O-Xylene → Phenyl methane triphosphonic acid

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

There were mixed together 23.0 grams (1.0 mole) of sodium metal along with 90 cc. of xylene and 80 cc. of tetrahydrofurane and the mixture placed under a nitrogen atmosphere. There were then added over a 35 minute period 138.10 grams (1.0 mole) of diethyl phosphite using external cooling to control the reaction exotherm and maintain the temperature at 60° to 65° C. After addition was complete the mixture was heated to 100° C. and maintained there for about 1 hour until there was no more sodium. The mixture was cooled to 60° C. and there was started the addition of 64.5 grams (0.33 mole) of benzotrichloride (α,α,α-trichlorotoluene). The exothermic reaction was cooled to maintain the temperature at 60° to 65° C. during the 25 minute addition period. The mixture was heated at 70° to 75° C. for 7 hours and the sodium chloride filtered off. The product in the pot was then subjected to distillation, terminal conditions being a pot temperature of 205° C., distillate temperature 125° C. and pressure 4 mm. The solid residue in the pot was hexaethyl phenyl methane triphosphonate. This product was hydrolyzed and the hydrolysis product purified as in Example 1 to obtain phenyl methane triphosphonic acid.

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