5211-62-1Relevant articles and documents
Palladium(II)-catalyzed aerobic dialkoxylation of styrenes: A profound influence of an o-phenol
Schultz, Mitchell J.,Sigman, Matthew S.
, p. 1460 - 1461 (2006)
We report a Pd(II)-catalyzed aerobic dialkoxylation of styrene derivatives that requires an o-phenol. Initial scope and preliminary mechanistic studies are presented in which the o-phenol is proposed to facilitate the formation of a quinone methide intermediate. Copyright
Method for isomerizing cis-anethole by using catalyst
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Paragraph 0017; 0018, (2020/09/23)
The invention discloses a method for isomerizing cis-anethole by using a catalyst in the technical field of anethole preparation. The method comprises the following steps: 1, heating cis-anethole to 95-110 DEG C; 2, adding sodium hydrogen sulfate into the heated cis-anethole to obtain a mixture, heating the mixture for 8-10 min until the temperature of the mixture is 155-200 DEG C, and keeping thetemperature of the mixture constant for 1-1.2 hours to obtain a reaction product, wherein the weight ratio of the sodium bisulfate to the cis-anethole before heating is (1-5): 100; 3, cooling the reaction product to room temperature, carrying out liquid separation treatment to obtain a mixed solution, adding a sodium carbonate solution into the mixed solution, carrying out an oscillation reactionfor 5-6 min to obtain a neutralization solution, and separating the neutralization solution to obtain an upper-layer trans-anethole mixed solution, wherein the weight ratio of the sodium carbonate solution to the cis-anethole is (1-1.2): 10. According to the scheme, sodium hydrogen sulfate is adopted as a catalyst, isomerization of cis-anethole can be achieved by heating and stirring for 1 h at the temperature of 150-200 DEG C in the presence of sodium hydrogen sulfate, use of rare metals such as rhodium chloride is avoided, and the cis-anethole isomerization cost is greatly reduced.
Iron powder and tin/tin chloride as new reducing agents of Meerwein arylation reaction with unexpected recycling to anilines
Abdelwahab, Ahmed B.,El-Sawy, Eslam R.,Kirsch, Gilbert
supporting information, p. 526 - 538 (2020/01/08)
Simple and rapid route for Meerwein arylation reaction using iron powder or a mixture of tin/tin chloride has been developed. In the presence of iron powder, different aryl diazonium salts reacted with methyl vinyl ketone, acrylates, and isopropenyl acetate. Production of oximes was detected as the main product with acrylates or in a mixture with β-aryl methyl ketones in the case of methyl vinyl ketone. The in situ produced HNO2 from an excess of NaNO2/HCl was trapped by alkyl aryl radical to form oximes in the E configuration form. The presence of tin/tin chloride mixture in the reaction of the aryl diazonium salts with methyl vinyl ketone produced Michael products along with β-aryl methyl ketones. The predicted α-aryl methyl ketones from the reaction of isopropenyl acetate with the diazotized anilines were obtained using iron or tin/tin chloride mixture.
