Ronald Callahan

G.R Underwood and R.J. Callahan, “The Solvolysis of N-Acetoxy-acetanilides: Definition of Two Competing Processes” J. Chem Soc., Chem Commun, 5427-5430 (1987)

R. Callahan, R, Rothchild, and H. Wyss, “NMR Studies of Hindered Rotation of the Diels-Alder Adduct of Phencyclone With P-benzoquinone; Restricted Motion of the Bridgehead Phenyls” Spectroscopic Letters, vol. 26, no. 9, 1681-1693 (1993)

R. Benshafrut, R. Callahan, and R. Rothchild, “ The Diels-Alder Adduct of Phencyclone With Maleic Anhydride. Restricted Motion of the Bridgehead Phenyls” Spectroscopy Letters, vol. 26, no.10, 1875-1888 (1993)

R. Callahan, K Bynum, and R. Rothchild, “Synthesis of Diels-Alder Adducts of Phencyclone and NMR studies of Hindered Rotations of Unsubstituted Bridgehead Phenyls: Microscale Experiments in Organic Chemistry” presented to the US Education Department Minority Science Improvement Program annual project directors meeting, Washington, DC Nov 14-16, 1996.

K.Bynum, R. Callahan, M. Amin and R. Rothchild, “ 1H, 13C, and 19F NMR Studies of Hindered Rotation in the Diels-Alder adduct of Phencyclone with N-pentafluorophenyl Maleimide. Presentation to the Eastern Analytical Symposium, Montchanin, DE 11/17/97

F. Amin, K. Bynum, R. Callahan, R. Prip, and R. Rothchild, “Studies of Hindered Rotation and Magnetic Anisotropy By 1H, 13C, and 19F NMR. The Diels Alder Adduct of N-Pentafluorophenylmaleimide and Phencyclone: A Model for Drugs” Spectroscopy Letters, vol. 31 no. 3, 673-692 (1998)

G. Boccia, R. Callahan, R. Prip, and R. Rothchild, “Studies of Hindered Rotation and Magnetic Anisotropy By 1H, 19F, and 13C NMR In Models for Drugs. I. The Diels-Alder Adduct of Phencyclone with N-2,2,2-Trifluoroethylmaleimide, and Precursors” Spectroscopy Letters, vol. 31 no. 7, 1367-1378 (1998)

R. Callahan, K. Bynum, R. Prip, and R. Rothchild, “Synthesis of Diels-Alder Adducts of Phencyclone and NMR Studies of Hindered Rotations of Unsubstituted Bridgehead Phenyls: Microscale Experiments in Organic Chemistry.” Chem Educator 3(2): S1430-4171(98) 02192-4. (1998) Avail. URL: http//journals.springer-ny.com/chedr.

K. Bynum, R. Prip, R. Callahan, R. Rothchild, “19F NMR Studies of the Diels-Alder Adduct of N-pentafluorophenylmaleimide with Phencyclone. Hindered Rotation About A N-C6F5 Bond”. Journal of Fluorine Chemistry 90, 39-46, (1998)

Callahan, R.,Kobilinsky, L., Rothchild, R., “Organic chemistry course development in a forensic science program: Use of FT-NMR”. J. Chem. Educ. 1999, 76(10), 1132-1133

N. Azaryayev, R. Rothchild, R. Callahan, “Multinuclear NMR Studies of Hindered Rotations in Phencyclone Diels-Alder Adducts with Maleimides” Presentation to the Eastern Analytical Symposium & Exposition, Somerset, New Jersey. 11/14/99

O. Sklyut, R. Rothchild, R. Callahan, “Hindered Rotation in a Diels-Alder of Phencyclone with N-2,3,5,6-Tetrafluorophenylmaleimide” Presentation to the Eastern Analytical Symposium & Exposition, Somerset, New Jersey. 11/14/99.
Callahan, R.; Marshall, K.; Rothchild, R.; Rosmarion, K. “Syntheses of Phencyclone Analogues. Applications for NMR Studies of Hindered Rotations and Magnetic Anisotropy in Crowded Diels-Alder Adducts” Chem. Educator [Online] 2001, 6, 227234; DOI 10 1007/s00897010488a.

Olga Sklyut, Ron Prip, Nikolay Azar, Ronald Callahan, and Robert Rothchild “Proton and Carbon-13 NMR Studies of the Phencyclone Adducts of Medium Alkyl Chain-length N-n-Alkyl-maleimides. Hindered Rotations and Magnetic Anisotropic Effects. AB Initio Calculations For Optimized Structures” Spectroscopy Letters, vol. 37 no. 5, 493-516 (2004)

Kimberly Marshall, Kerstin Rosmarion, Olga Sklyut, Nikolay Azar, Ronald Callahan, Robert Rothchild. “ 1H, 13C, 19F NMR Studies of Phencyclone Adducts of N-(Polyhalo)Phenylmaleimides. Dynamic NMR In Maleamic Acids. Ab Initio Calculations For Optimized Structures” Journal of Fluorine Chemistry 125 (2004) 1893-1907

Ronald Callahan, Orlando Ramirez, Kerstin Rosmarion, Robert Rothchild, Kevin C. Bynum
“Multinuclear NMR Studies and AB Initio Structure Calculations of Hindered Phencyclone Diels-Alder Adducts From Symmetrical Cyclic Dienophiles: Cyclohexene, Vinylene carbonate, Vinylene Trithiocarbonate, and two N-ArylMaleimides” J. Heterocyclic Chem., 42, 889-898 (2005).

Ronald Callahan, Ron Prip, Navroz Shariff, Olga Sklyut, Robert Rothchild, Kevin Bynum
“1H and 13C Nuclear Magnetic Resonance Studies of the Hindered Phencyclone Adducts of Some Smaller Branched N-Alkyl Maleimides: Rigorous Aryl Proton Assignments with High-Resolution Two-Dimensional (COSY45) Spectroscopy, and Anisotropic Shielding Effects and Ab Initio Geometry Optimizations Applied Science volume 59, number 3, 354-365, (2005)