ChemicalBook CAS DataBase List Quercetin

Quercetin synthesis

5synthesis methods

Product Name:Quercetin
CAS Number:117-39-5
Molecular formula:C15H10O7
Molecular Weight:302.24

153-18-4
605 suppliers
$6.00/10g

117-39-5
516 suppliers
$5.00/1g

Yield:117-39-5 95.6%

Reaction Conditions:

with sulfuric acid in lithium hydroxide monohydrate at 100; for 3 h;

Steps:

2.5.2. Quercetin (2)

A solution of the rutin (15 g, 24.57 mmol) in 6% H₂SO₄ /H₂O (v/v,500 mL) and the reaction mixture was heated at 100 °C for 3 h. At the end of the reaction period, the solution was cooled and the precipitated solid was filtration and collection. The residue was dissolved in ethanol (40 mL) and reflux for 1 h. The reaction solution was cooled and poured into ice water (200 mL). A solid was precipitated, filtration, collection and dried. Quercetin was obtained as a light green solid (7.1 g, 95.6%). ¹H NMR (400 MHz, (CD₃)₂SO) δ 12.46 (s, 1H), 7.64 (d, J = 2.1 Hz, 1H), 7.52 (dd, J = 8.5, 2.1 Hz, 1H), 6.87 (d, J = 8.5 Hz, 1H), 6.40 (d, J = 2.0Hz, 1H), 6.17 (d, J = 2.0 Hz, 1H). ¹³C NMR (100 MHz, (CD₃)₂SO) δ 176.3, 164.3, 161.1, 156.6, 148.1, 147.3, 145.5, 136.2, 122.4, 120.5,116.1, 115.5, 103.5, 98.7, 93.8.

References:

Zhang, Yinan;Zhang, Xiaoting;Xiao, Zhiyi;Zhang, Xinying;Sun, Hua [Fitoterapia,2022,vol. 156,art. no. 105083]