Related Experiment Video
Updated: Feb 14, 2026
14:22
Free Radicals in Chemical Biology: from Chemical Behavior to Biomarker Development
Published on: April 15, 2013
20.8K
C(sp2)-H functionalization of aldehyde-derived hydrazones via a radical process
Xiaoyan Xu1, Jun Zhang, Hongguang Xia
1Department of Biochemistry and Molecular Biology, Zhejiang University School of Medicine, Hangzhou 310058, China. hongguangxia@zju.edu.cn.
Organic & Biomolecular Chemistry
|February 13, 2018
Summary
Recent advances in C(sp2)-H functionalization of aldehyde-derived hydrazones use radical processes. This method provides diverse substituted hydrazones under mild conditions with high selectivity and broad functional group tolerance.
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
- Catalysis
Background:
- C-H functionalization is a key strategy in organic synthesis.
- Aldehyde-derived hydrazones are versatile synthetic intermediates.
- Radical reactions offer unique pathways for C-H functionalization.
Purpose of the Study:
- To review recent advances in radical C(sp2)-H functionalization of aldehyde-derived hydrazones.
- To highlight the efficiency and scope of these methodologies.
- To discuss the mechanistic aspects, including the role of aminyl radicals and photocatalysis.
Main Methods:
- Radical-mediated C(sp2)-H functionalization reactions.
- Use of aldehyde-derived hydrazones as substrates.
- Employing mild reaction conditions.
- Photocatalysis under visible light irradiation in some cases.
Main Results:
- Efficient synthesis of diverse substituted hydrazones, including N-heterocycles.
- Reactions proceed under mild conditions with excellent selectivities.
- Broad substrate scope and good functional group tolerance observed.
- Aminyl radical intermediates are generally involved.
Conclusions:
- Radical C(sp2)-H functionalization of aldehyde-derived hydrazones is a powerful synthetic tool.
- The methodologies offer mild, selective, and versatile routes to valuable compounds.
- Photocatalysis provides an alternative initiation strategy for these transformations.
Related Concept Videos
01:18Preparation of Aldehydes and Ketones from Carboxylic Acid Derivatives
3.6K
Aldehydes are more reactive than carboxylic acids and hence, can get over-reduced to alcohol in the presence of strong reducing agents. Therefore, carboxylic acids are inefficient in preparing aldehydes using LAH.
Carboxylic acid derivatives like acid chlorides and esters are more easily reducible than the corresponding acids. The derivatives reduce in the presence of mild reducing agents to give aldehydes. Aldehydes can also be prepared by Rosenmund reduction, that is, the reduction of...
Carboxylic acid derivatives like acid chlorides and esters are more easily reducible than the corresponding acids. The derivatives reduce in the presence of mild reducing agents to give aldehydes. Aldehydes can also be prepared by Rosenmund reduction, that is, the reduction of...
3.6K
01:26Derivatives of the Trigonometric Functions
498
The motion of a Ferris wheel rotating at a constant speed provides an intuitive model for understanding trigonometric functions and their derivatives. As a rider moves along the circular path, the vertical height above the ground changes smoothly and periodically over time. This vertical motion can be accurately represented by a sine function, reflecting the repeating pattern of ascent and descent inherent to circular motion.Height and Rate of ChangeIf the rider’s height is modeled by a...
498
01:22Derivatives of Logarithmic Functions
108
Logarithmic and Exponential RelationshipA logarithmic function is the inverse of an exponential function. If y = logb x then, it can be rewritten as by = x. This relationship allows for implicit differentiation, making logarithmic functions useful in calculus. Logarithmic scales are widely used to represent data that span multiple orders of magnitude, such as earthquake magnitudes (Richter scale) and sound intensity (decibels).Differentiation of Logarithmic FunctionsTo differentiate y = logb x,...
108
01:29Second Derivatives of Implicit Functions
88
Elliptical arches are fundamental in architectural and structural engineering, offering aesthetic appeal and structural efficiency. The shape of an elliptical arch follows a constrained geometric relationship where the height and horizontal position are implicitly related. This means that the height y cannot be explicitly expressed as a function of the horizontal position x, necessitating implicit differentiation for slope and curvature analysis.The equation of an ellipse centered at the origin...
88
01:27Derivatives of Simple Functions
175
Derivatives quantify the rate of change of a function and can be interpreted geometrically as the slope of a straight line or the slope of a tangent line to a curve at a given point. In the context of a roller coaster, the derivative of the function describing the track’s horizontal position provides a mathematical description of how steep the path is at any location along the ride.Constant and Linear PathsA horizontal segment of a roller coaster can be modeled by a constant function,...
175
01:30Derivatives of Inverse Trigonometric Functions
439
A ship tracking an approaching aircraft relies on geometric measurements to find out the aircraft’s position relative to the observer. By measuring the slant distance to the aircraft and the angle of elevation, the horizontal and vertical components of the distance can be obtained using trigonometric relationships. This geometric approach provides a basis for analyzing how the observed angle changes as the aircraft moves closer to the ship.To examine the mathematical behavior of the angle...
439