128796-39-4Relevant articles and documents
Biphenyl compound, liquid crystal composition containing biphenyl compound and application thereof
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Paragraph 0201-0205, (2021/05/01)
The invention relates to a biphenyl compound, a liquid crystal composition containing the biphenyl compound and an application thereof. Specifically, the invention discloses a biphenyl compound of which the structure is shown as a formula I, and the definition is shown in the specification in detail. The invention further discloses the liquid crystal composition. The liquid crystal composition at least comprises one or more compounds in a compound shown as a formula I. The liquid crystal composition has improved physical parameters, such as higher dielectric constant anisotropy, higher optical anisotropy, lower rotary viscosity and the like, has the advantages of realizing quick response, reducing energy consumption, improving image quality and the like, and is suitable for a liquid crystal display in an IPS mode.
Magnesium promoted autocatalytic dehydrogenation of amine borane complexes: A reliable, non-cryogenic, scalable access to boronic acids
Marciasini, Ludovic D.,Richard, Jimmy,Cacciuttolo, Bastien,Sartori, Guillaume,Birepinte, Melodie,Chabaud, Laurent,Pinet, Sandra,Pucheault, Mathieu
, p. 164 - 171 (2018/12/05)
Owing to the unusual reactivity of dialkylamine-borane complexes, a methodology was developed to simply access boronic acids. The intrinsic instability of magnesium aminoborohydride was tweaked into a tandem dehydrogenation borylation sequence. Proceeding via an autocatalytic cycle, amineborane dehydrogenation was induced by a variety of Grignard reagents. Overall, addition of the organomagnesium species onto specially designed dialkylamine-borane complexes led to a variety of boronic acids in high yields. In addition, the reaction can be performed under Barbier conditions, on a large scale.
Copper-Catalyzed Monoorganylation of Trialkyl Borates with Functionalized Organozinc Pivalates
Fu, Ying,Gou, Bei-Lei,Shi, Chun-Zhao,Du, Zhengyin,Shen, Tong
, p. 4253 - 4257 (2018/09/18)
Organozinc pivalates, a recently developed air- and moisture-stable organozinc species, were found for the first time as excellent organometallic species in the monoorganylation of trialkyl borates whereby boronic acids were prepared in high yields. The significant advantage of organozinc pivalates over another previously employed organometallic reagents, e. g., organolithium reagents, Grignard reagents and organozinc halides, is that the generation of multiorganylation byproducts such as borinic acids and trialkylboranes were completely suppressed. Additionally, the in situ generated boronates could be directly arranged into Suzuki-Miyaura type cross-coupling reactions to produce biaryls in high yields.