Search

Your search keyword '"Armantrout, John R."' showing total 8 results
Start Over Author "Armantrout, John R."
8 results on '"Armantrout, John R."'

1. Diatropicity of 3,4,7,8,9,10,13,14-octadehydro[14]annulenes: a combined experimental and theoretical investigation

Author

Boydston, Andrew J., Haley, Michael M., Williams, Richard Vaughan, and Armantrout, John R.

Subjects
Chemistry, Organic -- Research, Ring formation (Chemistry) -- Research, Biological sciences, Chemistry
Abstract

Research has been conducted on octadehydro[14]annulenes. The study and synthesis of these compounds have been carried out and their aromaticity has been investigated via the analysis of experimental data from arene-fused systems.

Published
2002

2. Dimethyldihydropyrene-dehydrobenzoannulene hybrids: studies in aromaticity and photoisomerization

Author

Kimball, David B., Haley, Michael M., Mitchell, Reginald H., Ward, Timothy R., Bandyopadhyay, Subhajit, Williams, Richard Vaughan, and Armantrout, John R.

Subjects
Chemistry, Organic -- Research, Photochemistry -- Research, Aromatic compounds, Isomerization -- Analysis, Biological sciences, Chemistry
Abstract

Research has been conducted on dimethyldihydropyrene-dehydrobenzoannulene hybrids. The study and synthesis of these hybrids have been carried out in investigating aromaticity in weakly diatropic systems and the details are reported.

Published
2002

3. N,N-difluorotris(tert-butyl)silylamine- the first organosilyl difluoroamine. Synthesis and computational studies

Author

Majumder, Utpal, Armantrout, John R., Williams, Richard Vaughan, and Shreeve, Jean'ne M.

Subjects
Chemistry, Organic -- Research, Nitrogen compounds, Amines, Fluorine compounds, Silane, Biological sciences, Chemistry
Abstract

Research has been conducted on the stable trialkyl(difluoroamino)silane. The synthesis and characterization of this compound have been performed and the use of (difluoroamino)silane as a synthon for introduction of -NF (sub)2 group into electrophilic organic and inorganic substrates is discussed.

Published
2002

4. A theoretical and experimental scale of aromaticity. The first nucleus-independent chemical shifts (NICS) study of the dimethyldihydropyrene nucleus

Author

Williams, Richard Vaughan, Armantrout, John R., Twamley, Brendan, Mitchell, Reginald H., Ward, Timothy R., and Bandyopadhyay, Subhajit

Subjects
Aromatic compounds -- Research, Methyl groups -- Chemical properties, Chemical research -- Analysis, Chemistry
Abstract

Calculation of nucleus-independent chemical shift (NICS) values was done at several locations for a series of dimethyldihydropyrenes (DDPs). The NICS and experimentally determined relative aromaticities of the dimethyldihydropyrenes are in complete agreement, verifying that NICS can be used not only to classify a compound as aromatic but also to determine the degrees of aromaticity of structurally related systems.

Published
2002

5. Experimental and theoretical study of stabilization of delocalized forms of semibullvalenes and barbaralanes by dipolar and polarizable solvents. Observation of a delocalized structure that is lower in free energy than the localized form

Author

Seefelder, Maximilian, Heubes, Markus, Quast, Helmut, Edwards, W. Daniel, Armantrout, John R., Williams, Vaughan Richard, Cramer, Christopher J., Goren, Alan C., Hrovat, David A., and Borden, Weston Thatcher

Subjects
Thermochromism -- Research, Magnetic dipoles -- Chemical properties, Magnetic dipoles -- Research, Biological sciences, Chemistry
Abstract

UV/vis spectra of thermochromic semibullvalenes and barbaralanes, which undergo rapid degenerate Cope rearrangements, display temperature-dependent shoulders or absorption maxima at the low-energy side of their strong UV bands. The long-wavelength absorptions are ascribed to Franck-Condon transitions from delocalized structures.

Published
2005

Catalog

Books, media, physical & digital resources
See catalog results