Organometallic complexes azoles

Organometallic Complexes of Polyheteroatom Azoles Other than Pyrazole... 

The third chapter of Volume 83 of Advances in Heterocyclic Chemistry is Part 5 in the series by Alexander Sadimenko (Fort Hare, Republic of South Africa) and covers organometallic complexes of azoles other than pyrazoles. This chapter continues the series of which parts 1-4 were published in volumes 78, 79, 80, and 8l of Advances in Heterocyclic Chemistry, respectively. 

Organometallic Complexes of Boron, Silicon, and Phosphorus Analogues of Azoles... 

The first chapter covers organometallic complexes of boron, silicon, and phosphorus analogs of azoles. This chapter continues the series by A. P. Sadimenko (Fort Hare, South Africa) in which he is treating comprehensively organometallic complexes of heterocyclic compounds. So far, he has covered, in the volumes of AHC indicated, complexes of the following heterocycles ... 

Sadimenko, A. P., Organometallic Complexes of Polyheteroatom Azoles Other than Pyrazole, 83, 117. 

Organometallic complexes of polyheteroatom azoles other than pyrazole 02AHC(83)117. 

Organometallic complexes of phosphorus analogs of azoles 03AHC(85)1. 

Heterocycles with endo- and exo Si-Si multiple bonds 04YGK94. Hydrazide-based hypercoordinate silicon compounds (Si-helates) 04MI4. Organometallic complexes of silicon analogs of azoles 03AHC(85)1. Relationship between photophysical properties and conformation of cyclic oligosi-lanes with two or more silicon atoms 02YGK762. 

Arenes and heteroarenes which are particularly easy to metalate are tricarbo-nyl( 76-arene)chromium complexes [380, 381], ferrocenes [13, 382, 383], thiophenes [157, 158, 181, 370, 384], furans [370, 385], and most azoles [386-389]. Meta-lated oxazoles, indoles, or furans can, however, be unstable and undergo ring-opening reactions [179, 181, 388]. Pyridines and other six-membered, nitrogen-containing heterocycles can also be lithiated [59, 370, 390-398] or magnesiated [399], but because nucleophilic organometallic compounds readily add to electron-deficient heteroarenes, dimerization can occur, and alkylations of such metalated heteroarenes often require careful optimization of the reaction conditions [368, 400, 401] (Schemes 5.42 and 5.69). 

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