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Kinetic study of synthesizing (4‐methyl) methyl benzoatyltriphenyl phosphonium bromide in a two‐phase reaction

Abstract In this work, a novel phase‐transfer catalyst (4‐methyl)methylbenzoatyl‐phosphonium bromide (BrPPh3CH2(C6H4)COOCH3, MBPB), which can be applied to synthesize specialty chemicals via Wittig reaction, is first prepared from the two‐phase solution. The MBPB catalyst is first synthesized from the organic‐phase reaction of (4‐methyl)me‐thyl benzoate (BME) with triphenyl phosphine (PPh3) to produce the desired catalyst (4‐methyl)methylbenzoatyl phosphonium bromide (MBPB), which is then transferred to the aqueous phase. Thus, the reaction of synthesizing MBPB was carried out in an aqueous solution/organic solvent two‐phase medium. A kinetic model of the reaction was also developed. The investigation considered the effects on the conversion of reaction conditions, including organic solvents, agitation speed, the concentration of triphenyl phosphine (PPh3), the concentration of (4‐methyl)methyl benzoate (BME), and the temperature. It was found that the rate constants for the two‐phase solution (kT ) is larger than that of the rate constant (ks ) for the single‐phase solution. In addition, there is discussion of the distribution coefficient of MBPB between aqueous phase and organic phase, in which its value was measured experimentally, as affected by the concentration of MBPB in the aqueous phase and in the organic phase.