AC Kolloquium - Dr. habil. Christian Hering-Junghans

Non-Classical Double Bonds – Phoshaalkenes and Phosphaalumenes
Heavier element–element multiple bonds had been long considered inaccessible but have now moved beyond the status of lab curiosities. However, heteroatomic E13═E15 (E13 = Al, Ga; E15 = N, P, As) multiple bonds are still scarcely represented. Due to alternating Lewis acidic and Lewis basic centers, E13=E15 species are prone to oligomerize. Oligomerization can be suppressed by either kinetic, acceptor or donor stabilization. In our quest to design novel phosphaalkene-based ligand systems through the so-called phospha-Wittig reaction, we have uncovered the potential of phospha-Wittig reagents (ArPPMe3) as phosphinidene transfer reagents. These species allow facile access to phosphaalumenes and -gallenes in the reaction with sources of Al(I) opr Ga(I), respectively.