates are less suitable under the present conditions. -(CAI, T.; CHEN, X.; XU, F.; ZHANG, Y.; YAO, Y.; SHEN*, Q.; J.
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