Search for: All records | NSF Public Access

Note: When clicking on a Digital Object Identifier (DOI) number, you will be taken to an external site maintained by the publisher. Some full text articles may not yet be available without a charge during the embargo (administrative interval).
What is a DOI Number?

Some links on this page may take you to non-federal websites. Their policies may differ from this site.

A Stable Naked Dithiolene Radical Anion and Synergic THF Ring-Opening

https://doi.org/10.1021/jacs.0c08495

Wang, Yuzhong ; Xie, Yaoming ; Wei, Pingrong ; Blair, Soshawn A. ; Cui, Dongtao ; Johnson, Michael K. ; Schaefer, Henry F. ; Robinson, Gregory H. ( October 2020 , Journal of the American Chemical Society)
null (Ed.)
Full Text Available
Stable Boron Dithiolene Radicals

https://doi.org/10.1002/anie.201804298

Wang, Yuzhong ; Xie, Yaoming ; Wei, Pingrong ; Blair, Soshawn A. ; Cui, Dongtao ; Johnson, Michael K. ; Schaefer, III, Henry F. ; Robinson, Gregory H. ( May 2018 , Angewandte Chemie International Edition)

Abstract
Whereas low‐temperature (−78 °C) reaction of the lithium dithiolene radical1^.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).

more » « less
Stable Boron Dithiolene Radicals

https://doi.org/10.1002/ange.201804298

Wang, Yuzhong ; Xie, Yaoming ; Wei, Pingrong ; Blair, Soshawn A. ; Cui, Dongtao ; Johnson, Michael K. ; Schaefer, III, Henry F. ; Robinson, Gregory H. ( May 2018 , Angewandte Chemie)

Abstract
Whereas low‐temperature (−78 °C) reaction of the lithium dithiolene radical1^.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).

more » « less
Occupancy surveys with conditional replicates: An alternative sampling design for rare species

https://doi.org/10.1111/2041-210X.12842

Specht, Hannah M. ; Reich, Henry T. ; Iannarilli, Fabiola ; Edwards, Margaret R. ; Stapleton, Seth P. ; Weegman, Mitch D. ; Johnson, Michael K. ; Yohannes, Brittney J. ; Arnold, Todd W. ; Schofield, ed., Matthew ( December 2017 , Methods in Ecology and Evolution)