Organometallic chemistry classification

MLX plot adapted from that in G. Parkin, Classification of Organotransition Metal Compounds in Comprehensive Organometallic Chemistry III—From Fundamentals to Applications, R. H. Crabtree, D. M. P. Mingos (eds.), Elsevier, 2007, Volume 1, p. 34, used with permission. 

G. Parkin, Classification of Organotransition Metal Compounds in Comprehensive Organometallic Chemistry III—From Fundamentals to Applications, R. H. Crabtree,... 

Since the electron count for a molecule of class [ML/X Z ] is given by EN = w- -2/- - , it is a simple matter to use the [ML/X Z ] classification to evaluate the distribution of molecules according to a specific electron count. Furthermore, given the prominence of the 18-electron rule in the organometallic chemistry literature, it is pertinent to use these data to address the extent to which the 18-electron rule can be considered a rule . 

The proper classification of all Pd-catalyzed reactions is important, and there are several possibilities. The classification I chose tries to achieve easy understanding by synthetic orgaific chemists. It is different from the classification used by Negishi which is based mainly on organometallic chemistry. 

The different types of Lewis acid-base interactions sorted according to their more traditional classifications in inorganic, main group, organic, coordination, and organometallic chemistry. 

The extension of this knowledge to bioorganic chemistry and organometallic chemistry is only in its early stage. The major difficulty for the search and classification of conical intersections in these systems is related to the larger molecular size and extension of the tt-systems. This calls not only for faster computers, but also for improved as well as new methodologies. These may include (i) methodologies that... 

The organic hgands of the actinide and lanthanide organometallics will be used here as an arbitrary basis of classification. The emphasis will be on the structure and bonding of these compounds rather than their S5uithetic chemistry. Several earher reviews exist which cover the chemical aspects of the organoactinides and -lanthanides [1—7). 

For a long time metal carbenes have been either classified as Fischer- or Schrock carbenes, depending on the oxidation state of the metal. Since the introduction of N-heterocycHc carbene complexes this classification needs to be extended because of the very different electronic character of these ligands. Carbenes—molecules with a neutral dicoordinate carbon atom—play an important role in all fields of chemistry today. The first examples in the field of organic chemistry were published by Doering and Hoffmann in the 1950s [1], while Fischer and Maasbol introduced them to organometallic chemists about ten years later [2,3]. But it took another 25 years until the first carbenes could be isolated [4-8]. 

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