Studies on the reuse of recovered ethanol from benoral refining in natural medicinal chemistry experiments was written by Yuan, Chunling;Jia, Yunhong;Wang, Yajuan. And the article was included in Liaoning Yixueyuan Xuebao in 2012.Application of 5003-48-5 The following contents are mentioned in the article:
Objective: To study the reused of recovered ethanol that has been used in refining of benoral in natural medicinal chem. experiments Methods: Vacuum distillation of waste ethanol was used in the refining of benoral. 100 G crude rhubarb powder was weighted, 300 mL ethanol was extracted by heat reflux, and TLC was used to identify the extracted and separated anthraquinone glycosides. Results: Rf values between the spot evolved resp. by extraction I extracted by various proportion ethanol and the spot of standard reagent rhein were the same, Rf values between the spot evolved resp. by extraction II extracted by various proportion ethanol and the spot of standard reagent emodin were the same. Evolved extraction III had two spots resp., Rf values between one spot and of standard reagent chrysophanol were the same. The other spot’s Rf value and the spot of standard reagent physcion’s Rf value were the same, which preliminarily confirmed that there was rhein in the extraction I, emodin in the extraction II, chrysophanol and physcion in the extraction III, and there was no impurity spot. Conclusion: The recovery of waste ethanol used in the refining of benoral can be used in extraction of Anthraquinone glycosides. This study involved multiple reactions and reactants, such as 4-Acetamidophenyl 2-acetoxybenzoate (cas: 5003-48-5Application of 5003-48-5).
4-Acetamidophenyl 2-acetoxybenzoate (cas: 5003-48-5) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Application of 5003-48-5
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics