557-35-7Relevant articles and documents
Kinetics of 'initial burst' in the solid-liquid phase-transfer catalysis. Nucleophilic substitution of 2-octyl mesylate with potassium bromide
Yufit,Zinovyev
, p. 343 - 348 (2001)
The SN2 substitution of 2-octyl mesylate with solid KBr under the conditions of phase-transfer catalysis was studied kinetically using the model approach of 'initial burst.' It is suggested that such kinetics reflect the contribution of mass transfer and surface poisoning. The proposed model is used to explain the influences of catalyst, solvent, stirring speed, activation and agitation effects. The mechanistic scheme suggests that the reaction is described by two separate kinetic stages, one of which reflects the intrinsic rate-limited step and the other the mass transfer-controlled step. Copyright
Construction of chiral liquid crystal phosphorescent material based on cyclometalated platinum complex and application of chiral liquid crystal phosphorescent material in circular polarizer
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Paragraph 0021, (2020/06/09)
The invention discloses a chiral liquid crystal luminescent material based on a cyclometalated platinum complex and application of the chiral liquid crystal luminescent material. According to the invention, the cyclometalated platinum complex is used as a light-emitting core, and chiral alkyl chains and liquid crystal elements are respectively introduced to the peripheries of a main ligand and anauxiliary ligand to construct the chiral liquid crystal phosphorescent material. The material shows effective circular polarization luminescence performance in a solid film. The cyclometalated platinum complex is used as a doping agent of a light-emitting layer; a circular polarization organic light-emitting device is prepared through a solution method, the maximum external quantum efficiency is 11.3%, and the maximum electrogenerated circular polarization light-emitting asymmetry factor (glum) is 0.06; and the annealing temperature of the light-emitting layer has great influence on the circular polarization light-emitting performance of the device. The invention provides a research thought for constructing the efficient chiral liquid crystal phosphorescent material.
Palladium-Catalyzed Alkoxycarbonylation of Unactivated Secondary Alkyl Bromides at Low Pressure
Sargent, Brendon T.,Alexanian, Erik J.
supporting information, p. 7520 - 7523 (2016/07/06)
Catalytic carbonylations of organohalides are important C-C bond formations in chemical synthesis. Carbonylations of unactivated alkyl halides remain a challenge and currently require the use of alkyl iodides under harsh conditions and high pressures of CO. Herein we report a palladium-catalyzed alkoxycarbonylation of secondary alkyl bromides that proceeds at low pressure (2 atm CO) under mild conditions. Preliminary mechanistic studies are consistent with a hybrid organometallic-radical process. These reactions efficiently deliver esters from unactivated alkyl bromides across a diverse range of substrates and represent the first catalytic carbonylations of alkyl bromides with carbon monoxide.