An improved synthetic method and the first crystal structures for (dihalomethylene)bisphosphonate partial esters
作者:Jouko J. Vepsäläinen、Jussi Kivikoski、Markku Ahlgrén、Heikki E. Nupponen、Esko K. Pohjala
DOI:10.1016/0040-4020(95)00314-x
日期:1995.6
A new general and selective strategy for the synthesis of (dihalomethylene)bisphosphonic acid (XYMBP) partial alkyl esters (PE) with high selectivity and purity has been developed. Preparation is started from selected XYMBP tetraesters using tertiary or secondary amines as dealkylating reagents leading to trialkyl or P,P′-dialkyl XYMBP PEs, respectively. The solid state structures are given for three
已开发出一种新的具有选择性和高纯度的合成(二卤代亚甲基)双膦酸(XYMBP)偏烷基酯(PE)的新的通用和选择性策略。使用叔胺或仲胺作为脱烷基剂,从选定的XYMBP四酯开始制备,分别生成三烷基或P,P'-二烷基XYMBP PE。给出了以下三种化合物的固态结构:Cl 2 C [P(O)(OPr i)(O - Na +)] [P(O)(O - Na +)2 ]和Cl 2 C [P (O)(OPr i)(O − X +)] 2,其中X = Na +或H2 Ñ +(CH 2 CH 2)2 O.
Bisphosphonic compounds VIII. A facile and selective one-pot synthesis of P,P-dialkyl (dichloromethylene)bisphosphonate partial esters
作者:Jouko Vepsäläinen、Heikki Nupponen、Esko Pohjala
DOI:10.1016/0040-4039(96)00605-3
日期:1996.5
The preparations of P,P-dialkylpartialesters of (dichloromethylene)bisphosphonic acid from readily available tetraesters with good selectivity and purity have been developed.
Bisphosphonic compounds. Part 3. Preparation and identification of tetraalkyl methylene- and (α-halomethylene)bisphosphonates by mass spectrometry, NMR spectroscopy and X-ray crystallography
The preparation and identification of tetraalkyl methylenebisphosphonates XYC[P(O)(OR)2]2; X = Y = H, Cl or Br and R = alkyl} have been studied. Detailed procedures are given for the synthesis of XYC[P(O)(OR)2]2 (X = Y = H; R = hexyl; X = Y = Cl or Br and R = Me). H-1, C-13 and P-31 NMR data are reported including 1J(CH), 2J(CP), 3J(CP) and 2J(PP) coupling constants. The fragmentation of 19 XYC[P(O)(OR)2]2 has been studied in the gas phase. The solid state structures are given for two compounds (X = Y = Cl, R = Pr(i) and X = Y = Br, R = Me).