Helmut Quast - Search Results

Year	Number of Results
2002	1
2005	2
2007	1
2008	2
2009	1
2024	0

1

A perimidine-derived non-Kekulé triplet diradical.

Quast H, Nüdling W, Klemm G, Kirschfeld A, Neuhaus P, Sander W, Hrovat DA, Borden WT. Quast H, et al. J Org Chem. 2008 Jul 4;73(13):4956-61. doi: 10.1021/jo800589y. Epub 2008 Jun 12. J Org Chem. 2008. PMID: 18547111

2

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.

Seefelder M, Heubes M, Quast H, Edwards WD, Armantrout JR, Williams RV, Cramer CJ, Goren AC, Hrovat DA, Borden WT. Seefelder M, et al. Among authors: quast h. J Org Chem. 2005 Apr 29;70(9):3437-49. doi: 10.1021/jo0502089. J Org Chem. 2005. PMID: 15844976

3

How important is bishomoaromatic stabilization in determining the relative barrier heights for the degenerate Cope rearrangements of semibullvalene, barbaralane, bullvalene, and dihydrobullvalene?

Hrovat DA, Brown EC, Williams RV, Quast H, Borden WT. Hrovat DA, et al. Among authors: quast h. J Org Chem. 2005 Apr 1;70(7):2627-32. doi: 10.1021/jo048268m. J Org Chem. 2005. PMID: 15787553

4

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.

Goren AC, Hrovat DA, Seefelder M, Quast H, Borden WT. Goren AC, et al. Among authors: quast h. J Am Chem Soc. 2002 Apr 3;124(13):3469-72. doi: 10.1021/ja0122290. J Am Chem Soc. 2002. PMID: 11916433

5

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.

Dong H, Hrovat DA, Quast H, Borden WT. Dong H, et al. Among authors: quast h. J Phys Chem A. 2009 Feb 5;113(5):895-901. doi: 10.1021/jp809715v. J Phys Chem A. 2009. PMID: 19140715

6

Synthesis, configuration, and (15)n NMR spectra of iminoaziridines. Synthons equivalent to three components of the Ugi reaction.

Quast H, Aldenkortt S, Freudenreich B, Schäfer P, Hagedorn M, Lehmann J, Banert K. Quast H, et al. J Org Chem. 2007 Mar 2;72(5):1659-66. doi: 10.1021/jo062213y. Epub 2007 Jan 27. J Org Chem. 2007. PMID: 17256991

7

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

Quast H, Bieber LW. Quast H, et al. J Org Chem. 2008 May 16;73(10):3738-44. doi: 10.1021/jo702697f. Epub 2008 Apr 17. J Org Chem. 2008. PMID: 18416576

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