Cyclic phosphonites
AssigneeSociete Nationale Elf Aquitaine
InventorsSylvain Juge, Yvonne Legras
Life of this patent
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Abstract
New cyclic phosphonites, in which one of the oxygen atoms of the ring can be replaced by an atom of sulphur or nitrogen; the molecule has an asymmetry due to at least two carbon atoms, one or more nitrogen and/or oxygen atoms or several of these elements together. Preparation of these phosphonites by the reaction of a dihalogeno-phosphine with a compound having two active H atoms, in the presence of a hydracid acceptor. Application of the new phosphonites to the production of the corresponding phosphinates and phosphine oxides.
Claims14
Cyclic phosphonite of the formula ##STR36## or 5 to 11 ring elements wherein R is C.sub.1 to C.sub.6 alkyl, C.sub.5 to C.sub.6 cycloalkyl or phenyl,
- R.sup.1 is selected from H, C.sub.1 to C.sub.6 alkyl, C.sub.5 to C.sub.6 cycloalkyl or nitrophenyl;
- R.sup.2 is H, C.sub.1 to C.sub.6 alkyl, C.sub.5 to C.sub.6 cycloalkyl, allyl or phenyl;
- R.sup.3 and R.sup.4 are independently H, C.sub.1 to C.sub.6 alkyl or phenyl;
- Y is a bond, --NHC(O)CH.sub.3 or --NHC(O)CHCl.sub.2 substituted methylene, dimethyl bornanyl or a cyclopentene derivative, the molecule has an asymmetry with respect to a plane perpendicular to the plane of the formula passing through R, P and Y, characterized in that the ratio between the molecular weight M.sub.1 of the part of the molecule located on one side of this plane and the molecular weight M.sub.2 on the part of the molecule located on the other side of this plane is at least 3 or not greater than 1/3.
Dependencies are inferred from the claim text.