Publications by authors named "Helmut Quast"

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Calculations of the relative energies of the low-lying electronic states of 2-methylenedihydrophenalene-1,3-diyl: effects of a 1,8-naphtho bridging group on trimethylenemethane and of a vinylidene bridging group on 1,8-naphthoquinodimethane.
Hao Dong, David A Hrovat, Helmut Quast, Weston Thatcher Borden

J Phys Chem A· February 2009

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A perimidine-derived non-Kekulé triplet diradical.
Helmut Quast, Wolfgang Nüdling, Gerhard Klemm, Andreas Kirschfeld, Patrik Neuhaus

J Org Chem· July 2008

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Iminodiaziridines by regio- and stereoselective cyclization of diastereomeric singlet triazatrimethylenemethane diradicals generated through photolysis of 5-imino-4,5-dihydro-1H-tetrazoles.
Helmut Quast, Lothar W Bieber

J Org Chem· May 2008

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Synthesis, configuration, and (15)n NMR spectra of iminoaziridines. Synthons equivalent to three components of the Ugi reaction.
Helmut Quast, Sven Aldenkortt, Bernd Freudenreich, Peter Schäfer, Manfred Hagedorn

J Org Chem· March 2007

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How important is bishomoaromatic stabilization in determining the relative barrier heights for the degenerate Cope rearrangements of semibullvalene, barbaralane, bullvalene, and dihydrobullvalene?
David A Hrovat, Eric C Brown, Richard Vaughan Williams, Helmut Quast, Weston Thatcher Borden

J Org Chem· April 2005

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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.
Maximilian Seefelder, Markus Heubes, Helmut Quast, W Daniel Edwards, John R Armantrout

J Org Chem· April 2005

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The search for bishomoaromatic semibullvalenes and barbaralanes: computational evidence of their identification by UV/Vis and IR spectroscopy and prediction of the existence of a blue bishomoaromatic semibullvalene.
Alan C Goren, David A Hrovat, Maximilian Seefelder, Helmut Quast, Weston Thatcher Borden

J Am Chem Soc· April 2002

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