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Abstract
The synthesis in high yield of tetraisopropyl esters of C-alkylated methylene bisphosphonic acids can be achieved by the alkylation of the thallium salts of tetraisopropyl esters of the parent methylene biphosphonic acids. Yields of C-alkylated products are markedly reduced when the tetraethyl or tetramethyl esters are used in this reaction. From a study of the 13C and 31P NMR spectra of the methylene bisphosphonates and their anions, this difference in reactivity is ascribed to steric factors.
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