Relative reactivities of tetraalkyl esters of methylene bisphosphonic acid
作者:David W. Hutchinson、Graeme Semple
DOI:10.1016/s0022-328x(00)99591-3
日期:1986.1
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
C-烷基化的亚甲基双膦酸的四异丙酯的高产率合成可以通过母体亚甲基双膦酸的四异丙酯的th盐的烷基化来实现。当在该反应中使用四乙基或四甲基酯时,C-烷基化产物的产率显着降低。通过对亚甲基双膦酸酯及其阴离子的13 C和31 P NMR光谱进行研究,发现这种反应性差异归因于空间因素。
HUTCHINSON, D. W.;SEMPLE, G., J. ORGANOMET. CHEM., 1985, 291, N 2, 145-151