Pietschnig Lab Kassel

well, temperature and pressure are important details here...

well done @k-eichhorn.bsky.social both in terms of cover artwork and the underlying chemistry

Congratulations from my side as well, it was my pleasure to be on the committee

Just out: luminescent molecules with a simple clip: congratulations to @k-eichhorn.bsky.social for developing a general strategy for attaching a carboxylic group at phospholes, just accepted in @chemcomm.rsc.org
pubs.rsc.org/en/Content/A...
#chemsky #PiSky

Excellent start with an intermetallic masterpiece, congratulations @fabiandankert.bsky.social

hot chemistry...

Fresh chillies and lacto fermentation of chillies

Wow! Nearly 17k views of my @ActaCrystC.IUCr.org paper about the #SCXRD #CrystalStructure of spicy capsaicin. Time to celebrate with some chillies! 🌶🌶🌶
doi.org/10.1107/S205...
#ChemSky #RealTimeChem #Crystallography #Capsaicin #Capsicum #Diffraction

Excellent!

First free N-heterocyclic carbene (NHC) stable in liquid water

#ChemSky

excellent, this is pleasure and honor for all Uni Bonn alumni as well!

Excellent demonstration by @riedellab.bsky.social‬
how chemistry can drive industrially relevant transformation in terms of safety and sustainability #science #chemsky

What a nice recognition for our lab, two of our articles received a certificate as top 10% of most-viewed papers published by the journal in 2023! Many thanks to all co-authors involved 👍 and of course to our readers 😊

Congratulations to @k-eichhorn.bsky.social for winning a poster price for her contribution at the beautyfully organized 19th Ferrocene Colloquium at #RuhrUniBochum

A Fresh Twist on the Phospha-(Aza)-Wittig Reaction The reactivity of an unsupported phosphinidene oxide, BnArNP═O (Bn = benzyl; Ar = bulky aryl group), as the electrophilic partner in Wittig reactions with ylides is described. Reactions with methylene-triphenylphosphorane (H2C═PPh3) and ethylidene-triphenyl-phosphorane (HMeC═PPh3), proceed as expected, giving rise to the phosphaalkene metathesis products and triphenylphosphine oxide. This reaction can be extended to other ylides such as N-(triphenylphosphoranylidene)methanamine (MeN═PPh3), to afford an aminoiminophosphane BnArNP═NMe. In these reactions the phosphinidene oxide plays the role of an electrophile, which would typically be the remit of an organic carbonyl in classical Wittig reactions. Further mechanistic insight into such transformations can be gained by altering the nature of the phosphorus-ylide. Upon reacting BnArNP═O with H2C═PMe3 (which possesses a smaller, more Lewis basic, phosphine) an alternative product is formed. This transformation supports the formation of a betaine intermediate that subsequently undergoes hydrogen-migration to afford an oxidized phosphorus(V) compound related to phosphorus acid.

Fresh out of the oven. Check out Chenyang’s most recent work in JACS (@jacs.acspublications.org). We explore the reactivity of a phosphinidene oxide as the electrophilic partner in Wittig transformations. Hope you enjoy.

pubs.acs.org/doi/full/10....

good news for tea drinkers:

congratulations and well deserved

a black plastic spatula

I was quoted in The Australian today discussing a recent study on chemicals in cookware that was found to have greatly overestimated the concentrations present, as well as how this error slipped through cracks in the peer-review system.

archive.md/2025.01.24-0...

#science #Chemsky #news

Halogenated Trityl Cations as Easy‐to‐Access Super Electrophiles Herein, we present the first easy-to-access synthesis of the perfluorotrityl cation (15F+) with commercial GaCl3 and the further functionalization of the para-fluorine atoms of 15F+ via halodefluorin...

Now anyone is able to synthesise it😉 Just out in @angewandtechemie.bsky.social. Easily accessible route for fluorinated trityl cations, stable at RT. Huge hydride affinity to activate alkanes such as n-pentane, n-butane. Great work by Johanna Schlögl and team. onlinelibrary.wiley.com/doi/10.1002/...

What a beautiful heteroallylic cation...

The EUCOMCXXVI will be held in the beautiful city of Bern Switzerland in July 6 - 10, 2025. We look forward to welcome you all! Follow this #bluesky account for updates and to find out a bit more about our exciting line up of speakers #SCS #euchems @unibern.bsky.social
eucomc2025.scg.ch

Tuning the sterics: Rh-catalyzed hydroformylation reactions with ferrocene based diphosphorus ligands The mono- and bidentate ligands FcPPh2 (1), FcPtBu2 (2), FcPMes2 (3), Fc’(PPh2)2 (dppf), Fc’(PMes2)2 (4), Fc’(PMes2)(PPh2) (5), and Fc’(PMes2)(PtBu2) …

Recent results from our cooperation on hydroformylation with @kelemen-group.bsky.social and Christian Müller's group, just out in J. Catal. #Chemsky #Inorganic #Catalysis
www.sciencedirect.com/science/arti...

Our Tetraphosphenium ion has just been accepted in Chemical Science @roysocchem.bsky.social. Many thanks to @kelemen-group.bsky.social for this fruitful collaboration #diamondopenaccess #ChemSky. Check it out at doi.org/10.1039/D4SC...

so did I...

many thanks, and sorry, I just searched for Beckmann. Now I deleted my misleading reply.

Our review on 1,1′-Disubstituted Ferrocene Ligand Scaffolds Featuring Pnictogens Other than Phosphorus as Donor Sites co-authored with Subhayan Dey from VIT just appeared #openaccess #chemsky www.mdpi.com/1420-3049/29...

Expanding the Landscape of Phosphorous‐Based Open Shell Species: Stable Mono‐, Di‐, and Trianionic Radicals Based on a Contorted Triphosphaalkene The sequential single-electron reduction of a truxene-based triphosphaalkene afforded mono-, di-, and triradical anionic species. X-ray crystallography revealed a highly contorted truxene core in the....

Introducing the group with a recent paper by Asif Mohd Ansari, Rajesh Deka and Anders Thapper elucidating mono- di and tri-radicals based on contorted polyaromatics functionalized with phosphaalkenes.
Congratulations 🎉 🎉
onlinelibrary.wiley.com/doi/10.1002/...

The “chemical tug-of-war” in carborane clusters: distinct tuning on different sides of the cluster The special C–C bond in icosahedral closo-dicarbadodecaboranes and its high plasticity have been highlighted several times, which is reflected in the ease of tuning the C–C bond distance with differen...

If you like carboranes, these results from the Kelmen group published in Inorganic Chemistry Frontiers are for you:
The “chemical tug-of-war” in carborane clusters.
pubs.rsc.org/en/content/a...
#chemsky #chemistry @unikassel.bsky.social

That does not look correct, with N featuring five regular bonds despite having only four valence orbitals... The second bond should rather be a broken not a full line to indicate the delocalization

Congratulations to Filip for his recent paper: Exploring the Stability of Primary Phosphine Oxides: Correlation with Primary Phosphine's Air-Stability? (#chemsky chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/...

Blocking the phosphorus lone-pairs in bisphosphanyltetrylenes results in cationic bisphosphoniotetrylenes which stay monomeric in case of the stannylene while the corresponding plumbylene dimerizes via the anion. Many thanks to all collaborators in our study in this ICCOC-GTL special issue.

We combine our Happy New Years greetings with our just published results in Advanced Science featuring reversible P-P bond activation with transition metal carbonyls. You can read open access thanks to project #DEAL onlinelibrary.wiley.com/doi/10.1002/...