Preparation of Alkyl Dihydrogenphosphates with Monomeric Metaphosphate Anion Generated by Photochemical C–P Bond Cleavage of<i>p</i>-Nitrobenzylphosphonic Acid
a monomeric metaphosphate anion as an intermediate. The monomeric metaphosphate anions used in this reaction were generated by a photochemical C–P bondcleavage of the p-nitrobenzylphosphonate dianion. The photolysis of a 1:2 molar mixture of p-nitrobenzylphosphonic acid and 1,8-diazabicyclo[5.4.0]undec-7-ene (or 2,2,6,6-tetramethylpiperidine) in excess alcohol gave alkyl dihydrogenphosphate in fairly
Process for the preparation of an alkali metal salt of a diester
申请人:Kao Corporation
公开号:US04736051A1
公开(公告)日:1988-04-05
A process for preparing an alkali metal salt of a phosphoric ester represented by the following general formula (III): ##STR1## wherein R.sup.1 means an organic group, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 denote individually a hydrogen atom or organic group, R.sup.2 and R.sup.4 may optionally be coupled together into a ring, and M stands for an alkali metal, which comprises reacting a monoalkali metal salt of an organophosphoric monoester, represented by the following general formula (I): ##STR2## wherein R.sup.1 and M have the same meaning as defined above, with an epoxy compound represented by the following general formula (II): ##STR3## wherein R.sup.2, R.sup.3, R.sup.4 and R.sup.5 have the same meaning as defined above.