| 摘要 |
1449443 Disubstituted phosphonates PHILAGRO 7 March 1975 [8 March 1974] 9541/75 Heading C2P [Also in Division A5] Phosphonates of the general formula in which R and R<SP>1</SP>, which may be the same or different, represent a linear or branched chain alkyl radical, which may optionally be substituted, e.g. by halogen or -OH groups, and which contains 1-18 C atoms, an optionally substituted cyclohexyl or phenyl radical or a heterocyclic radical connected to an oxygen atom adjacent the phosphorus by an aliphatic chain of 1 or 2 carbon atoms are prepared by reacting the appropriate alcohol with PCl 3 or H 3 PO 4 or by reacting a salt of a monoester of phosphonic acid with a haloformate. Exemplified are the preparation of O,O-diethyl phosphonate, O,O-di-n-propyl phosphonate, O,O-diisopropyl phosphonate, O,O-di-2-chloroethyl phosphonate, O,O-di-methoxy ethyl phosphonate, O,O-di-cyclohexylphosphonate, O,O-ditetra hydrofurfuryl phosphonate and O-methyl, O-ethyl phosphonate. |
