All Stories

  1. Folded conformations (U-motif) due to arene interactions both in solution and solid.

    Article • Acta Crystallographica Section C Structural Chemistry, May 2014, International Union of Crystallography

    kamlakar avasthi

  2. Better understanding of arene interactions for control of conformation.

    Article • ChemInform, May 2013, Wiley

    kamlakar avasthi

  3. First examples of syn-conformation in solid state in 1,2-diarylethanes.

    Article • CrystEngComm, January 2012, Royal Society of Chemistry

    kamlakar avasthi

  4. An alternative to ‘propylene/Leonard linker’ for folding.

    Article • CrystEngComm, January 2011, Royal Society of Chemistry

    kamlakar avasthi

  5. ChemInform Abstract: A (3.1.0)-Fused 2′,3′-Modified β-D-Pyrazolo(3,4-d)pyrimidine Nucleoside.

    Article • ChemInform, August 2010, Wiley

    kamlakar avasthi

  6. Pyrazolo[3,4-d]pyrimidinophanes: Convenient Synthesis of a New Class of Cyclophane and X-ray Structure of the First Representative

    Article • Organic Letters, October 2009, American Chemical Society (ACS)

    kamlakar avasthi

  7. Studies on arene interactions in flexible pyrazolo[3,4-d]pyrimidine core based symmetrical ‘propylene/Leonard linker’ models: X-ray crystallographic evidence for disappearance of intramolecular stacking due to presence of chloro- or cyano-groups in pla...

    Article • Journal of Molecular Structure, June 2009, Elsevier

    kamlakar avasthi

  8. Unusual effect of bulky isopropyl group on robustness of the U-motif in pyrazolo[3,4-d]pyrimidine core based ‘Leonard linker’ compounds in comparison to methyl/ethyl group: A1H NMR and X-ray crystallographic study

    Article • Journal of Molecular Structure, October 2008, Elsevier

    kamlakar avasthi

  9. Design and synthesis of pyrazolo[3,4-d]pyrimidine and triazolo[4,5-d]pyrimidine based dissymmetrical ‘Leonard linker’ compounds: 1H NMR and crystallographic evidence for folded conformation due to arene interactions

    Article • Journal of Molecular Structure, October 2007, Elsevier

    kamlakar avasthi, Dr Ashish Kumar Tewari Kumar Tewari

  10. 1H NMR and crystallographic evidence for tolerance of bulky electron withdrawing methanesulfonyl group on robustness of the U-motif in pyrazolo[3,4-d]pyrimidine core based ‘Leonard linker’ compounds and formation of plus (+) motif

    Article • Journal of Molecular Structure, February 2007, Elsevier

    kamlakar avasthi

  11. Design and synthesis of pyrazolo[3,4-d]pyrimidine core based dissymmetrical ‘Leonard linker’ compounds: 1H NMR and crystallographic evidence for folded conformation due to arene interactions

    Article • Journal of Molecular Structure, March 2006, Elsevier

    kamlakar avasthi

  12. Fine tuning of folded conformation by change of substituents: 1H NMR and crystallographic evidence for folded conformation due to arene interactions in pyrazolo[3,4-d]pyrimidine core based ‘propylene linker’ compounds

    Article • Journal of Molecular Structure, August 2005, Elsevier

    kamlakar avasthi

  13. A stacked pyrazolo[3,4-d]pyrimidine-based flexible molecule: the effect on stacking of a bulky isopropyl group in comparison with a methyl/ethyl group

    Article • Acta Crystallographica Section C Crystal Structure Communications, August 2003, International Union of Crystallography

    kamlakar avasthi

  14. 4,6-Bis(methylsulfanyl)-1-(4-phenoxybutyl)-1H-pyrazolo[3,4-d]pyrimidine

    Article • Acta Crystallographica Section C Crystal Structure Communications, August 2003, International Union of Crystallography

    kamlakar avasthi

  15. Unusual molecular conformation in dissymmetric propylene-linker compounds containing pyrazolo[3,4-d]pyrimidine and phthalimide moieties

    Article • Acta Crystallographica Section C Crystal Structure Communications, July 2003, International Union of Crystallography

    kamlakar avasthi

  16. Intermolecular stacking in pyrazolo[3,4-d]pyrimidine-based pentamethylene-linked flexible molecules

    Article • Acta Crystallographica Section C Crystal Structure Communications, December 2002, International Union of Crystallography

    kamlakar avasthi

  17. Disappearance of inter- and intramolecular stacking due to one-atom addition in `propylene-linker' in a pyrazolo[3,4-d]pyrimidine-based flexible molecule

    Article • Acta Crystallographica Section E Structure Reports Online, July 2002, International Union of Crystallography

    kamlakar avasthi

  18. A stacked pyrazolo[3,4-d]pyrimidine-based flexible molecule: the effect of a bulky benzyl group on intermolecular stacking in comparison with methyl and ethyl groups

    Article • Acta Crystallographica Section C Crystal Structure Communications, July 2002, International Union of Crystallography

    kamlakar avasthi

  19. A dimeric layered structure of a 4-oxo-4,5-dihydro-1H-pyrazolo[3,4-d]pyrimidine compound

    Article • Acta Crystallographica Section C Crystal Structure Communications, May 2002, International Union of Crystallography

    kamlakar avasthi

  20. Isomeric pyrazolo[3,4-d]pyrimidine-based molecules: disappearance of dimerization due to interchanged substitutions

    Article • Acta Crystallographica Section C Crystal Structure Communications, May 2002, International Union of Crystallography

    kamlakar avasthi

  21. A stacked pyrazolo[3,4-d]pyrimidine-based flexible molecule: the effect on stacking of an ethyl group in comparison with a methyl group

    Article • Acta Crystallographica Section C Crystal Structure Communications, November 2001, International Union of Crystallography

    kamlakar avasthi

  22. 1,3-Bis(8-chlorotheophyllin-7-yl)propane: a molecule with no intramolecular stacking

    Article • Acta Crystallographica Section E Structure Reports Online, November 2001, International Union of Crystallography

    kamlakar avasthi

  23. 1H NMR and X-ray crystallographic analysis of 1,2-bis(4,6-diethylthio-1H-pyrazolo[3,4-d]pyrimidin-1-yl)ethane and its ‘propylene linker’-analog: molecular recognition versus crystal engineering

    Article • Tetrahedron Letters, October 2001, Elsevier

    kamlakar avasthi

  24. Disappearance of intramolecular stacking due to one-atom movement or increment of a `propylene linker' in pyrazolo[3,4-d]pyrimidine-based flexible models

    Article • Acta Crystallographica Section C Crystal Structure Communications, November 2000, International Union of Crystallography

    kamlakar avasthi

  25. Another example of folded conformation compound based on pyrazolo[3,4-d]pyrimidine system.

    Article • Acta Crystallographica Section C Crystal Structure Communications, February 1998, International Union of Crystallography

    kamlakar avasthi

  26. A [3.1.0]-Fused 2',3'-Modified β-D-Pyrazolo[3,4-d]pyrimidine Nucleoside

    Article • Acta Crystallographica Section C Crystal Structure Communications, October 1996, International Union of Crystallography

    kamlakar avasthi

  27. The first example of a folded compound due to intramolecular arene interaction in the solid state.

    Article • Acta Crystallographica Section C Crystal Structure Communications, November 1995, International Union of Crystallography

    kamlakar avasthi

  28. ChemInform Abstract: Marine Nucleosides ‐ A Review

    Article • ChemInform, June 1994, Wiley

    kamlakar avasthi

  29. Prostaglandin endoperoxides. 25. Levuglandin E2: enantiocontrolled total synthesis of a biologically active rearrangement product from the prostaglandin endoperoxide PGH2

    Article • The Journal of Organic Chemistry, May 1990, American Chemical Society (ACS)

    kamlakar avasthi

  30. Regioselective Alkylation of 4,6-Bis(methylthio)-1 H -pyrazolo[3,4- d ]pyrimidine

    Article • Synthesis, January 1989, Thieme Publishing Group

    kamlakar avasthi

  31. Copper(I) catalysis of olefin photoreactions. 14. A copper(I)-catalyzed photobicyclization route to exo-1,2-polymethylene- and 7-hydroxynorbornanes. Nonclassical 2-bicyclo[3.2.0]heptyl and 7-norbornyl carbenium ion intermediates

    Article • The Journal of Organic Chemistry, June 1986, American Chemical Society (ACS)

    kamlakar avasthi

  32. Prostaglandin endoperoxides. 15. Asymmetric total synthesis of levuglandin E2

    Article • Journal of the American Chemical Society, December 1984, American Chemical Society (ACS)

    kamlakar avasthi

  33. Copper(I) catalysis of olefin photoreactions. 13. Synthesis of bicyclic vinylcyclobutanes via copper(I)-catalyzed intramolecular 2.pi. + 2.pi. photocycloadditions of conjugated dienes to alkenes

    Article • The Journal of Organic Chemistry, November 1984, American Chemical Society (ACS)

    kamlakar avasthi

  34. The Reaction of Organoboranes with Lithium Salts of Trisylhydrazones of Cycloalkanones Followed by Treatment with Iodine

    Article • Bulletin of the Chemical Society of Japan, May 1983, The Chemical Society of Japan

    kamlakar avasthi

  35. Chemistry of 1,6‐diazaphenalene. Reaction with alkylating and acylating agents

    Article • Journal of Heterocyclic Chemistry, November 1982, Wiley

    kamlakar avasthi

  36. Synthesis and reactions of 1‐[1‐oxido‐2‐(3,4)‐pyridinyl]‐2‐methyloxiranes with nitrogen nucleophiles

    Article • Journal of Heterocyclic Chemistry, March 1981, Wiley

    kamlakar avasthi

  37. The Chemistry of 1,6-Diazaphenalene. Electrophilic Substitution and Reaction with Singlet Oxygen

    Article • Heterocycles, January 1981, Japan Institute of Heterocyclic Chemistry

    kamlakar avasthi

  38. Diels–Alder cycloadditions of N-substituted-1,2-dihydropyridines with nitrosobenzene. Synthesis of 3-phenyl-2-oxa-3,6-diazabicyclo[2.2.2]oct-7-enes

    Article • Canadian Journal of Chemistry, December 1980, Canadian Science Publishing

    kamlakar avasthi

  39. Synthesis and reactions of 1-hydroxy-1-(pyridinyl)-2-propanones

    Article • Canadian Journal of Chemistry, January 1980, Canadian Science Publishing

    kamlakar avasthi

  40. The reaction of iodine with vinyltrialkylborates derived from trialkylboranes and trisylhydrazones of methyl ketones. A new method for synthesis of 1,1-dialkylethenes

    Article • Tetrahedron Letters, January 1980, Elsevier

    kamlakar avasthi

  41. Reactions of 1,2-diorganoboranes with airline silver nitrate - a new route to olefins

    Article • Tetrahedron Letters, December 1976, Elsevier

    kamlakar avasthi