Unsymmetric Tetraorganolead Compounds

The metal cleavage reaction is an important synthetic approach to the reactive R3PbM derivatives. In turn, these latter compounds are useful intermediates for the preparation of unsymmetrical tetraorganolead compounds. 

Listing of oxygen substituted unsymmetric tetraorganolead compounds concludes in Table 277-... 

This chapter comprises unsymmetric unsubstituted tetraorganolead compounds containing olefinlc substituents, all listed in Table 27 derivatives with additional functions may be found in Tables 275"278. The tetraorganolead compounds listed in Tables 275"279 prepared by methods from the following scheme. 

This chapter includes unsymmetric unsubstituted tetraorganolead compounds containing acetylenic substituents derivatives with additional functional groups may be found in Tables 276-279. 

Organolead-alkali compounds are the least stable of the group-IVB-alkali compounds. They are thermolabile and air and moisture sensitive but are stabilized in such donor solvents as Et O, tetrahydrofuran (THF) or NHj. Information on their isolation is sparse and no physical properties of pure R PbM (M = alkali metal) or R2PbM2 are available. Nevertheless, RjPbM in situ is a powerful tool for synthesizing unsymmetrical RjPbR tetraorganoleads ... 

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