Existence of β-diketone form of curcuminoids revealed by NMR spectroscopy was written by Prasad, Durga;Praveen, Aishwarya;Mahapatra, Sipra;Mogurampelly, Santosh;Chaudhari, Sachin R.. And the article was included in Food Chemistry in 2021.Product Details of 33171-05-0 The following contents are mentioned in the article:
Curcumin (CUR), demethoxycurcumin (DMC) and bisdemethoxycurcumin (BDMC) – the class of natural compound derived from turmeric can exist as keto-enol and beta-diketone tautomer form. The structure and dynamics of particular relevance CUR is reported in prior studies, whereas DMC and BDMC, by far, have not been scrutinized. In the present studies, we have investigated the detailed mol. structure of CUR, DMC and BDMC by employing NMR spectroscopy as a key tool. The bridging carbon as methylene in beta-diketone form and methine in keto-enol form shows significant difference in NMR spectrum. The results justified that Curcuminoids (CC) has nearly 3% of beta-diketone tautomer in DMSO solvent at 298 K. Further, results revealed that beta-diketone form was favored in alk. pH condition whereas acidic and neutral pH conditions favor keto-enol tautomer. However, at higher temperature equilibrium shift towards beta-diketone tautomer. Moreover, this is the first report by NMR for observing the presence of beta-diketone tautomer. This study involved multiple reactions and reactants, such as Bisdemethoxycurcumin (cas: 33171-05-0Product Details of 33171-05-0).
Bisdemethoxycurcumin (cas: 33171-05-0) belongs to ethers. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Polyesters are important plastics, with monomers linked by ester moieties. Acyl chlorides and acid anhydrides alcoholysis is another way to produce esters. Acyl chlorides and acid anhydrides react with alcohols to produce esters. Anydrous conditions are recommended since both acyl chlorides and acid anhydrides react with water.Product Details of 33171-05-0
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem