Alkyls organometallic chemistry

Organometallic Chemistry. Only a few organocalcium compounds have been reported. Alkyl calcium haUdes have been prepared by reaction of the hahdes and calcium ia tetrahydrofuran (17). 

The organometallic chemistry of this group developed rather slowly but there has been a surge of interest, especially in Nb and Ta, in the last decade or so. The chemistry of a alkyls or aryls is less well developed than for many other elements but [V CH(SiMe3)2 3], [V (CH2SiMe3)4], and... 

Organometallic chemistry (see p. 1199) is not particularly extensive even though gold alkyls were amongst the first organo-transition metal compounds to be prepared. Those of Au are the most stable in this group, while Cu and Ag (but not Au ) form complexes, of lower stability, with unsaturated hydrocarbons. 

Organometallic chemistry of pyrrole is characterized by a delicate balance of the ti N)- and -coordination modes. Azacymantrene is an illustration of the considerable nucleophilicity of the heteroatom. However, azaferrocene can be alkylated at C2 and C3 sites. Ruthenium and osmium, rhodium, and iridium chemistry revealed the bridging function of pyrroles, including zwitterionic and pyrrolyne complex formation. The ti (CC) coordination of osmium(2- -) allows versatile derivatizations of the heteroring. 

There is an enormous organometallic chemistry associated with the group IA metals, particularly lithium and sodium. Lithium alkyls can be prepared by the reaction of the metal and an alkyl halide,... 

Grigg, R. Sridharan, V. Transition Metal Alkyl Complexes Multiple Insertion Cascades. In Comprehensive Organometallic Chemistry II Abel, E. W., Stone, F. G. A., Wilkinson, G., Eds. Elsevier Oxford, 1995 Vol. 12, pp 299-321. 

---