Derivatives of Main-group Elements

In competition reactions of pentafluorophenyl-Iithium, and of penta-fluorophenylmagnesium bromide, with a mixture of trimethylchlorosilane and benzophenone, there is a substantial solvent effect, reaction occurring mainly with the silane in tetrahydrofuran and with the ketone in diethyl ether.  

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DERIVATIVES OF MAIN GROUP ELEMENTS Selection of parent hydrides and their names... 

As the literature published up to 1976 on hydroxamates, with special reference to transition metals, has been well reviewed,37 this account will mainly concentrate on adding a few subsequent findings in this direction along with a brief account of the hydroxamic acid derivatives of main group elements. 

Very little work has been carried out on cupferron derivatives of main group elements. Some aspects of cupferronates of tin and antimony have been studied122 with a view to developing a suitable method of extraction of the metalloids from a mixture of Sn, Sb, As and Bi. 

Depending on the synthetic target, the zirconium metallacycle does not need to be isolated, and one pot syntheses can be carried out. Addition of n-butyllithium to a THF slurry of Cp2ZrCl2 at —78 °C in the presence of the relevant alkyne, followed by warming to room temperature, generates zirconacycles. Dropwise addition of an hexane solution of a dichloride derivative of main group elements to this solution leads to a variety of heterocycles. 

Cyclopentadienylthallium compounds have demonstrated tremendous preparative potential as mild reagents for the synthesis of cyclopentadienyl derivatives of Main Group Elements, Transition Metals, md Rare Earth Elements. In fact, some aUcyl-substituted cyclopentadienyl metal complexes can be obtained only from the analogous T1(I) compounds. 

F8. Inorganic Syntheses. McGraw-Hill, New York, vols. 1-13 (1939-1972). These volumes are extremely valuable for preparations of derivatives of Main Group elements, especially of B, Si, Ge, Sn, As, and Sb. Information on particular compounds is easily located in the cumulative indexes vol. 10 (vols. 1-10) and vol. 13 (vols. 11-13). 

Fll. G. Brauer, Handbook of Preparative Inorganic Chemistry, 2nd ed. Academic Press, New York, 1963. Translation from Ger. Volume 1 contains preparative details for several organometallic derivatives of main group elements. 

Interest has also continued in the synthesis and solid-state structural characterisation of organophosphido derivatives of main group elements including aluminium,indium,zinc and cadmium,and lead. ... 

The molecular structure of ferrocene, (CsHs)2Fe, as determined by gas-phase electron diffraction is shown in Fig. 11, and the main structure parameters are listed in Table 2 along with the corresponding parameters of biscyclopentadienyl derivatives of other transition elements and some of the cyclopentadienyl derivatives of main-group elements already mentioned. The angle between the C—H bonds and the C5 ring plane,... 

The temperatures quoted are those at which decomposition becomes appreciably rapid. Presumably metal fluorides are also formed in these decompositions but this has not been proven. A reaction which is apparently the reverse of these pyrolyses was mentioned above, namely the addition of platinum-fluorine bonds to tetrafluoroethylene 118). The thermal decomposition of perfluoroalkyl and polyfluoroalkyl derivatives of main group elements such as boron, silicon, or tin was mentioned in earlier sections of this chapter. Transfer of fluorine atoms from the side chains on heating was also a characteristic property. However, it is interesting to compare the reaction (97),... 

II metals. Derivatives of main group elements and transition metals are included. All compounds are very sensitive to air and moisture. The organo-germyl metal compounds listed in Table 82 are prepared by methods from the following scheme. 

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