Facile high yielding synthesis of symmetric esters of methylenebisphosphonic acid
摘要:
The 1H-tetrazole catalyzed coupling of methylenebis(phosphonic dichloride), CH2(POCl2)(2), with primary alkyl, cyclic secondary alkyl, aromatic, and silicon- and fluorine-containing alcohols selectively affords symmetric P,P'-dialkyl partial esters as wen as homoleptic and mixed tetraesters. Two partial ester intermediates, methylenebis(2-ethylhexyl phosphonic chloride) and 2-ethylhexyl methylenebisphosphonic trichloride, were observed by H-1- and P-31 NMR spectroscopy in the esterification of CH2(POCl2)(2) with 2-ethyl-1-hexanol. (C) 2001 Elsevier Science Ltd. All rights reserved.
Facile synthesis of symmetric esters of alkylenebisphosphonic acids
申请人:——
公开号:US20030060648A1
公开(公告)日:2003-03-27
A facile synthesis of symmetric esters of C
1
-C
10
alkylenebisphopsphonic acids is disclosed in which a C
1
-C
10
alkylenebis(phosphonic dichloride) is reacted with an alcohol in the presence of a catalytic amount of 1H-tetrazole and a base in an aprotic solvent to form a first reaction mixture. The first reaction mixture is maintained for a time period sufficient to form a C
1
-C
10
alkylenebis(chloro ester phosphonate) that is reacted under basic conditions with an excess of a hydroxylated compound to form a second reaction mixture that is itself maintained for a time period sufficient to form a C
1
-C
10
alkylenebis(ester phosphonate) partial ester, homoleptic tetraester or mixed tetraester. The material so formed can be recovered or used as is.
Facile high yielding synthesis of symmetric esters of methylenebisphosphonic acid
作者:Dominique C Stepinski、Derek W Nelson、Peter R Zalupski、Albert W Herlinger
DOI:10.1016/s0040-4020(01)00846-8
日期:2001.10
The 1H-tetrazole catalyzed coupling of methylenebis(phosphonic dichloride), CH2(POCl2)(2), with primary alkyl, cyclic secondary alkyl, aromatic, and silicon- and fluorine-containing alcohols selectively affords symmetric P,P'-dialkyl partial esters as wen as homoleptic and mixed tetraesters. Two partial ester intermediates, methylenebis(2-ethylhexyl phosphonic chloride) and 2-ethylhexyl methylenebisphosphonic trichloride, were observed by H-1- and P-31 NMR spectroscopy in the esterification of CH2(POCl2)(2) with 2-ethyl-1-hexanol. (C) 2001 Elsevier Science Ltd. All rights reserved.