Molybdenum and Tungsten Alkylidyne Complexes Containing Mono-, Bi-, and Tridentate N -Heterocyclic Carbenes

Elser, Iris; Groos, Jonas; Hauser, Philipp M.; Koy, Maximilian; van der Ende, Melita; Wang, Dongren; Frey, Wolfgang; Wurst, Klaus; Meisner, Jan; Ziegler, Felix; Kästner, Johannes; Buchmeiser, Michael R.

doi:10.1021/acs.organomet.9b00481

Title: Molybdenum and Tungsten Alkylidyne Complexes Containing Mono-, Bi-, and Tridentate N -Heterocyclic Carbenes

Journal Article · 18 October 2019 · Organometallics

DOI: https://doi.org/10.1021/acs.organomet.9b00481 · OSTI ID:1598275

Elser, Iris ^[1]; Groos, Jonas ^[1]; Hauser, Philipp M. ^[1]; Koy, Maximilian ^[1]; van der Ende, Melita ^[1]; Wang, Dongren ^[1]; Frey, Wolfgang ^[2]; Wurst, Klaus ^[3];

^[4]; Ziegler, Felix ^[1];

^[4];

^[1]

Univ. of Stuttgart (Germany). Inst. of Polymer Chemistry
Univ. of Stuttgart (Germany). Inst. of Organic Chemistry
Univ. of Innsbruck (Austria). Inst. of General, Inorganic and Theoretical Chemistry
Univ. of Stuttgart (Germany). Inst. for Theoretical Chemistry

In this work, new tungsten and molybdenum alkylidyne complexes bearing mono-, bi-, and tridentate N-heterocyclic carbenes (NHCs) have been synthesized. Formation of unprecedented structures in complexes bearing N-tert-butyl substituents on the imidazol(in)-2-ylidene was observed, leading to molybdenum complexes containing an abnormal carbene (Mo-4) and a bridging O,C,C-pincer ligand (Mo-10) and to a tungsten complex containing a cationic imidazolinium-tagged alkoxide forming an inner salt with an anionic tungsten center (W-5). Both the abnormal carbene binding in Mo-4 and the O,C,C-pincer-type structure of Mo-10 were confirmed by single-crystal X-ray analysis, and the proposed structure of W-5 is supported by the single-crystal X-ray structure of a minor byproduct (W-8) formed during the synthesis of W-4, displaying the aforementioned inner-salt-like structure. The novel alkylidyne complexes were also investigated for their capability to form a previously postulated quasi-cationic species with a weakly coordinating anion (WCA) during the alkyne homometathesis of 1-phenyl-1-propyne. Overall, incorporation of bidentate and strongly $$σ$$ donating NHCs as well as introduction of better leaving groups did not lead to the expected increase in catalytic activity. Despite identical ligand spheres, changing from molybdenum to tungsten led to complete loss of activity in the bidentate systems.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); German Research Foundation (DFG)

Grant/Contract Number:: AC02-76SF00515; 358283783-CRC 1333

OSTI ID:: 1598275

Journal Information:: Organometallics, Vol. 38, Issue 21; ISSN 0276-7333

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Publication data for: "Molybdenum and Tungsten Alkylidyne Complexes Containing Mono-, Bi-, and Tridentate N-Heterocyclic Carbenes" - data from Buchmeiser group Elser, Iris; Groos, Jonas; Hauser, Philipp Manuel DaRUS https://doi.org/10.18419/darus-1689	dataset	January 2021

Cited By (1)

Cationic Tungsten Alkylidyne N -Heterocyclic Carbene Complexes: Synthesis and Reactivity in Alkyne Metathesis: Cationic Tungsten Alkylidyne N -Heterocyclic Carbene Complexes: Synthesis and Reactivity in Alkyne Metathesis Hauser, Philipp M.; van der Ende, Melita; Groos, Jonas European Journal of Inorganic Chemistry https://doi.org/10.1002/ejic.202000503	journal	June 2020

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36 MATERIALS SCIENCE
Chemical structure
Metals
Ligands
Particulate matter
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CCDC 1861321: Experimental Crystal Structure Determination Iris, Elser,; Jonas, Groos,; M., Hauser, Philipp https://doi.org/10.5517/ccdc.csd.cc20gvmz The current record is supplemented by this dataset	dataset	January 2019
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