642-31-9Relevant academic research and scientific papers
Regulating signal enhancement with coordination-coupled deprotonation of a hydrazone switch
Foy, Justin T.,Ray, Debdas,Aprahamian, Ivan
, p. 209 - 213 (2014)
Proton relay plays an important role in many biocatalytic pathways. In order to mimic such processes in the context of molecular switches, we developed coordination-coupled deprotonation (CCD) driven signaling and signal enhancement sequences. This was ac
Ag nanoparticle immobilized on functionalized magnetic hydrotalcite (Fe3O4/HT-SH-Ag) for clean oxidation of alcohols with TBHP
Salimi, Mehri,Zamanpour, Azadeh
, (2020)
Hydrotalcite (HT) modified with magnetic nanoparticle and thiol groups for the immobilization of silver to the preparation of Fe3O4/HT-SH-Ag was used. The catalyst was completely characterized using XRD, ICP, SEM, EDS, VSM, FT-IR, and TEM analyzes. The Fe3O4/HT-SH-Ag catalyst is useful in oxidizing of primary and secondary aliphatic and benzyl alcohols to the relevant carbonyl products (aldehyde/ketone). To demonstrate the effect of Ag over the reaction, Fe3O4/HT-SH catalyst performance, and also some other control tests were studied. For this purpose, the model reaction was carried out in the presence of AgNO3, HT (I), and Fe3O4/HT (II), and low yield was obtained (20–50%). High to good efficiency were obtained for all entries, whether benzaldehyde derivatives, in short times. The catalyst can be reused for several continuous runs with a simple external magnet without losing significant reactivity.
A new acetal as a fluorescent probe for highly selective detection of Fe3+ and its application in bioimaging
Wang, Min,Zhang, Yong-Ming,Zhao, Qin-Yi,Fu, Zhen-Hai,Zhang, Zhi-Hong
, (2019)
A simple fluorescent probe L for Fe3+ was easily synthesized based on anthracene. Among the various metal ions including Fe2+, this probe exhibited high sensitivity and good selectivity toward Fe3+ with turn-off fluorescence mode in DMSO-HEPES buffer solution (20 mM, pH = 7.0, 1:1 (v/v)). When adequate Fe3+ ion was added into the solution of probe L, its molecular structure transferred from anthraldehyde dimethyl acetal to anthraldehyde, resulting in fluorescence quenching with a low detection limit of 3.08 μM. 1H NMR spectra and TLC analysis further supported this concept. Finally, this probe was successfully applied in bioimaging.
Bacteriorhodopsin analogue from anthryl chromophores
Singh,Roy
, p. 383 - 389 (1990)
Preparation and properties of the bacteriorhodopsin (bR) analogue having the 3,7-dimethyl-9-(9-anthryl)-2E, 4E,6E,8E-nonatetraenal (12) chromophore is described. Synthesis of the chromophore has been achieved by successive introduction of C5 units to 9-anthraldehyde (3) via the Horner reaction. The all-trans chromophore has been characterized by its ultraviolet-visible and 1H nuclear magnetic resonance spectra. Incubation of 12 with bacterioopsin suspension (prepared by photobleaching of bR isolated from Halobacterium halobium) at ambient temperature in the dark gave the new bR analogue 15, which showed an absorption band at 545 nm, and an opsin shift of 5575 cm-1. The new pigment is stable to hydroxyl amine in the dark. It showed light-dark adaptation with the light-adapted from absorbing at a slightly red-shifted value of 550 nm. All-trans-retinal did not replace the anthryl chromophore in competitive bindings. Photolysis of the bR analogue 15, followed by difference spectrophotometric analysis, indicated formation of a photoproduct with an absorption band near 400 nm. The results are discussed in terms of the steroelectronic requirements of the bR reaction centre.
A new OsO4-mediated carbon-carbon bond cleavage reaction leading to the formation of anthraquinone
Gao, Shouhai,Wang, Wei,Wang, Binghe
, p. 48 - 49 (2001)
A new OsO4-mediated carbon-carbon bond cleavage reaction leading to the formation of anthraquinone was observed. The reaction goes through the dihydroxylated intermediate and is aided by the presence of pyridine.
Nickel(II)-Catalyzed Selective (E)-Olefination of Methyl Heteroarenes Using Benzyl Alcohols via Acceptorless Dehydrogenative Coupling Reaction
Balamurugan, Gunasekaran,Ramesh, Rengan
, (2021/11/30)
An efficient catalytic protocol for the synthesis of selective (E)-olefins by the newly synthesized nickel complexes via greener acceptorless dehydrogenative coupling methodology is presented. Two nickel(II) N, S chelating complexes were structurally characterized with the aid of spectral and single crystal X-ray diffraction methods. Olefination of 2-methylheteroarenes with benzyl alcohols via acceptorless dehydrogenative coupling is achieved by inexpensive nickel(II) catalysts. The present olefination protocol is simple and furnishes the desired 2-alkenylheteroarenes in 35 h and yields in the range of 40–93 %. The dehydrogenative coupling reaction proceeds via the generation of an aldehyde intermediate and produces water and hydrogen as sole by-products. The wide substrate scope of this catalytic reaction covered the synthesis of drug intermediates.
A bagasse-supported magnetic manganese dioxide nanoparticle: applications in the selective aerobic oxidation of alcohols and one-pot tandem oxidative synthesis of quinazolinones
Farhid, Hassan,Hajishaabanha, Fatemeh,Rashidi Vahid, Adina,Shaabani, Ahmad,Shaabani, Shabnam
, (2022/01/24)
Magnetic manganese dioxide nanoparticles (MnO2-Fe3O4) were coated on sugarcane bagasse as a sugar industrial waste and bio-support (MnO2-Fe3O4@bagasse) via an in situ reduction strategy, in which potassium permanganate was used as the precursor of MnO2 and sugarcane bagasse as a bio-support and reducing agent of KMnO4. The synthesized bio-based catalyst was characterized by X-ray diffraction, thermogravimetric analysis, inductively coupled plasma optical emission spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, Brunauer–Emmett–Teller surface area analysis, and vibrating sample magnetometer analysis. The catalyst was successfully utilized in the selective aerobic oxidation of primary and secondary benzylic alcohols to their corresponding carbonyl compounds and one-pot tandem oxidative synthesis of 2-(substituted)quinazoline-4(3H)-ones from the o-aminobenzamide and aromatic alcohols in the absence of oxidizing reagent or initiator. Graphical abstract: [Figure not available: see fulltext.]
Nitrosoarene-Catalyzed HFIP-Assisted Transformation of Arylmethyl Halides to Aromatic Carbonyls under Aerobic Conditions
Pradhan, Suman,Sharma, Vishali,Chatterjee, Indranil
supporting information, p. 6148 - 6152 (2021/08/03)
A rare metal-free nucleophilic nitrosoarene catalysis accompanied by highly hydrogen-bond-donor (HBD) solvent, 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP), organocatalytically converts arylmethyl halides to aromatic carbonyls. This protocol offers an effective means to access a diverse array of aromatic carbonyls with good chemoselectivity under mild reaction conditions. The activation of arylmethyl halides by HFIP to generate stable carbocation and autoxidation of in situ generated hydroxylamine to nitrosoarene in the presence of atmospheric O2 are the keys to success.
Catalytic study of the copper-based magnetic nanocatalyst on the aerobic oxidation of alcohols in water
Dehkordi, S. Saeid Saei,Albadi, Jalal,Jafari, Abbas Ali,Samimi, Heshmat Allah
, p. 2527 - 2538 (2021/03/24)
A copper-based magnetic nanocatalyst has been prepared by co-precipitation method and characterized by FESEM, EDS, TEM, XRD, XRF, ICP–OES, FTIR, and BET analysis. This new nanocatalyst displays a good activity toward the aerobic oxidation of a wide range of alcohols in water. Moreover, it is recyclable up to five following runs by simple filtration without any significant loss of its catalytic activity.
Magnetic spent coffee ground as an efficient and green catalyst for aerobic oxidation of alcohols and tandem oxidative Groebke–Blackburn–Bienaymé reaction
Farhid, Hassan,Shaabani, Ahmad
, p. 1199 - 1209 (2020/11/09)
Abstract: In this work, magnetic spent coffee ground as a green, inexpensive, and abundant material was synthesized and characterized by a variety of techniques, including X-ray diffraction pattern, thermal gravimetric analysis, scanning electron microscopy, energy-dispersive spectroscopy, inductively coupled plasma optical emission spectrometry, and Fourier transform infrared spectroscopy. The magnetic spent coffee ground was successfully utilized as a catalyst in aerobic oxidation of primary and secondary benzylic alcohols and tandem oxidative Groebke–Blackburn–Bienaymé reaction. Graphic abstract: [Figure not available: see fulltext.].
