Publications
41. | F. Brosge, T. Lorenz, H. Helten,* C. Bolm,* BN- and BO-Doped Inorganic—Organic Hybrid Polymers with Sulfoximine Core Units, Chem. Eur. J. 2019, DOI: 10.1002/chem.201903289 ("Hot Paper"). | |
40. | H. Helten,* Doping the Backbone of π-Conjugated Polymers with Tricoordinate Boron: Synthesis Strategies and Emerging Applications, Chem. Asian J. 2019, 14, 919—935 [DOI] (Minireview, invited). | |
39. | L. Fritze, N. A. Riensch, H. Helten,* Catalytic Si/B Exchange Condensation: A Green B—C Coupling Method That Provides Access to Monodisperse (Het)arylborane "Trimers", Synthesis 2019, 51, 399—406 [DOI] (Feature Article, invited). | |
38. | A. Lik, S. Jenthra, L. Fritze, L. Müller, K.-N. Truong, H. Helten,* From Monodisperse Thienyl- and Furylborane Oligomers to Polymers — Modulating the Optical Properties Through the Hetarene Ratio, Chem. Eur. J. 2018, 24, 11961—11972 [DOI] ("Very Important Paper", special issue: 7th EuCheMS Chemistry Congress, Liverpool). | |
37. | N. A. Riensch, L. Fritze, T. Schindler, M. Kremer, H. Helten,* Difuryl(supermesityl)borane: a versatile building block for extended π-conjugated materials, Dalton Trans. 2018, 47, 10399—10403 [DOI] (special issue: New Talent: Europe, invited). | |
36. | O. Ayhan, N. A. Riensch, C. Glasmacher, H. Helten,*
Cyclolinear Oligo- and Poly(iminoborane)s: The Missing Link in Inorganic Main Group Macromolecular Chemistry,
Chem. Eur. J. 2018, 24, 5883—5894 [DOI] ("Hot Paper").
Highlighted in: ChemistryViews [DOI]. Highlighted in: "Trendbericht Anorganische Chemie: Hauptgruppenelemente", C. Hering-Junghans, C. Sindlinger, Nachr. Chem. 2019, 67, 46—64 [DOI]. |
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35. | A. Lik, D. Kargin, S. Isenberg, Z. Kelemen,* R. Pietschnig,* H. Helten,*
PBP bridged [3]ferrocenophane: a bisphosphanylborane with a redox trigger,
Chem. Commun. 2018, 54, 2471—2474 [DOI].
Inside back cover: [DOI] |
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34. | N. A. Riensch, A. Deniz, S. Kühl, L. Müller, A. Adams, A. Pich,* H. Helten,*
Borazine-based inorganic—organic hybrid cyclomatrix microspheres by silicon/boron exchange precipitation polycondensation,
Polym. Chem. 2017, 8, 5264—5268 [DOI].
Inside front cover: [DOI] |
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33. | A. Lik, L. Fritze, L. Müller, H. Helten,* Catalytic B—C Coupling by Si/B Exchange: A Versatile Route to π-Conjugated Organoborane Molecules, Oligomers, and Polymers, J. Am. Chem. Soc. 2017, 139, 5692—5695 [DOI]. | |
32. | T. Lorenz, M. Crumbach, T. Eckert, A. Lik, H. Helten,*
Poly(p-phenylene iminoborane): A Boron—Nitrogen Analog of Poly(p-phenylene vinylene),
Angew. Chem. Int. Ed. 2017, 56, 2780—2784 [DOI];
Angew. Chem. 2017, 129, 2824—2828 [DOI] ("Hot Paper").
Highlighted in: "Iminoborane units add inorganic flavor to polymers", S. K. Ritter, Chem. Eng. News 2017, 95(8), 11 [DOI]. |
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31. | H. Helten,* O. Ayhan, T. Lorenz, Bor und Stickstoff statt Kohlenstoff, Nachr. Chem. 2017, 65, 535—541 [DOI]. | |
30. | H. Helten,* Conjugated Inorganic—Organic Hybrid Polymers, Encyclopedia of Inorganic and Bioinorganic Chemistry, 2017, 1—27 [DOI]. | |
29. | O. Ayhan, T. Eckert, F. A. Plamper, H. Helten,* Poly(iminoborane)s: An Elusive Class of Main Group Polymers?, Angew. Chem. Int. Ed. 2016, 55, 13321—13325 [DOI]; Angew. Chem. 2016, 128, 13515—13519 [DOI]. | |
28. | T. Lorenz, A. Lik, F. A. Plamper, H. Helten,*
Dehydrocoupling and Silazane Cleavage Routes to Organic—Inorganic Hybrid Polymers with NBN Units in the Main Chain,
Angew. Chem. Int. Ed. 2016, 55, 7236—7241 [DOI];
Angew. Chem. 2016, 128, 7352—7357 [DOI].
Highlighted in: "A New Route to Polymers with NBN Backbone", T. M. Swager, Q. Zhang, Synfacts 2016, 12, 0691 [DOI]. Highlighted in: "Trendbericht Makromolekulare Chemie 2016", M. Sommer, F. Wurm, Nachr. Chem. 2017, 65, 348—358 [DOI]. |
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27. | H. Helten,* B=N Units as Part of Extended π-Conjugated Oligomers and Polymers, Chem. Eur. J. 2016, 22, 12972—12982 [DOI] (Concept Article, invited). | |
26. | A. P. M. Robertson, E. M. Leitao, T. Jurca, M. F. Haddow, H. Helten,* G. C. Lloyd-Jones,* I. Manners,* Mechanisms of the Thermal and Catalytic Redistributions, Oligomerizations, and Polymerizations of Linear Diborazanes, J. Am. Chem. Soc. 2013, 135, 12670—12683. [DOI] | |
25. | H. Helten, B. Dutta, J. R. Vance, M. E. Sloan, M. F. Haddow, S. Sproules, D. Collison, G. R. Whittell, G. C. Lloyd-Jones, I. Manners, Paramagnetic Titanium(III) and Zirconium(III) Metallocene Complexes as Precatalysts for the Dehydrocoupling/Dehydrogenation of Amine—Boranes, Angew. Chem. Int. Ed. 2013, 52, 437—440; Angew. Chem. 2013, 125, 455—458 ("Very Important Paper"). | |
24. | E. M. Leitao, N. E. Stubbs, A. P. M. Robertson, H. Helten, R. J. Cox, G. C. Lloyd-Jones, I. Manners, Mechanism of Metal-Free Hydrogen Transfer between Amine—Boranes and Aminoboranes, J. Am. Chem. Soc. 2012, 134, 16805—16816. | |
23. | V. Blackstone, S. Pfirrmann, H. Helten, A. Staubitz, A. Presa Soto, G. R. Whittell, I. Manners, A Cooperative Role for the Counteranion in the PCl5-Initiated Living, Cationic Chain Growth Polycondensation of the Phosphoranimine Cl3P=NSiMe3, J. Am. Chem. Soc. 2012, 134, 15293—15296. | |
22. | H. Helten, A. P. M. Robertson, A. Staubitz, J. R. Vance, M. F. Haddow, I. Manners, “Spontaneous” Ambient Temperature Dehydrocoupling of Aromatic Amine—Boranes, Chem. Eur. J. 2012, 18, 4665—4680. | |
21. | J. Marinas Pérez, H. Helten, G. Schnakenburg, R. Streubel, A Novel Approach to 1,3,4-Dioxaphospholane Complexes: Acid-Induced Ring Expansion of an Oxaphosphirane Complex. The Problem of Construction and Deconstruction of O,P-Heterocycles, Chem. Asian J. 2011, 6, 1539—1545. | |
20. | H. Helten, G. Schnakenburg, J. Daniels, A. J. Arduengo, III, R. Streubel, When Sterics Overcome Electronics: An Unusual Haptotropic P→N Pentacarbonyltungsten Shift, Organometallics 2011, 30, 84—91. | |
19. | H. Helten, G. Schnakenburg, R. Streubel, Click Reactions of 2H-Azaphosphirene Chromium and Molybdenum Complexes and a Surprisingly Facile Access to a 2H-1,4,2-Diazaphosphole Derivative, Polyhedron 2011, 30, 1799—1805. | |
18. | J. Marinas Pérez, H. Helten, B. Donnadieu, C. A. Reed, R. Streubel, Protonation-Induced Rearrangement of an Oxaphosphirane Complex, Angew. Chem. Int. Ed. 2010, 49, 2615—2618; Angew. Chem. 2010, 122, 2670—2674. | |
17. | J. Marinas Pérez, C. Albrecht, H. Helten, G. Schnakenburg, R. Streubel, Competing ring cleavage of transient O-protonated oxaphosphirane complexes: 1,3-oxaphospholane and η2-Wittig ylide complex formation, Chem. Commun. 2010, 46, 7244—7246. | |
16. | R. Streubel, J. Marinas Pérez, H. Helten, J. Daniels, M. Nieger, Developing click reactions of a 3-ferrocenyl-2H-azaphosphirene complex, Dalton Trans. 2010, 39, 11445—11450. | |
15. | S. Fankel, H. Helten, G. von Frantzius, G. Schnakenburg, J. Daniels, V. Chu, C. Müller, R. Streubel, Novel access to azaphosphiridine complexes and first applications using Brønsted acid-induced ring expansion reactions, Dalton Trans. 2010, 39, 3472—3481. | |
14. | H. Helten, M. Beckmann, G. Schnakenburg, R. Streubel, Synthesis and Reactivity of an Unusual Ferrocenophane Bis(carbene complex), Eur. J. Inorg. Chem. 2010, 2337—2341. | |
13. | H. Helten, J. Daniels, M. Nieger, R. Streubel, Extended π conjugation in 2H-1,4,2-diazaphosphole complexes, New J. Chem. 2010, 34, 1593—1602. | |
12. | H. Helten, M. Engeser, D. Gudat, R. Schilling, G. Schnakenburg, M. Nieger, R. Streubel, Protonation of 2H-Azaphosphirene Complexes: P—N Bond Activation and Ring-Expansion Reactions, Chem. Eur. J. 2009, 15, 2602—2616. | |
11. | H. Helten, J. Marinas Pérez, J. Daniels, R. Streubel, First Brønsted Acid-Induced Ring Expansion of an Oxaphosphirane Complex: A Combined Experimental and DFT Study, Organometallics 2009, 28, 1221—1226. | |
10. | H. Helten, S. Fankel, O. Feier-Iova, M. Nieger, A. Espinosa Ferao, R. Streubel, Strong Evidence for an Unprecedented Borderline Case of Dissociation and Cycloaddition in Open-Shell 1,3-Dipole Chemistry: Transient Nitrilium Phosphane-Ylide Complex Radical Cations, Eur. J. Inorg. Chem. 2009, 3226—3237. | |
9. | H. Helten, G. von Frantzius, G. Schnakenburg, J. Daniels, R. Streubel, How To Tune Acid-Induced Ring Enlargement Reactions — The Strange Case of 2H-Azaphosphirene Complexes and Its Surprising Dichotomy, Eur. J. Inorg. Chem. 2009, 2062—2065. | |
8. | R. Streubel, M. Beckmann, C. Neumann, S. Fankel, H. Helten, O. Feier-Iova, P. G. Jones, M. Nieger, Synthesis, Structure, and Ring-Expansion Reactions of a 3-Ferrocenyl-Substituted 2H-Azaphosphirene Tungsten Complex, Eur. J. Inorg. Chem. 2009, 2090—2095. | |
7. | H. Helten, C. Neumann, A. Espinosa, P. G. Jones, M. Nieger, R. Streubel, Evidence for Ligand-Centered Reactivity of a 17e Radical Cationic 2H-Azaphosphirene Complex, Eur. J. Inorg. Chem. 2007, 4669—4678. | |
6. | R. Vicik, H. Helten, T. Schirmeister, B. Engels, Rational Design of Aziridine-Containing Cysteine Protease Inhibitors with Improved Potency: Studies on Inhibition Mechanism, ChemMedChem 2006, 1, 1021—1028. | |
5. | H. Helten, T. Schirmeister, B. Engels, Theoretical Studies about the Influence of Different Ring Substituents on the Nucleophilic Ring Opening of Three-Membered Heterocycles and Possible Implications for the Mechanisms of Cysteine Protease Inhibitors, J. Org. Chem. 2005, 70, 233—237. | |
4. | H. Helten, T. Schirmeister, B. Engels, Model Calculations about the Influence of Protic Environments on the Alkylation Step of Epoxide, Aziridine, and Thiirane Based Cysteine Protease Inhibitors, J. Phys. Chem. A 2004, 108, 7691—7701. | |
3. | P. W. Musch, C. Remenyi, H. Helten, B. Engels, On the Regioselectivity of the Cyclization of Enyne-Ketenes: A Computational Investigation and Comparison with the Myers-Saito and Schmittel Reaction, J. Am. Chem. Soc. 2002, 124, 1823—1828. | |
2. | B. Walfort, T. Auth, B. Degel, H. Helten, D. Stalke, Copper and Silver Triimidosulfites: S(NtBu)32--Bicapped M3-Triangles Connected via Lithium Halide Ladders or Fragments Thereof, Organometallics 2002, 21, 2208—2214. | |
1. | M. Schmittel, J.-P. Steffen, M. Maywald, B. Engels, H. Helten, P. Musch, Ring size effects in the C2—C6 biradical cyclisation of enyne-allenes and the relevance for neocarzinostatin, J. Chem. Soc., Perkin Trans. 2 2001, 1331—1339. |