Methylparaben synthesis
- Product Name:Methylparaben
- CAS Number:99-76-3
- Molecular formula:C8H8O3
- Molecular Weight:152.15
Yield:99-76-3 99.3%
Reaction Conditions:
with oxygen at 80; under 3750.38 Torr; for 4 h;Sealed tube;Temperature;Reagent/catalyst;Pressure;
Steps:
1-5 Example 4
(1) In a stainless steel jacketed pressure batch reactor, adding a ratio of p-hydroxybenzaldehyde to methanol of 1:100, and adding a nano-cobalt supported CexMe1-xO2 solid solution catalyst with [Rpy]+ [PF6]- The mass ratio of the ionic liquid is 1:10. After the reaction device is sealed,First, oxygen was introduced to 0.5 MPa, the oxygen flow rate was 10 mol/min, and then the circulating water bath was heated at a temperature of 80 ° C, stirring was started, and the reaction was started. After the reaction for 4 hours, the intake and the agitation were stopped, the heating was turned off, the circulating cold water was introduced, and the temperature was lowered to vent the air.(2) The reaction solution is poured into a clean single-mouth flask, and excess methanol is distilled off by vacuum distillation, and the remaining portion is poured into a beaker, and an appropriate amount of 2 to 10% sodium carbonate solution is added Cooling and crystallization, the obtained white solid can be washed with deionized water.Drying yields pure methylparaben.The yield of methylparaben was determined to be 99.3 %.
References:
CN110105207,2019,A Location in patent:Paragraph 0016-0030
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