Recent Publications

I'm a paragraph. Click here to add your own text and edit me. It’s easy. Just click “Edit Text” or double click me to add your own content and make changes to the font. Feel free to drag and drop me anywhere you like on your page. I’m a great place for you to tell a story and let your users know a little more about you.


74. Electrophilic Terminal Arsinidene-Iron(0) Complexes with a Two-coordinated Arsenic Atom

       M. K. Sharma, B. Neumann, H.-G. Stammler, D. M. Andrada, R. S. Ghadwal*

    Chem. Commun. 2019, voldoi10.1039/C9CC08630G.

The electrophilic arsinidene complexes 5 and 6 featuring a two-coordinated arsenic atom have been isolated as crystalline solids. Complex 5 readily reacts with an NHC nucleophile (IMe4) to give the Lewis adduct 7.

72. Crystalline Divinyldiarsene Radical Cations and Dications

       M. K. Sharma, S. Blomeyer, B. Neumann, H.-G. Stammler, M. van Gastel, A. Hinz, R. S. Ghadwal* 

    Angew. Chem. Int. Ed. 2019, vol, doi: 10.1002/anie.201909144.

One-by-one electron oxidation of diarsenes [As2] featuring very efficient π-donor N-heterocyclic vinyl substituents with GaCl3 leads to the formation of radical cations [As2] and dications [As2] as crystalline solids. Experimental and computational studies revealed the delocalization of unpaired electron over the π-conjugated CAs2C framework.

73. Direct Functionalization of White Phosphorus with Anionic Dicarbenes and Mesoionic Carbenes: Facile Access to


       D. Rottschäfer, S. Blomeyer, B. Neumann, H.-G. Stammler, R. S. Ghadwal*

    Chem. Sci. 2019, vol, doi: 10.1039/C9SC04441H.

Unprecedented [1+3] fragmentation of white phosphorus (P4) and thus the capturing of the P3+ fragment with anionic dicarbenes (ADCs) has been shown to afford the 1,2,3-triphosphol-2-ides I in 93-98% yield. The mesoionic heterocycles I feature 6π-electron C2P3 and C3N2 aromatic systems and serve as two-electron σ-donor ligands. 

71. Diphosphene radical cations and dications with a π-conjugated C2P2C2-framework

       M. K. Sharma, D. Rottschäfer, S. Blomeyer, B. Neumann, H.-G. Stammler, M. van Gastel, A. Hinz, R. S. Ghadwal* 

      Chem. Commun. 2019, 55, 10408–10411.

The synthesis and characterization of the crystalline diphosphene radical cations [{(NHC)C(Ph)}P]2(GaCl4)Ÿ (NHC = IPr = C{(NDipp)CH}2, SIPr = C{(NDipp)CH2}2; Dipp = 2,6-iPr2C6H3) and dications [{(NHC)C(Ph)}P]2(GaCl4)(NHC = IPr, SIPr) featuring a π-conjugated C2P2C2-framework has been reported.

70. Stable Carbon-Centered Radicals Based on N-Heterocyclic Carbenes (Invited Article)

       R. S. Ghadwal*

      SynLett.  2019, 30,  1765-–1775.

69. Crystalline Divinyldiarsenes and Cleavage of the As=As Bond

       M. K. Sharma, S. Blomeyer, B. Neumann, H.-G. Stammler, R. S. Ghadwal*

      Chem. Eur. J.  201925,  8249–8253.

Making and breaking the As=As bond: The divinyldiarsene I (solid-state molecular structure: right) with a strikingly small HOMO-LUMO energy gap (3.86 eV) was prepared by the reduction of the dichloroarsane II. The As=As bond of I can be readily cleaved with C2Cl6, restoring II. This transformation is also viable with AuCl. Complex I endured oxidative bond metatheses with PhEEPh (E=Se or Te), producing derivatives III-E.

68. A Modular Access to Divinyldiphosphenes with a Strikingly Small HOMO--LUMO Energy Gap

       D. Rottschäfer, M. K. Sharma, B. Neumann, H.-G. Stammler, D. M. Andrada, R. S. Ghadwal* 

      Chem. Eur. J.  201925,  8127–8134.

P=P π-Conjugation: A modular synthetic route to the divinyldiphosphenes III with the smallest HOMO-LUMO energy gap (4.15 to 4.52 eV) has been established. Compounds III are accessible as deeply colored (inset) crystalline solids on reduction of the corresponding dichlorides II with magnesium. A divinyldiphosphene readily undergoes P=P bond cleavage reaction on treatment of Sto give the rare vinyldithiophosphorane IV. (5: IPr-Derivative and 6: SIPr-Derivative.)

67. A Phosphorus Analogue of p-Quinodimethane with a Planar P4 Ring: A Metal-Free Diphosphorus Source

        D. Rottschäfer, B. Neumann, H.-G. Stammler, R. Kishi, M. Nakano, R. S. Ghadwal* 

      Chem. Eur. J.  201925, 3244–3247.

Metal-Free P2 Transfer: A phosphorus analogue of p-quinodimethane [(IPrC)2P4] (5) (IPr=1,3-Bis(2,6-diisopropylphenyl)imidazol-2-ylidene) was readily accessible through KC8-reduction of (IPrC)(PCl2)2 (2). The P4 ring of 5 is perfectly planar and embedded with trans-apical N-heterocyclic vinylidene ligands. Compound 5 served as a metal-free diphosphorus (P2) source, which was captured with 1,3-cyclohexadiene (CHD), giving P2(CHD)2 (6).

Anorganische Chemie und Strukturchemie (ACS)

Fakultät für Chemie, Universität Bielefeld

E4-124, Universiätsstr. 25

D-33615 Bielefeld

Tel: 0049-521-106-6167 (Off.)



© Ghadwal Research Group 2015