Research activities of the Uhl group were directed towards the organoelement chemistry of the heavier Group 13, 14 and 15 elements.
![](/imperia/md/images/anorganische_und_analytische_chemie/ak_uhl/fittosize_161_227_52ffd5c381b138ae7fff06e5de60d80a_al-cluster_1.bmp)
- Macromulecules and huge cage compounds with supramolecular entities were obtained based on Ga-Ga bonds and functional carboxylates.
-
Homonuclear clusters of the elements Al, Ga and In in unusual low oxidation states close to +I were obtained. They found wide application in Main Group and Transition Metal chemistry.
-
Deprotonation of C-H acidic organoaluminium compounds resulted in the formation of interesting heterocyclic molecules.
![](/imperia/md/images/anorganische_und_analytische_chemie/ak_uhl/fittosize_200_295_4ecbac8fffa5e489d4f5b02e13430297_carbalane2.jpg)
- Hydrazides of Al, Ga and In showed a wide structural diversity. A completely deprotonated hydrazine, a hydrazinetetraide, was stabilized by six Ga atoms.
- Very unusual peroxides were isolated and characterized, which in a very strange situation had highly reducing E-C bonds (E = Al, Ga, In) beside oxidizing peroxo groups.
- Functionalization of silanes and germanes by Lewis acids resulted in the activation of E-X bonds (E = Si, Ge) and an approach to a cationic character of these elements.
![](/imperia/md/images/anorganische_und_analytische_chemie/ak_uhl/fittosize_163_220_194fc570adf2354b985f93ffa9a988a2_flp.jpg)
- Active Lewis pairs based on Al or Ga and N atoms showed a completely different structural chemistry and were applied in numerous reactions including catalytic processes (together with Prof. Würthwein).
![](/imperia/md/images/anorganische_und_analytische_chemie/ak_uhl/fittosize_214_213_0f55c5c8de3506994ddedcfa884d9cb8_phosphaallen.jpg)
- Phosphaallenes were synthesized on a facile route in a multigram scale, which allowed their systematic application in various secondary reactions.
- Novel strained heterocyclic phosphines with the P atom exclusively bound to C atoms showed a unique reactivity by ring opening, coordination, oxidation or reduction.