37830-90-3Relevant articles and documents
MONOETHYLENICALLY UNSATURATED MONOMERS AND USES THEREOF
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Paragraph 0280-0283, (2021/06/22)
The invention relates to a monoethylenically unsaturated monomer of formula (I), and to the use thereof for producing a polymer. The invention also relates to the polymer obtained by polymerising said monomer, and to the use thereof in a composition for producing coatings.
Method for preparing 4,5-dimethyl-1,3-dioxol-2-one
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Paragraph 0023-0026, (2021/07/24)
The invention provides a method for preparing 4,5-dimethyl-1,3-dioxol-2-one by using diphenyl carbonate as a high-activity green carbonyl source, which comprises the following steps: adding 2,3-butanediol and diphenyl carbonate as raw materials into an organic solvent, and carrying out heat preservation and stirring reaction under the action of a catalyst; and carrying out reduced pressure distillation on an obtained reaction solution to remove a solvent, further conducting recrystallizing to obtain high-purity 4,5-dimethyl-1,3-dioxol-2-one, washing the recrystallized mother solution by using alkali liquor, conducting separating to obtain a water phase, and then adjusting the pH value of the water phase to 5-7 to recover phenol. Through the process technology, the method has the advantages of simplified production process, mild reaction conditions, high product purity, safety, environmental protection and low production cost, and diphenyl carbonate can be regenerated through a byproduct phenol.
Method for synthesizing 4, 5-dimethyl-1, 3-dioxole-2-one
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Paragraph 0020-0023, (2020/05/01)
The invention discloses a method for synthesizing 4, 5-dimethyl-1, 3-dioxole-2-one, which comprises the following steps: step 1, cyclizing 2, 3-butanedione and triphosgene to obtain 4, 5-dichloro-4, 5-dimethyl-1, 3-dioxole-2-one, and carrying out dechlorination on the 4, 5-dichloro-4, 5-dimethyl-1, 3-dioxole-2-one under the action of a reduction reagent to prepare 4, 5-dimethyl-1, 3-dioxole-2-one.The method is mild in condition, simple and efficient.