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Featured researches published by Steffen Berg.


Journal of Inorganic Biochemistry | 2015

Improved syntheses of β-octabromo-meso-triarylcorrole derivatives.

Jan Capar; Steffen Berg; Kolle E. Thomas; Christine M. Beavers; Kevin J. Gagnon; Abhik Ghosh

In spite of significant applications as starting materials for a variety of metallocorrole derivatives, free-base β-octabromo-meso-triarylcorroles continue to be viewed as inaccessible. The reasons range from the need for tedious column-chromatographic purification to limitations of the reductive demetallation protocol for selected systems. Here we report that column chromatography may be entirely avoided for a number of β-octabromo-meso-tris(p-X-phenyl)corrole derivatives, where X=CF3, NO2, F, H, CH3, and OCH3; instead, analytically pure products may be obtained by recrystallization from chloroform/methanol. In addition, we have presented an optimized synthesis of the heretofore inaccessible, sterically hindered ligand β-octabromo-meso-tris(2,6-dichlorophenyl)corrole, H3[Br8TDCPC], via reductive demetallation of the corresponding Mn(III) complex. With our earlier report of β-octabromo-meso-tris(pentafluorophenyl)corrole, H3[Br8TPFPC], a comprehensive set of optimized synthetic protocols are thus in place for a good number of β-octabromo-meso-triarylcorrole ligands. Furthermore, we have illustrated the use of these ligands by synthesizing the iron complexes Fe[Br8TDCPC]Cl and Fe[Br8TDCPC](py)2, of which the latter lent itself to single-crystal X-ray structure determination.


Journal of Inorganic Biochemistry | 2016

Demetalation of copper undecaarylcorroles: Molecular structures of a free-base undecaarylisocorrole and a gold undecaarylcorrole.

Jan Capar; Job Zonneveld; Steffen Berg; Johan Isaksson; Kevin J. Gagnon; Kolle E. Thomas; Abhik Ghosh

Abstract Copper undecaarylcorroles were found to undergo acid-induced demetalation with unusual ease under both reductive and nonreductive conditions. The resulting free-base undecaarylcorroles were found to be rather reactive, readily photooxygenating to yield 5/10-hydroxyisocorroles and open-chain tetrapyrroles. The use of nonreductive conditions led to 50-75% yields of undecaarylisocorroles, a new class of sterically hindered ligands, of which one proved amenable to single-crystal X-ray structural analysis. In one case, interaction of an undecaarylisocorrole with gold(III) acetate resulted in aromatization of the macrocycle and a gold undecaarylcorrole. The Au complex exhibited Au-N distances of 1.941(3)–1.965(3) A, and no significant nonbonded interactions involving the gold. The significant solubility of this complex in organic solvents, compared with the relative insolubility of gold β -octabromo- meso -triarylcorroles, appears to be related to the lack of aurophilic and metallophilic interactions.


Journal of Chemical Education | 2011

Arrow Pushing: A Rational, Participatory Approach To Teaching Descriptive Inorganic Chemistry

Steffen Berg; Abhik Ghosh


Archive | 2014

Arrow Pushing in Inorganic Chemistry: A Logical Approach to the Chemistry of the Main-Group Elements

Abhik Ghosh; Steffen Berg


Journal of Chemical Education | 2013

Six Impossible Mechanisms Before Breakfast: Arrow Pushing as an Instructional Device in Inorganic Chemistry

Steffen Berg; Abhik Ghosh


European Journal of Inorganic Chemistry | 2015

Mechanisms of Oxygen Atom Transfer between Main‐Group Elements

Jeanet Conradie; Steffen Berg; Abhik Ghosh


Archive | 2014

Appendix B: A Short List of Advanced Organic Chemistry Textbooks

Abhik Ghosh; Steffen Berg


Archive | 2014

Appendix A: Inorganic Chemistry Textbooks, with a Descriptive‐Inorganic Focus

Abhik Ghosh; Steffen Berg


Arrow Pushing in Inorganic Chemistry: A Logical Approach to the Chemistry of the Main-Group Elements | 2014

Group 16 Elements: The Chalcogens

Abhik Ghosh; Steffen Berg


Arrow Pushing in Inorganic Chemistry: A Logical Approach to the Chemistry of the Main-Group Elements | 2014

The s‐Block Elements: Alkali and Alkaline Earth Metals

Abhik Ghosh; Steffen Berg

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Jan Capar

University of Tromsø

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Kevin J. Gagnon

Lawrence Berkeley National Laboratory

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Jeanet Conradie

University of the Free State

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Christine M. Beavers

Lawrence Berkeley National Laboratory

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