- Iridium catalysts for acceptorless dehydrogenation of alcohols to carboxylic acids: Scope and mechanism
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We introduce iridium-based conditions for the conversion of primary alcohols to potassium carboxylates (or carboxylic acids) in the presence of potassium hydroxide and either [Ir(2-PyCH2(C4H5N2))(COD)]OTf (1) or [Ir(2-PyCH2PBu2t)(COD)]OTf (2). The method provides both aliphatic and benzylic carboxylates in high yield and with outstanding functional group tolerance. We illustrate the application of this method to a diverse variety of primary alcohols, including those involving heterocycles and even free amines. Complex 2 reacts with alcohols to form the crystallographically characterized catalytic intermediates [IrH(η1,η3-C8H12)(2-PyCH2PtBu2)] (2a) and [Ir2H3(CO)(2-PyCH2PtBu2){μ-(C5H3N)CH2PtBu2}] (2c). The unexpected similarities in reactivities of 1 and 2 in this reaction, along with synthetic studies on several of our iridium intermediates, enable us to form a general proposal of the mechanisms of catalyst activation that govern the disparate reactivities of 1 and 2, respectively, in glycerol and formic acid dehydrogenation. Moreover, careful analysis of the organic intermediates in the oxidation sequence enable new insights into the role of Tishchenko and Cannizzaro reactions in the overall oxidation.
- Cherepakhin, Valeriy,Williams, Travis J.
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p. 3754 - 3763
(2018/05/23)
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- Bithiophene sulfonamide-based molecular and polymeric semiconductors
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The present invention relates to new semiconducting compounds having at least one optionally substituted bithiophene sulfonamide moiety. The compounds disclosed herein can exhibit high carrier mobility and/or efficient light absorption/emission characteristics, and can possess certain processing advantages such as solution-processability and/or good stability at ambient conditions.
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Page/Page column 77-78
(2017/06/23)
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- Novel organic semiconductor compound and organic electronic device using the same
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The present invention relates to an organic semiconductor compound and a use thereof. The organic semiconductor of the present invention has high charge mobility, low on/off ratio, high thermal stability, and high solubility; and thereby an organic thin film transistor and an organic solar cell comprising the same can have high efficiency and can be mass-produced based on a solution process.
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Paragraph 0092-0097
(2016/10/08)
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- Novel alkylhalide compounds and method for preparing the same
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The present invention relates to a novel alkyl halide compound and a method for preparing the same. The alkyl halide compound according to the present invention can be applied to all polymers and single molecules which are used in an organic semiconductor, and thus the organic semiconductor materials incorporating the novel alkyl group have an improved solubility due to the novel alkyl group, thereby facilitating manufacturing of an element through solution processes of spin coating, dye casting, printing, etc. In addition, the alkyl halide compound can improve properties of the element by controlling the shape and crystallinity of a film.
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Paragraph 0080-0083
(2017/01/05)
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- Novel alkylhalide compounds and method for preparing the same
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The present invention refers to new alkylene halide compound and manufacturing method relates to, alkyl halide compound the present invention according to the organic semiconductor which can be used for all new applied to monomolecular polymer and alkyl alkyl novel organic semiconductor material have been introduced having improved solubility is due to various solvent added spin coating, die casting, printing of fluid, e.g., process fabrication of one end of the end, the type and volume of the film element characteristics for modulating determined the objective compound..
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Paragraph 0075-0078
(2016/10/27)
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