alexa Fragmentation Study of Substituted Chalcones: Gas Phase
ISSN: 2329-6798

Modern Chemistry & Applications
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Research Article

Fragmentation Study of Substituted Chalcones: Gas Phase Formation of Benz-1-oxin Cation

Abdul Rauf Raza1*, Aeysha Sultan1, Nisar Ullah2, Muhammad Ramzan Saeed Ashraf Janjua1,2 and Khalid Mohammed Khan3
1Ibn e Sina Block, Department of Chemistry, University of Sargodha, Sargodha-40100, Pakistan
2Chemistry Department, King Fahd University of Petroleum and Minerals, Dhahran-31261, Saudi Arabia
3HEJ Research Institute of Chemistry, International Centre for Chemical & Biological Sciences, University of Karachi, Karachi-75270, Pakistan
Corresponding Author : Abdul Rauf Raza
Ibn e Sina Block
Department of Chemistry
University of Sargodha
Sargodha-40100, Pakistan
Tel: +92-48-9230- 811-15 (Ext. 353)
Fax: +92-48-9230-799
Received January 18, 2016; Accepted February 03, 2016; Published February 08, 2016
Citation: Raza AR, Sultan A, Ullah N, Janjua MRSA, Khan KM (2016) Fragmentation Study of Substituted Chalcones: Gas Phase Formation of Benz-1- oxin Cation. Mod Chem appl 4:173. doi:10.4172/2329-6798.1000173
Copyright: © 2016 Raza AR, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


The mass spectra of a number of substituted chalcones have been observed to show intense M - X peaks (where X=Cl, Br, OH, OMe), which largely arise through the loss of an ortho-substituent from the ring-A of chalcones. The base peak is attributed to highly resonance stabilized benz-1-oxin cation, which would be formed via modified McLafferty rearrangement in gas phase (70 eV). The exact mass measurement of such fragments and DFT studies supports the formation and stability of benz-1-oxin cation. This protocol may also be conveniently used to distinguish among different positional isomers of substituted chalcones.


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