Dr. P. A. Unnikrishnan


Dr. P. A. Unnikrishnan
Assistant Professor in Organic Chemistry
Department of Applied Chemistry

e-mail: paunni (at)
Ph. +91 98462 95151

Profile          Citations


  • CUSAT, Ph. D. 1989
  • CUSAT, M.Sc. 1981
  • University of Kerala, B.Sc. 1979


  • Lectuter/Assistant Professor, Dept. of Applied Chemistry 2001-
  • Technical Officer, CUSAT, 1985-2001


  • Synthetic and Mechanistic Organic Chemistry


  • Synthesis and transformations
  • Development of novel reagents

Ph. D.– awarded

  1. Novel [3+2]annulation reaction of Nitrones with Burgess Reagent and a few related reactions, Sajitha T. S., September, 2014.
  2. Synthesis and Photochemical Transformations of a few Tethered Barrelenes, Eason M. Mathew,  January, 2014.
  3. Photochemical and Photophysical Studies of a few Bischromophoric Systems, Gisha George, September, 2010. 

Ph. D.- ongoing

  1. Synthesis and Transformations of few amine appended anthracenes and related compounds, Tomson Devassia.
  2. Design and synthesis of selected targets with desired properties: Bischromophoric systems, Shandev, P. P.
  3. Photochemical and Photophysical Studies of a few multichromophoric Systems, Saumya T. S.
  4. Synthesis and reaction of a few 9-alkenylanthraene derivatives and its reaction towards insitu generated benzyne, Aswathi C. S.


  1. “Synthesis and Applications of Novel Cyclic Burgess Reagent Analogues.”- CSIR-funded research project (Coinvestigator, Completed in 2004)
  2. “Investigations on controlling the selectivity of photochemical transformations.”- DRDO- supported research project (Coinvestigator, Completed in 2006).
  3. “An Improved Method for the Synthesis of Nitriles with PEG-Supported Burgess Reagent.”- CSIR- aided research project (Principal Investigator, ongoing).
  4. “Sigmatropic rerrangements in the synthesis of flavour and fragrance substances” – UGC funded minor research project (Principal Investigator, completed in 2003) 

Membership in Academic /University bodies

Member, Board of Studies, Applied Chemsitry

Organization of seminar /symposia

• Coordinator of the workshop National Science Day-2014 (Sponsored by KSCSTE, Kerala and Supported by DST, Government of India), 15 February 2014.
• Convener of the National Symposium on Current Trends in In Organic Chemistry, CTriC-2008” held at the Department of Applied Chemistry, Cochin University of Science and Technology, Kochi during 16-17 January 2008.
• Coordinator of the seminar on Quality enhancement education through Concurrent instructional services, CUSAT, 20 December 2005.
• Coordinator of the workshop on e-Learning ( e-Lcusat2002) CUSAT, May 2002.


  1. Metal-free synthesis of highly substituted quinolines under mild conditions, Rakesh Natarajan, Peruparambil A. Unnikrishnan, Sandhya Radhamani b, John P. Rappai ,Sreedharan Prathapan., Tetrahedron Lett., 2016.
  2. Anthracen-9-yl)methyl sulfides as a mechanistic probe for chemical as well as photochemical electron-transfer reactions, Reshma Gopalakrishnan, Jomon P. Jacob, Sa ada Farhana T. Moideen, Ligi M. Lalu, Perupparampil A. Unnikrishnan, and Sreedharan Prathapan*., ARKIVOC, 2015.
  3. Ground and excited-state electron-transfer reactions of a few (anthracen-9-yl)methanamines: A comparative study, Jomon P. Jacob, Ligi M. Lalu, Reshma Gopalakrishnan, Rekha R. Mallia, Perupparampil A. Unnikrishnan, and Sreedharan Prathapan*., ARKIVOC, 2015
  4. A New Method for the Synthesis of 3-Substituted Indoles, Rakesh Natarajan · John P. Rappai · Peruparampil A. Unnikrishnan · Sandhya Radhamani · Sreedharan Prathapan, synlett., 2015.
  5. Diverse reactivity of nitrones towards electron deficient acetylenes, Radhamani, S; Natarajan, R; Unnikrishnan, P. A., Prathapan, S. and Rappai, J. P., New. J. Chem., 2015.
  6. Efficient one-pot synthesis of (anthracen-9-yl)methyl sulfane derivatives, Gopalakrishnan, R;Jacob, J. P.; Chirakkandathil, R.; Unnikrishnan, P. A. and Prathapan, S., Cogent Chemistry, 2015.
  7. Solvent effects in the reaction between (anthracen-9-yl)methyl sulfides and electron deficient Acetylenes, Gopalakrishnan, R; Jacob, J. P.; Mallia, R. R.; Unnikrishnan, P. A. and Prathapan, S., J. Phys. Org. Chem. 2015.
  8. Facile one-pot method for the synthesis of arylmethanamines, J. P. Jacob, L. M. Lalu, R. Gopalakrishnan, R. R. Mallia, S. Prathapan, P. A. Unnikrishnan, J. Adv. Res. App. Che. & Che. Eng. 2014.
  9. Domino reaction sequences leading to the formation of 2:2 adducts between acenaphthenequinone and acetophenone , J. P. Jacob, C. Kunjachan, L. U. Sajitha, R. K. Thumpakara, K. Rakesh, V. Nidhisha, P. A. Unnikrishnan and S. Prathapan, ARKIVOC 2014, 6, 127-138
  10. Dramatic solvent and concentration dependence in the reaction of (anthracen-9-yl)methanamines with suitable electron-deficient acetylenes, J. Jacob, R. Gopalakrishnan, R. R. Mallia, J. J. Vadakkan, P. A. Unnikrishnan a nd S. Prathapan, J. Phys. Org. Chem. 2014, 27 884–891
  11. Novel Burgess reagent mediated C-to-N aryl migration reaction in nitrones, T. S. Sajitha, S. Prathapan and P. A. Unnikrishnan, RSC Adv., 2014, 4, 44689–44691.
  12. 8-Phenyl-16-thiapentacyclo [ 1,18 .0 2,7 .0 9,14 ]nonadeca- 2,4,6,9,11,13,18-heptaene, E. M. Mathew, M. Sithambaresan, P. A. Unnikrishnan and M. R. Prathapachandra Kurup, Acta Cryst. 2013, E69, o1165
  13. A simple and efficient one-pot synthesis of nitriles from amides and oximes using in situ generated Burgess-type reagent, Rappai, J. P.; Karthikeyan, J.; Prathapan, S.; Unnikrishnan, P. A. Synth. Commun. 2011, 41, 2601.
  14. Effect of a Strategically Positioned Methoxy Substituent on the Photochemistry of 3-Aryl-3H-1-Oxacyclopenta[l]Phenanthren-2-ones, Thumpakara, R. K.; Jose, B.; Unnikrishna, P. A.; Prathapan, S.; Rath, N. P. Org. Chem. Int. 2010. (doi:10.1155/2010/764185)
  15. Preliminary investigations on the synthesis and antitumor activity of 3(2H)-furanones, Rappai, J. P.; Raman, V.; Unnikrishna, P. A.; Prathapan, S.; Thomas, S. K.; Paulose, C. S. Bioorg. Med. Chem.Lett. 2009, 19, 764.
  16. Simple, Efficient, and Stereoselective Oxidation of Triphenylfurans to cis-But-2-ene-1,4-diones, Rappai, J. P.; Prathapan, S.; Vishnu Unni, M. V.; Unnikrishnan, P. A. Synth.Commun. 2007, 37, 569.
  17. A novel electron transfer mediated reaction leading to lepidopterene, Vadakkan, J. J.; Mallia, R. R.; Prathapan, S.; Rath, N. P.; Unnikrishnan, P. A. Tetrahedron Lett. 2005, 46, 5919.