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(R3P)2NiCl2 and LiP(SiMe3)2 react in a complex reaction sequence finally yielding (R3P)2Ni(PSiMe3)2 (5), containing a three-membered PNiP ring system, and [R3PNiP(SiMe3)2]2 (6), containing a (PNi)2 four-membered ring system with a nickel-nickel bond, respectively. NMR data are reported.doi:10.1515/znb-1979-1003 fatcat:57rp6pybjnfzxkr4rckdunyg2a