Related Experiment Video
Updated: May 19, 2026

11:51
Facile Preparation of 4-Substituted Quinazoline Derivatives
Published on: February 15, 2016
(E)-2-[2-(3-Fluoro-phen-yl)ethen-yl]quinolin-8-yl acetate
Yan-Ping Huo1, Xiao-Li Nie, Xiao-Ming Fang
1School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, People's Republic of China.
Acta Crystallographica. Section E, Structure Reports Online
|August 21, 2012
Summary
This study details the crystal structure of C(19)H(14)FNO(2), revealing molecules linked by C-H⋯O hydrogen bonds. The quinoline system exhibits specific dihedral angles with its fluoro-benzene and acetoxy groups.
Area of Science:
- Crystallography
- Molecular structure analysis
- Organic chemistry
Background:
- Understanding molecular interactions is crucial in crystal engineering.
- The specific arrangement of functional groups dictates material properties.
Purpose of the Study:
- To elucidate the crystal structure of the title compound, C(19)H(14)FNO(2).
- To analyze the intermolecular interactions and conformational preferences within the crystal lattice.
Main Methods:
- Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
- Hydrogen bond analysis was performed to identify and quantify intermolecular interactions.
Main Results:
- The crystal structure of C(19)H(14)FNO(2) was successfully determined.
- Molecules are interconnected via C-H⋯O hydrogen bonds, forming translational chains along the b axis.
- Key dihedral angles between the quinoline system, fluoro-benzene ring, and acetoxy group were measured as 8.15° and 77.42°.
Conclusions:
- The crystal packing is significantly influenced by C-H⋯O hydrogen bonding.
- The observed dihedral angles provide insights into the molecule's conformation and potential for intermolecular interactions.
Related Concept Videos
Alkylation of β-Ketoester Enolates: Acetoacetic Ester Synthesis
Acetoacetic ester synthesis is a method to obtain ketones from alkyl halides and β-keto esters. The reaction occurs in the presence of an alkoxide base that abstracts the acidic proton of the β-keto esters. The step results in an enolate ion which is doubly stabilized. The enolate then reacts with an alkyl halide via the SN2 process to produce an alkylated ester intermediate with a new C–C bond. The hydrolysis of the intermediate, followed by acidification, results in an alkylated β-keto acid.
E2 Reaction: Kinetics and Mechanism
SN2 substitutions and E2 eliminations of alkyl halides proceed via a concerted pathway. While the nucleophile attacks the alpha carbon in SN2 reactions, it functions as a strong base and abstracts a beta hydrogen in the E2 mechanism. The rate-limiting transition state in E2 elimination reactions is characterized by partially broken carbon–hydrogen and carbon–halogen bonds and a partially formed pi bond between the alpha and beta carbons. The beta hydrogen and halide are eliminated...
E2 Reaction: Stereochemistry and Regiochemistry
Elimination reactions of alkyl halides can yield one or more alkenes depending on the specific regiochemical and stereochemical considerations. While the regiochemistry of the reaction governs the location of the double bond in the product, the stereochemical requirements often influence the geometry.
When a substrate with two different β hydrogens undergoes an E2 elimination, the presence of a strong base can yield two regioisomeric alkenes. The more-substituted alkene is the major product and...
When a substrate with two different β hydrogens undergoes an E2 elimination, the presence of a strong base can yield two regioisomeric alkenes. The more-substituted alkene is the major product and...

