All Outputs (7)

Carbanion reactivity, kinetic and equilibrium studies of σ-adduct formation and elimination in the reactions of 4-nitrobenzofurazan derivatives with nitroalkane anions (2007)
Journal Article
Asghar, B., & Crampton, M. (2007). Carbanion reactivity, kinetic and equilibrium studies of σ-adduct formation and elimination in the reactions of 4-nitrobenzofurazan derivatives with nitroalkane anions. Organic and Biomolecular Chemistry, 5(10), 1646-1654. https://doi.org/10.1039/b703154h

1H NMR studies are reported of the reactions in [2H6]-DMSO of 4-nitrobenzofurazan, 2a, and its 7-chloro- and 7-methoxy-derivatives, 2b and 2c respectively, with anions derived from nitromethane, 3, nitroethane, 4, and 2-nitropropane, 5. The initial r... Read More about Carbanion reactivity, kinetic and equilibrium studies of σ-adduct formation and elimination in the reactions of 4-nitrobenzofurazan derivatives with nitroalkane anions.

Catalytic, asymmetric Strecker reactions catalysed by titanium(IV) and vanadium(V)(salen) complexes. (2006)
Journal Article
Blacker, J., Clutterbuck, L., Crampton, M., Grosjean, C., & North, M. (2006). Catalytic, asymmetric Strecker reactions catalysed by titanium(IV) and vanadium(V)(salen) complexes. Tetrahedron: Asymmetry, 17(9), 1449-1456. https://doi.org/10.1016/j.tetasy.2006.05.015

VanadiumV(salen) complex 3 has been found to be an effective catalyst for the asymmetric addition of hydrogen cyanide (generated in situ from trimethylsilyl cyanide) to imines. The best results (up to 81% enantiomeric excess) were obtained for aromat... Read More about Catalytic, asymmetric Strecker reactions catalysed by titanium(IV) and vanadium(V)(salen) complexes..

Effects of ortho- and para-ring activation on the kinetics of S_NAr reactions of 1-chloro-2-nitro and 1-phenoxy-2-nitrobenzenes with aliphatic amines in acetonitrile (2005)
Journal Article
Crampton, M., Emokpae, T., Isanbor, C., Batsanov, A., Howard, J., & Mondal, R. (2006). Effects of ortho- and para-ring activation on the kinetics of SNAr reactions of 1-chloro-2-nitro and 1-phenoxy-2-nitrobenzenes with aliphatic amines in acetonitrile. European Journal of Organic Chemistry, 2006(5), 1222-1230. https://doi.org/10.1002/ejoc.200500774

Rate constants are reported for reaction of 4-substituted 1-chloro-2,6-dinitrobenzenes 1, 6-substituted 1-chloro-2,4-dinitrobenzenes 2, and some of the corresponding 1-phenoxy derivatives, 3 and 4, with n-butylamine, pyrrolidine and piperidine in ace... Read More about Effects of ortho- and para-ring activation on the kinetics of S_NAr reactions of 1-chloro-2-nitro and 1-phenoxy-2-nitrobenzenes with aliphatic amines in acetonitrile.

Electronic and steric effects in the SNAr substitution reactions of substituted anilines with 2,4-dinitrophenyl 2,4,6-trinitrophenyl ether in acetonitrile (2005)
Journal Article
Crampton, M. R., Emokpae, T. A., & Isanbor, C. (2006). Electronic and steric effects in the SNAr substitution reactions of substituted anilines with 2,4-dinitrophenyl 2,4,6-trinitrophenyl ether in acetonitrile. Journal of Physical Organic Chemistry, 19(1), 75-80. https://doi.org/10.1002/poc.997

Rate measurements are reported for the reactions of 12 ring-substituted anilines with 2,4-dinitrophenyl 2,4,6-trinitrophenyl ether (1) in acetonitrile. Formation of the products, the correspondingly substituted 2,4,6-trinitrodiphenylamines, occurs wi... Read More about Electronic and steric effects in the SNAr substitution reactions of substituted anilines with 2,4-dinitrophenyl 2,4,6-trinitrophenyl ether in acetonitrile.

Rate-limiting proton-transfer in the σ-adduct forming reactions of 1,3,5-trinitrobenzene and 4-nitrobenzofuroxan with substituted anilines in dimethyl sulfoxide (2005)
Journal Article
Asghar, B., & Crampton, M. (2005). Rate-limiting proton-transfer in the σ-adduct forming reactions of 1,3,5-trinitrobenzene and 4-nitrobenzofuroxan with substituted anilines in dimethyl sulfoxide. Organic and Biomolecular Chemistry, 3(21), 3971-3978. https://doi.org/10.1039/b511644a

Kinetic and equilibrium results are compared for the reactions in dimethyl sulfoxide of 1,3,5-trinitrobenzene, 1, and 4-nitrobenzofuroxan, 4, with a series of substituted anilines in the presence of Dabco or in, some cases, quinuclidine. pKa values f... Read More about Rate-limiting proton-transfer in the σ-adduct forming reactions of 1,3,5-trinitrobenzene and 4-nitrobenzofuroxan with substituted anilines in dimethyl sulfoxide.

The Strecker reaction: kinetic and equilibrium studies of cyanide addition to iminium ions (2004)
Journal Article
Atherton, J., Blacker, J., Crampton, M., & Grosjean, C. (2004). The Strecker reaction: kinetic and equilibrium studies of cyanide addition to iminium ions. Organic and Biomolecular Chemistry, 2(18), 2567-2571. https://doi.org/10.1039/b407853e

Kinetics studies are reported of the reactions of benzylidene benzylamine, 4a, and of benzylidene allylamine, 4b, with cyanide in aqueous buffers to give the corresponding a-aminonitriles. The results allow the calculation of values of rate and equil... Read More about The Strecker reaction: kinetic and equilibrium studies of cyanide addition to iminium ions.

sigma-adduct formation and oxidative substitution in the reactions of 4-nitrobenzofurazan and some derivatives with hydroxide ions in water (2003)
Journal Article
Crampton, M., Lunn, R., & Lucas, D. (2003). sigma-adduct formation and oxidative substitution in the reactions of 4-nitrobenzofurazan and some derivatives with hydroxide ions in water. Organic and Biomolecular Chemistry, 1(19), 3438-3443. https://doi.org/10.1039/b307648m

The reactions of hydroxide ions with 4-nitrobenzofurazan, 1a, 4-nitrobenzofuroxan, 1b, and with three 4-nitro-7-substituted benzofurazans have been examined using H-1 NMR and UV-visible spectroscopies. In each case initial reaction is at the 5-positi... Read More about sigma-adduct formation and oxidative substitution in the reactions of 4-nitrobenzofurazan and some derivatives with hydroxide ions in water.