Related Experiment Video

Updated: Apr 26, 2026

Author Spotlight: Optimization of Processing Technology for Tiebangchui with Zanba Based on CRITIC Combined with Box-Behnken Response Surface Method
09:16

Author Spotlight: Optimization of Processing Technology for Tiebangchui with Zanba Based on CRITIC Combined with Box-Behnken Response Surface Method

Published on: May 12, 2023

1.6K

[Chemical constituents from root bark of Dictamnus dasycarpus]

Yuan-Yuan Bai, Wen-Zhao Tang, Xiao-Jing Wang

    Zhong Yao Cai = Zhongyaocai = Journal of Chinese Medicinal Materials
    |August 7, 2014
    PubMed
    Abstract

    More Related Videos

    Preparation of Gynura bicolor DC samples for High-Resolution Tandem Mass Spectrometry07:16

    Preparation of Gynura bicolor DC samples for High-Resolution Tandem Mass Spectrometry

    Published on: February 2, 2024

    1.1K
    Author Spotlight: Exploring the Mysteries of Sichuan's Herbal Medicine in Chinese Medicine Research03:48

    Author Spotlight: Exploring the Mysteries of Sichuan's Herbal Medicine in Chinese Medicine Research

    Published on: March 1, 2024

    1.9K

    Related Concept Videos

    1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism01:37

    1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism

    Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
    3.2K
    Diels–Alder Reaction: Characteristics of Dienes01:29

    Diels–Alder Reaction: Characteristics of Dienes

    The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
    Characteristics of the diene
    Conformation
    The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is...
    3.7K
    Intramolecular Claisen Condensation of Dicarboxylic Esters: Dieckmann Cyclization01:13

    Intramolecular Claisen Condensation of Dicarboxylic Esters: Dieckmann Cyclization

    Dieckmann cyclization is an intramolecular Claisen condensation of diesters. The reaction occurs in the presence of a base and generates a cyclic β-ketoester as the final product. Commonly, 1, 6 and 1, 7-diesters are preferred substrates for the reaction since the generated five, and six-membered cyclic β-keto esters are particularly more stable.
    2.2K
    1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview01:26

    1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview

    Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
    The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
    1.9K
    Diazonium Group Substitution: –OH and –H01:19

    Diazonium Group Substitution: –OH and –H

    Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
    1.9K
    Loss of Carboxy Group as CO2: Decarboxylation of Malonic Acid Derivatives01:35

    Loss of Carboxy Group as CO2: Decarboxylation of Malonic Acid Derivatives

    Just like β-keto acids—which upon thermal decarboxylation form ketones—β-dicarboxylic acids undergo decarboxylation to generate monocarboxylic acids with the liberation of carbon dioxide.
    1.8K