Bonding P-elimination

The rate constants for p-elimination processes are correlated with the C-X bond strength (91,140). Thus the rate determining step in these processes involves the breaking of the C-X bond. p-Elimination... 

The first complex is the 18e species, [(Ti -indane)IrL2] formed by hydrogenation of the C=C bond by the IrH2 group, and the second is indenyl)IrHL2], formed by oxidative addition of an indane C—H bond, P elimination, then loss of H2 from the metal and oxidative addition of an indane C—H bond. Substitution only of the arene complex by CO is possible because loss of arene is easier than loss of the Cp-like n -indenyl (see Section 5.7). 

Olefln dimerization - through the intermediacy of a metallacyclopentane or by double olefin insertion into a M-H bond P-elimination. 

When a carbanionic center is engendered p to an ethereal bond, p-elimination follows readily ( icb type elimination). In the case of 7-oxanorbomane-2-carboxyUc esters, of 7-oxanorbom-2-yl alkyl ketones, of 7-oxanorbom-2-yl sul-fones, and of 7-oxanorboma-2-ones, their conjugate bases do not undergo quick P-eliminati(Hi for stereoelectronic reasons (small overlap between the HOMO of the carbanionic center and the LUMO of the adjacent ethereal moiety because of the... 

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