Organic compounds -- part of the class 532-570 series – Organic compounds – Phosphorus containing
Patent
1996-11-04
1998-05-26
Geist, Gary
Organic compounds -- part of the class 532-570 series
Organic compounds
Phosphorus containing
568 17, C07F 953
Patent
active
057568480
ABSTRACT:
The invention relates to a process for preparing secondary arylphosphine oxides of the formula (I) ##STR1## in which R.sup.1 to R.sup.3, independently of one another are hydrogen, halogen, trifluoromethyl, (C.sub.1 -C.sub.6)alkyl, (C.sub.1 -C.sub.6)alkoxy, di(C.sub.1 -C.sub.6)alkylamino, or diphenylamino and R.sup.4 is (C.sub.1 -C.sub.12)alkyl, cycloalkyl or aralkyl or the grouping ##STR2## which comprises reacting arylphosphinous alkyl esters of the formula (II) ##STR3## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 have the meaning given above and R.sup.5 is (C.sub.1 -C.sub.4)alkyl, with water at elevated temperature, in a molar ratio of phosphinous ester to water of 1:1 to 1:1.5.
REFERENCES:
patent: 5298644 (1994-03-01), Regnat et al.
patent: 5312890 (1994-05-01), Davis
Justus Liebigs Annalen Der Chemie, Weinheim DE, pp. 751-764; Kleiner H.J.: "Herstellung und Umsetzungen von Dimethylphosphinoxid".
Journal Of The American Chemical Society, pp. 4026-4032, Van Der Knapp T.A.: "Oxidation Reactions of Phosphaalkenes".
M.I. Kabachnik et al, Z.M. Obshch, Khim. 55, pp. 2481-2483, (1985).
Houben-Weyl, Meth. der Org. Chemie, Band XII/1, pp. 193-195, (1963).
Geist Gary
Hoechst Aktiengesellschaft
Vollano Jean F.
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