Tautomeric metallotropic

The positions of metallotropic tautomeric equilibria can also be strongly solvent-dependent [160-163], Metallotropic transformations of the (T,(T-type are related to prototropic tautomeric equilibria whereby the mobile hydrogen atom is replaced by an organometallic group. Metallotropic reactions also include n,n- and <7,7i -transitions depending on the nature of the bond formed by the metal [160], Two examples of a,a-type metallotropic equilibria will conclude this Section. 

Chemistry of Small Carbohydrates - Equilibrium Solution Properties, Pure Appl. Chem. 59, 1189 (1987) and references dted therein. [160] L. A. Fedorov, D. N. Kravtsov, and A. S. Peregudov Metallotropic Tautomeric Transformations of the a, a-Type in Organometallic and Complex Compounds, Usp. Khim. 50, 1304 (1981) Russ. Chem. Rev. 50, 682 (1981). 

Similar reactions occur with a-chloromercury ketones. Reactions of type (a) are less representative than those of type (b) acyl chlorides, aryl sulfonyl chlorides, and dialkylchlorophosphites react according to type (b) and display reaction site transfer. Is this a result of keto-enol tautomerism ( mercurotropy ) Can metallotropic tautomerism occur Or, alternatively, can the ambivalent behavior be explained by reaction site transfer, which in this case involves the a, 77-conjugated system ... 

A novel type of metallotropic tautomerism, that is, reversible and equilibrium isomerization of 5-bis(Me3Si-fluorenyl)-rare earth metal complexes to 776-bis(Me3Si-fluorene-AlR3)-rare earth metal complexes, has been reported. 

Molecular design of tautomeric systems 81ACR210 77MI3. Metallotropic tautomerism in heterocyclic complexes 81 UK 1304. Ring-chain tautomerism of heteroeycies 85MI13 78MI7. 

Ustynyuk, Yu. A., Carbon-Carbon Metallotropic Tautomerism, in Reutov, O. A., Advances in Organometallic Chemistry, Moscow 1984, pp. 30/72. 

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