Reaction of carbene‐stabilized disilicon (
Reaction of carbene‐stabilized disilicon (
- Award ID(s):
- 1661604
- NSF-PAR ID:
- 10156179
- Publisher / Repository:
- Wiley Blackwell (John Wiley & Sons)
- Date Published:
- Journal Name:
- Angewandte Chemie
- Volume:
- 132
- Issue:
- 23
- ISSN:
- 0044-8249
- Page Range / eLocation ID:
- p. 8949-8952
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
More Like this
-
Abstract 1 ) with the lithium‐based dithiolene radical (2. ) affords the first dianionic silicon tris(dithiolene) complex (3 ). Notably, the formation of3 represents the unprecedented utilization of carbene‐stabilized disilicon (1 ) as a silicon‐transfer agent. The nature of3 was probed by multinuclear NMR spectroscopy, single‐crystal X‐ray diffraction, and DFT computations. -
Abstract Whereas low‐temperature (−78 °C) reaction of the lithium dithiolene radical
1 .with boron bromide gives the dibromoboron dithiolene radical2 ., the parallel reaction of1 .with (C6H11)2BCl (0 °C) affords the dicyclohexylboron dithiolene radical3 .. Radicals2 .and3 .were characterized by single‐crystal X‐ray diffraction, UV/Vis, and EPR spectroscopy. The nature of these radicals was also probed computationally. Under mild conditions,3 .undergoes unexpected thiourea‐mediated B−C bond activation to give zwitterion4 , which may be regarded as an anionic dithiolene‐modified carbene complex of the sulfenyl cation RS+(R=cyclohexyl). -
Abstract Whereas low‐temperature (−78 °C) reaction of the lithium dithiolene radical
1 .with boron bromide gives the dibromoboron dithiolene radical2 ., the parallel reaction of1 .with (C6H11)2BCl (0 °C) affords the dicyclohexylboron dithiolene radical3 .. Radicals2 .and3 .were characterized by single‐crystal X‐ray diffraction, UV/Vis, and EPR spectroscopy. The nature of these radicals was also probed computationally. Under mild conditions,3 .undergoes unexpected thiourea‐mediated B−C bond activation to give zwitterion4 , which may be regarded as an anionic dithiolene‐modified carbene complex of the sulfenyl cation RS+(R=cyclohexyl). -
Abstract The 1 : 2 reaction of the imidazole‐based dithiolate (
2 ) with GeCl2 • dioxane in THF/TMEDA gives3 , a TMEDA‐complexed dithiolene‐based germylene. Compound3 is converted to monothiolate‐complexed (5 ) and N‐heterocyclic carbene‐complexed (7 ) germanium(II) dithiolene complexes via Lewis base ligand exchange. A bis‐dithiolene‐based germylene (8 ), involving a 3c–4e S‐Ge‐S bond, has also been synthesized through controlled hydrolysis of7 . The bonding nature of3 ,5 , and8 was investigated by both experimental and theoretical methods. -
Abstract The chemical dynamics of the elementary reaction of ground state atomic silicon (Si;3P) with germane (GeH4; X1A1) were unraveled in the gas phase under single collision condition at a collision energy of 11.8±0.3 kJ mol−1exploiting the crossed molecular beams technique contemplated with electronic structure calculations. The reaction follows indirect scattering dynamics and is initiated through an initial barrierless insertion of the silicon atom into one of the four chemically equivalent germanium‐hydrogen bonds forming a triplet collision complex (HSiGeH3;
3 i1 ). This intermediate underwent facile intersystem crossing (ISC) to the singlet surface (HSiGeH3;1 i1 ). The latter isomerized via at least three hydrogen atom migrations involving exotic, hydrogen bridged reaction intermediates eventually leading to the H3SiGeH isomeri5 . This intermediate could undergo unimolecular decomposition yielding the dibridged butterfly‐structured isomer1 p1 (Si(μ‐H2)Ge) plus molecular hydrogen through a tight exit transition state. Alternatively, up to two subsequent hydrogen shifts toi6 andi7 , followed by fragmentation of each of these intermediates, could also form1 p1 (Si(μ‐H2)Ge) along with molecular hydrogen. The overall non‐adiabatic reaction dynamics provide evidence on the existence of exotic dinuclear hydrides of main group XIV elements, whose carbon analog structures do not exist.