phosphinates and some H-phosphonate diesters is promoted by the base DBU. Only more reactive alkyl halides react in preparatively useful yields. However, the method provides easy access to important H-phosphinate buildingblocks, without the need for a protecting group strategy or metal catalysts. The reaction is conveniently conducted at, or below, room temperature. The preparation of methyl-H-phosphinate
Process for the preparation of 2-cyanoethylphosphinic esters
申请人:Ticona GmbH
公开号:US05990337A1
公开(公告)日:1999-11-23
The invention relates to a process for the preparation of phosphorus-containing compounds of the formula (I) ##STR1## where R.sup.1 and R.sup.2 are identical or different and are a straight-chain or branched alkyl radical having 1 to 8 carbon atoms, a cyclohexyl-, cyclopentyl-, aryl-, halogen-, (C.sub.1 -C.sub.6)-alkyl- or (C.sub.1 -C.sub.6)-alkoxy-substituted aryl radical, where R.sup.1 and R.sup.2, together with the phosphorus atom and the oxygen atom, can also form a ring, in particular an oxaphosphorin ring, which comprises metering acrylonitrile at elevated temperature into a compound of the formula (II) ##STR2## where R.sup.1 and R.sup.2 are as defined above.
Preparation of phosphinic acids: Michael additions of phosphonous acids/esters to conjugated systems.
作者:John K. Thottathil、Denis E. Ryono、Claire A. Przybyla、Jerome L. Moniot、Richard Neubeck
DOI:10.1016/s0040-4039(01)81507-0
日期:——
A very mild and facile method for the preparation of phosphinicacids via Michael addition of phosphonous acids as well as esters, through an intermediate silyl alkyl phosphonite, to activated conjugated systems is described.
Synthesis of 2-keto-4-phosphorylbutyric acids and their derivatives
作者:P. V. Kazakov、I. L. Odinets、M. Yu. Antipin、P. V. Petrovskii、L. V. Kovalenko、Yu. T. Struchkov、T. A. Mastryukova
DOI:10.1007/bf00958265
日期:1990.9
The Claisen condensation of 3-phosphorylated propionitriles with diethyl oxalate has been examined. The product of the condensation of 3-(methylethoxyphosphinyl)-propionitrile, following hydrolysis, has been shown to be the enol form (Z-isomer) of 4-(methylhydroxyphosphinyl)-3-cyano-2-ketoburyric acid. On crystallizaton from water, the other isomers (the E-isomer of the enol or the keto-forms) were not isolated. Distillation of the products of silylation of the reaction mixture with hexamethyldisilazane gave both geometric isomers of the enol (Z and E). In aqueous solution, the enol gradually cyclizes to give 2-hydroxy-3-(methylhydroxyphosphinyl)-citraconimide.
On the reaction of methyl dichlorophosphine with acrylamide
作者:V. K. Khairullin、R. M. Kondrat'eva、A. N. Pudovik