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CATEGORIES:Conferences/Seminars/Lectures
DESCRIPTION:Pnictaalumenes and Pn\,Al-Heterocycles\n\nC. Hering-Junghans1\n
 1 Leibniz Institute for Catalysis e.V.\, Albert-Einstein-Straße 29a\, 18059
  Rostock.\n\nEmail: christian.hering-junghans@catalysis.de\n\nHeavier eleme
 nt–element multiple bonds had been long considered inaccessible but have no
 w moved beyond the status of lab curiosities. The number of heteroatomic Al
 ═E multiple bonds is still limited\,[1] and only recently terminal aluminiu
 m-imides have been structurally characterized\, obtained by the reaction of
  potassium aluminyls or neutral alanediyls with azides.[2] Examples of unsu
 pported aluminium phosphorus or arsenic multiple bonds have not been report
 ed. Su theoretically investigated compounds of the type R–P≡Al–R and stated
 : “...sterically bulky ligands can greatly stabilize the R–P≡Al– R species”
 .[3] Due to alternating Lewis acidic and Lewis basic centers\, AlP species 
 are prone to oligomerize. Oligomerization should be suppressed by either ki
 netic stabilization\, acceptor stabilization of the group 15 element\, or b
 y intra- or intermolecular interaction of the Lewis acidic metal center wit
 h a donor.\n\nIn this lecture the facile synthesis of pnictaalumenes and -g
 allenes is described\, afforded by the combination of Pnicta-Wittig reagent
 s of the type ArPn(PMe3) (Ar = terphenyls\; Pn = P\, As) with sources of Al
 (I) opr Ga(I)\, respectively. This afforded DipTerPnAlCp*\, compounds with 
 Pn-Al multiple bond character.[4] Furthermore\, the steric influence of the
  group attached to phosphorus was investigated\, as the reaction of Cp*Al o
 r Cp3tAl with the sterically less demanding MesTerP(PMe3) afforded 2π- arom
 atic P2Al-ring systems. The reactivities of DipTerPnAlCp* towards small mol
 ecules such as CO2\, C2H4\, C2H2\,[5] N2O and azides were studied and insig
 hts into their reactivity are discussed. Lastly\, the reversible\, photoche
 mically induced formation of gallaphosphenes will be described.[6]\n\n \n\n
  \n\nReferences:\n[1] P. Bag\, C. Weetman\, S. Inoue\, Angew. Chem.\, Int. 
 Ed. 2018\, 57\, 14394.\n[2] M. D. Anker\, R. J. Schwamm\, M. P. Coles\, Che
 m. Commun. 2020\, 56\, 2288\; b) A. Heilmann\, J. Hicks\, P. Vasko\, J. M. 
 Goicoechea\, S. Aldridge\, Angew. Chem.\, Int. Ed. 2020\, 59\, 4897\; c) J.
  D. Queen\, S. Irvankoski\, J. C. Fettinger\, H. M. Tuononen\, P. P. Power\
 , J. Am. Chem. Soc. 2021\, 143\, 6351.\n[3] J.-S. Lu\, M.-C. Yang\, M.-D. S
 u\, Chem. Phys. Lett. 2017\, 686\, 60.\n[4] M. Fischer\, S. Nees\, T. Kupfe
 r\, J. T. Goettel\, H. Braunschweig\, C. Hering-Junghans\, J. Am. Chem. Soc
 .\, 2021\, 143\, 4106.\n[5] S. Nees\, T. Wellnitz\, F. Dankert\, M. Härter
 ich\, S. Dotzuaer\, M. Feldt\, H. Braunschweig\, C. Hering- Junghans\, Ange
 w. Chem. Int. Ed. 2023\, 62\, e202215838.\n[6] T. Taeufer\, D. Michalik\, J
 . Pospech\, J. Bresien\, C. Hering-Junghans\, Chem. Sci. 2023\,14\, 3018.
DTEND:20230824T200000Z
DTSTAMP:20260314T121110Z
DTSTART:20230824T180000Z
LOCATION:Building 56\, 56-114
SEQUENCE:0
SUMMARY:Special Inorganic Chemistry Seminar with Dr. Christian Hering-Jungh
 ans (Leibniz Institut für Katalyse e.V)
UID:tag:localist.com\,2008:EventInstance_43951931386549
URL:https://calendar.mit.edu/event/special_inorganic_chemistry_seminar_with
 _dr_christian_hering-junghans_leibniz_institut_fur_katalyse_ev
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