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Your search keyword '"Raj Kumar Raheja"' showing total 5 results
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5 results on '"Raj Kumar Raheja"'

1. Ozonolysis of Allenes and Alkylidenecyclopropanes (Homoallenes)

Author

Kurt Schank, Raj Kumar Raheja, Richard Francis Langler, and Horst P. Beck

Subjects
Ozonolysis, Ozone, Chemistry, Organic Chemistry, Ether, Photochemistry, Biochemistry, Catalysis, Cyclopropane, Inorganic Chemistry, chemistry.chemical_compound, Computational chemistry, Drug Discovery, Physical and Theoretical Chemistry, Oxygen mixture
Abstract

Allenyl methyl ether (1) and (diphenylmethylene)cyclopropane (5) were ozonized with an ozone/oxygen mixture. Formation of the observed products cannot be satisfactorily rationalized via the familiar modified Criegee mechanism. However, a single-electron transfer (SET) mechanism provides a simple rationale.

Published
2001
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4. A MNDO study of planar thioacyl-substituted carbocations

Author

Jack Leon Ginsburg, Laura Precedo, Raj Kumar Raheja, and Richard Francis Langler

Subjects
education.field_of_study, Isodesmic reaction, Stereochemistry, Chemistry, Organic Chemistry, Population, Substituent, MNDO, General Chemistry, Carbocation, Catalysis, Ion, chemistry.chemical_compound, Carbonium ion, Computational chemistry, education, Saturation (chemistry)
Abstract

Relative gas phase stabilities of pairs of planar regioisomeric thioacyl-substituted carbocations have been calculated using the MNDO method. These systems are stabilized by good π donors. The role of S π-electron population as a gauge of substituent effects is examined. Similar results were obtained using isodesmic reactions to gauge substituent effects. Results of this and earlier studies are consistent with the resonance saturation effect. Keywords: semiempirical calculations, carbonium ions.

Published
1992
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5. Sulfonyl esters. 2. CS cleavage in some substitution reactions of nitrobenzenesulfonates

Author

Richard Francis Langler, Raj Kumar Raheja, Paul Joseph Pujol, Jimat Bolhassan, and James Clayton Baum

Subjects
chemistry.chemical_classification, Substitution reaction, Sulfonyl, Ethanol, Organic Chemistry, Nitro compound, General Chemistry, Electrophilic aromatic substitution, Cleavage (embryo), Medicinal chemistry, Catalysis, chemistry.chemical_compound, Sulfonate, chemistry, Nucleophilic substitution
Abstract

An attempt to explore aromatic sulfonate esters as agents for the condensation of alcohols with mercaptans revealed an unusual process for sulfonate esters: CS bond rupture. Two mechanistic possibilities for CS bond rupture are explored: (i) radical anion intermediacy via single electron transfer and (ii) nucleophilic aromatic substitution. Both experiments and molecular orbital computations are presented to support the conclusion that nucleophilic aromatic substitutions are occurring. Keywords: sulfonyl esters, nitrobenzenesulfonates, CS bond rupture.

Published
1990
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