Ni Organonickel Compounds

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The arrangement of the material follows essentially that used in the previous volumes: the compounds are first divided according to their nUclearity (mononuclear, dinuclear, etc.) and within these divisions are arranged according to the number (n) of C atoms associated with an organic ligand (L) which are attached directly to the metal atom whereby priority is given to that organic ligand having the highest number of attachments, i. e. Cp (5L)> Me CL). Other groups - donor ligands (nO), anionic groups (X), and metal atoms (M) - are then included. For example, (lj3_C H)Ni(PPh)Br and (lj3_C H bNiPMe are regarded as 3 5 3 3 5 3 eL)Ni(20)X and eLbNi(20) compounds, respectively, and have been included in the chapter devoted to the eL)Ni compounds (Chapter 1. 3) while CpNi(CH2=CH2)Me is regarded as a (5L)(2L)C L)Ni compound and is included in the chapter devoted to the (5L)Ni compounds (Chapter 1. 5). The only important departure from this system is that we have chosen to regard CO, isonitrile, and ylids as 20 donor ligands (and not as 1 L organic ligands) in those compounds in wh ich other organic ligands are present. For example, CpNi(CO)SiMe3 is treated as a (5L)Ni(20)X compound whereas (CObNi(PPh C H PPh) is regarded as a CLhNi(20_20) 2 2 4 2 compound. We have also taken some liberties with the definition of a dinuclear species.