Topic
Reagent
About: Reagent is a research topic. Over the lifetime, 60091 publications have been published within this topic receiving 1234928 citations. The topic is also known as: reagens.
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TL;DR: In this article, a review of manganese-, iron-, chromium-, and cobalt-catalyzed carbon−carbon bond formation reactions using Grignard reagents is presented.
179 citations
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TL;DR: In this article, a nucleophilic aniline tethered to an electrophilic carbonyl was designed as a bifunctional aminating reagent for both C(sp(2) )-H and C (sp(3) ) -H bonds under rhodium(III) catalysis.
Abstract: Previous direct C-H nitrogenation suffered from simple amidation/amination with limited atom-economy and is mostly limited to C(sp(2) )-H substrates. In this work, anthranil was designed as a novel bifunctional aminating reagent for both C(sp(2) )-H and C(sp(3) )-H bonds under rhodium(III) catalysis, thus affording a nucleophilic aniline tethered to an electrophilic carbonyl. A tridendate rhodium(III) complex has been isolated as the resting state of the catalyst, and DFT studies established the intermediacy of a nitrene species.
179 citations
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TL;DR: Interestingly, the good correlation between the densities of adsorbed Orange II and covalently grafted linkers suggests that the Orange II method is a relevant, reliable, easy, and inexpensive method to predict the amount of amino groups available for subsequent functionalization of polymer surfaces.
178 citations
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TL;DR: In this article, the photooxidative degradation of phenol in aqueous TiO2 dispersions has been revisited to determine the dependencies of the rate on the concentration of the phenol and on the photon flow (ρ) of the actinic light at 365nm.
Abstract: The photooxidative degradation of phenol in aqueous TiO2 dispersions has been revisited to determine the dependencies of the rate on the concentration of phenol and on the photon flow (ρ) of the actinic light at 365 nm. The principal objective was to assess the factors that influence the efficiency of the photocatalytic process, the rate of which is described by the function d C d t (ρ,C)=( const )C n ρ m where n and m are orders of the reaction with respect to concentration and photon flow (light intensity), respectively. The reaction order m varies with reagent concentration C, whereas the order n depends on photon flow ρ. The description indicates that m→1 if n→0, whereas n→1 if m→0. Therefore, the reaction orders m and n of phenol photodegradation are interdependent. A detailed kinetic description of the process is given based on two well-known mechanistic/kinetic models, namely (i) the Langmuir–Hinshelwood (LH) model whereby the organic reagent is pre-adsorbed on the photocatalyst surface prior to UV illumination, and (ii) the Eley–Rideal (ER) model for which the organic reagent diffuses from the solution bulk onto the photocatalyst surface to interact with the activated state of the photocatalyst. The kinetic treatment infers that it is possible (under certain conditions) to delineate between the LH and ER mechanistic models on the basis of the magnitude of the Langmuir constant KL at very high photon flow, i.e. when ρ→∞ {for the LH pathway, KL→K; for the ER model KL→0}, and on the dependence of kobs of the process on ρ. For the ER model, kobs scales linearly with ρ at high photon flow, whereas for the LH pathway kobs displays a sub-linear dependence on ρ and tends toward saturation at high photon flow.
178 citations
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TL;DR: Synthesis of the SCN-substituted dye 4, a new reagent for ultratrace detection of proteins, and hydrodechlorination of 1 to 3 in the presence of EtSNa or PhSNa/Ph 2 PH are described.
Abstract: The reactions of dye 1 with MeONa, MeNH 2 , PhONa, PhSNa, PhSH, and 4-H 2 NPhSH to yield the corresponding derivatives 2a-e, hydrodechlorination of 1 to 3 in the presence of EtSNa or PhSNa/Ph 2 PH, and synthesis of the SCN-substituted dye 4, a new reagent for ultratrace detection of proteins, are described
178 citations