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Synthesis of zwitterionic phosphapalladacycles: unusual reactivity pattern of six-membered P,N-chelates

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journal contribution
posted on 28.06.2018, 18:20 by László Szi-Ferenc, Zsófia Császár, György Lendvay, Attila Bényei, Szabolcs Balogh, Balázs Nánási, Gergely Farkas, József Bakos
A cyclometalation motif has been discovered in the unprecedented reaction of Pd­(II) precursors with simple pentane-2,4-diyl based aminoalkyl-phosphines. The unique six-membered zwitterionic palladacycles can easily be synthesized in the presence of 1 molar equiv of oxidant in high yields in a pure form. A comparison between the analogous ligands of different tether lengths revealed that the formation of the zwitterionic palladacycles is the exclusive privilege of the six-membered rings.