- Zig-Zag Type Molecular Design Strategy of N-Type Hosts for Sky-Blue Thermally-Activated Delayed Fluorescence Organic Light-Emitting Diodes
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N-type hosts for long lifetime in sky-blue thermally-activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs) were investigated by synthesizing four hosts with zig-zag-type backbone structure for high triplet energy. The four hosts had
- Yang, Chang Yoon,Lee, Kyung Hyung,Lee, Jun Yeob
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- C-H Borylation Catalysts that Distinguish between Similarly Sized Substituents like Fluorine and Hydrogen
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By modifying ligand steric and electronic profiles it is possible to C-H borylate ortho or meta to substituents in aromatic and heteroaromatic compounds, where steric differences between accessible C-H sites are small. Dramatic effects on selectivities between reactions using B2pin2 or 4,4,5,5-tetramethyl-1,3,2-dioxaborolane (HBpin) are described for the first time. Judicious ligand and borane combinations give highly regioselective C-H borylations on substrates where typical borylation protocols afford poor selectivities.
- Miller, Susanne L.,Chotana, Ghayoor A.,Fritz, Jonathan A.,Chattopadhyay, Buddhadeb,Maleczka, Robert E.,Smith, Milton R.
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supporting information
p. 6388 - 6392
(2019/08/26)
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- Process for producing cyano substituted arene boranes and compounds
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A process for producing cyano substituted arene boranes is described. The compounds are useful intermediates to pharmaceutical compounds using the cyano group as a reactant.
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Page/Page column 11
(2008/06/13)
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- Sterically directed functionalization of aromatic C-H bonds: Selective borylation ortho to cyano groups in arenes and heterocycles
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Ir-catalyzed borylations of 4-substituted benzonitriles are described. In contrast to electrophilic aromatic substitutions and directed ortho metalations, C-H activation/borylation enables functionalization at the 2-position, adjacent to the cyano group, when the 4-subsitutent is larger than cyano. When an excess of borane reagent is used, diborylation can be achieved with a single regioisomer being formed in certain cases. Extension of sterically directed borylation to cyano-substituted, five- and six-membered ring heterocycles is also reported.
- Chotana, Ghayoor A.,Rak, Michael A.,Smith, Milton R.
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p. 10539 - 10544
(2007/10/03)
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