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https://www.readbyqxmd.com/read/27892585/elemental-steps-of-the-thermodynamics-of-dihydropyrimidine-a-new-class-of-organic-hydride-donors
#1
Fan-Kun Meng, Xiao-Qing Zhu
25 Dihydropyrimidine derivatives, a new class of organo-hydrides, were designed and synthesized by the Biginelli reaction. For the first time, the thermodynamic driving forces of the six elemental steps to obtain a hydride in acetonitrile were determined by isothermal titration and electrochemical methods, respectively. The effects of molecular structures and substituents on these thermodynamic parameters were examined, uncovering some interesting structure-reactivity relationships. Both the thermodynamic and kinetic studies show that the hydride transfer from dihydropyrimidines to 9-phenylxanthylium (PhXn(+)ClO4(-)) prefers a concerted mechanism...
November 28, 2016: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/27142288/gold-complexes-for-therapeutic-purposes-an-updated-patent-review-2010-2015
#2
REVIEW
Chiara Nardon, Nicolò Pettenuzzo, Dolores Fregona
Gold has always aroused great interest in the history of mankind. It has been used for thousands of years for jewelry, religious cult valuables, durable goods and in the art world. However, few know that such a precious and noble metal was exploited in the past by the ancients also for its therapeutic properties. More recently, in the twentieth century some complexes containing gold centers in the oxidation state +1 were studied for the treatment of the rheumatoid arthritis and the orally-administered drug Auranofin was approved by the FDA in 1985...
2016: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/27062480/organo-and-organometallic-catalytic-intramolecular-1-5-hydride-transfer-cyclization-process-through-c-sp-3-h-bond-activation
#3
Su Jin Kwon, Dae Young Kim
The direct functionalization of C(sp(3) )-H bonds is one of the most synthetically powerful research areas in current organic synthesis. Organocatalytic C(sp(3) )-H bond activation reactions have recently been developed in addition to the traditional metal-catalyzed C(sp(3) )-H activation reactions. In this review, we aim to give a brief overview of organo- and organometallic internal redox cascade reactions with respect to the mechanism, the reactivity of hydrogen donors and acceptors, and the migration modes of hydrogen...
June 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/27061313/new-penta-tetrathiafulvalenyl-60-fullerenes-for-supramolecular-materials
#4
Antoine Busseau, Carmen Villegas, Sylvie Dabos-Seignon, Clément Cabanetos, Piétrick Hudhomme, Stéphanie Legoupy
New penta(organo)fullerenes donor-acceptor systems bearing five tetrathiafulvalene recognition units have been synthesized to promote self-assemblies similar in appearance to shuttlecocks nested into each other thanks to the conical host cavity created around the fullerene together with the π-π and electronic interactions.
June 13, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27039108/genomic-and-physiological-analysis-reveals-versatile-metabolic-capacity-of-deep-sea-photobacterium-phosphoreum-ant-2200
#5
Sheng-Da Zhang, Claire-Lise Santini, Wei-Jia Zhang, Valérie Barbe, Sophie Mangenot, Charlotte Guyomar, Marc Garel, Hai-Tao Chen, Xue-Gong Li, Qun-Jian Yin, Yuan Zhao, Jean Armengaud, Jean-Charles Gaillard, Séverine Martini, Nathalie Pradel, Claude Vidaud, François Alberto, Claudine Médigue, Christian Tamburini, Long-Fei Wu
Bacteria of the genus Photobacterium thrive worldwide in oceans and show substantial eco-physiological diversity including free-living, symbiotic and piezophilic life styles. Genomic characteristics underlying this variability across species are poorly understood. Here we carried out genomic and physiological analysis of Photobacterium phosphoreum strain ANT-2200, the first deep-sea luminous bacterium of which the genome has been sequenced. Using optical mapping we updated the genomic data and reassembled it into two chromosomes and a large plasmid...
May 2016: Extremophiles: Life Under Extreme Conditions
https://www.readbyqxmd.com/read/26815652/donor-acceptor-organo-imido-polyoxometalates-high-transparency-high-activity-redox-active-nlo-chromophores
#6
Ahmed Al-Yasari, Nick Van Steerteghem, Hani El Moll, Koen Clays, John Fielden
We show that polyoxometalates (POMs) are an excellent redox-active acceptor on which to base high performance 2(nd) order non-linear optical (NLO) chromophores. This is demonstrated through three new organoimido-Lindqvist derivatives with HRS β0-values exceeding those of any dipolar organic system with comparable donor, π-system and absorption profile. Thus, organoimido POMs may provide a new generation of high performance, high transparency, and potentially redox-switchable NLO materials.
February 21, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/26589944/aminoglutethimide-imprinted-xerogels-in-bulk-and-spherical-formats-based-on-a-multifunctional-organo-alkoxysilane-precursor
#7
Porkodi Kadhirvel, Manuel Azenha, Paula Gomes, António F Silva, Börje Sellergren
The multifunctional alkoxysilane precursor, 2,6-bis(propyl-trimethoxysilylurelene)pyridine (DPS) was designed and synthesized, envisaging a multiple hydrogen-bond interaction in the molecular imprinting of the drug aminoglutethimide (AGT). Imprinted xerogels were obtained in bulk and spherical formats. The spherical format was achieved by pore-filling onto spherical mesoporous silica, as a straightforward technique to generate the spherical format. The bulk gels presented better selectivity for the template against its glutarimide (GLU) analogue (selectivity factor: bulk 13...
December 11, 2015: Journal of Chromatography. A
https://www.readbyqxmd.com/read/26057107/di-and-triethanolamine-grafted-kaolinites-of-different-structural-order-as-adsorbents-of-heavy-metals
#8
Anna Koteja, Jakub Matusik
Efficient sorbents based on widely available clay minerals are of particular value in the field of pollution control. The research shows mineral-based sorbents formed through organic modification of two kaolinites differing in structural order. Their structure and texture was characterized by XRD, FTIR, DTA/TG, CHN, XPS and N2 adsorption/desorption methods. The obtained materials were tested as adsorbents of Cd(II), Zn(II), Pb(II) and Cu(II) in equilibrium and kinetic experiments. Moreover, the sorption mechanisms were subjected to investigation...
October 1, 2015: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/26031405/reversible-doping-of-a-dithienothiophene-based-conjugated-microporous-polymer
#9
Hakan Bildirir, Ipek Osken, Turan Ozturk, Arne Thomas
Dithienothiophene (DTT) based conjugated microporous polymers (CMPs) were synthesized by bulk and electrochemical oxidative polymerizations. Spectroelectrochemical measurements showed that DTT-CMP can be reversibly oxidized and reduced, accompanied by a significant change of the absorption properties making the material interesting for electrochromic devices. Reversible doping and dedoping of the bulk polymer network was also observed using iodine and ammonia, respectively. Nitrogen gas sorption measurements of the neutral, doped, and dedoped polymer networks indicated the presence of iodide species within the pores, and the conductivity of the networks is highly increased upon doping with iodine...
June 22, 2015: Chemistry: a European Journal
https://www.readbyqxmd.com/read/25367132/environmental-applications-of-chitosan-and-its-derivatives
#10
REVIEW
Soon Kong Yong, Manoj Shrivastava, Prashant Srivastava, Anitha Kunhikrishnan, Nanthi Bolan
Chitosan originates from the seafood processing industry and is one of the most abundant of bio-waste materials. Chitosan is a by-product of the alkaline deacetylation process of chitin. Chemically, chitosan is a polysaccharide that is soluble in acidic solution and precipitates at higher pHs. It has great potential for certain environmental applications, such as remediation of organic and inorganic contaminants, including toxic metals and dyes in soil, sediment and water, and development of contaminant sensors...
2015: Reviews of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/25323134/reduction-of-co2-to-methanol-catalyzed-by-a-biomimetic-organo-hydride-produced-from-pyridine
#11
Chern-Hooi Lim, Aaron M Holder, James T Hynes, Charles B Musgrave
We use quantum chemical calculations to elucidate a viable mechanism for pyridine-catalyzed reduction of CO2 to methanol involving homogeneous catalytic steps. The first phase of the catalytic cycle involves generation of the key catalytic agent, 1,2-dihydropyridine (PyH2). First, pyridine (Py) undergoes a H(+) transfer (PT) to form pyridinium (PyH(+)), followed by an e(-) transfer (ET) to produce pyridinium radical (PyH(0)). Examples of systems to effect this ET to populate PyH(+)'s LUMO (E(0)(calc) ∼ -1...
November 12, 2014: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/24802764/insights-on-the-design-and-electron-acceptor-properties-of-conjugated-organophosphorus-materials
#12
Thomas Baumgartner
The development of conjugated organic materials has become a rapidly evolving field of research, particularly with a view toward practical applications in so-called organic electronics that encompass a variety of device types, such as OLEDs, OPVs, and OFETs. Almost all of these devices minimally require the presence of electron-donor and -acceptor components that act as p- and n-type semiconductors, respectively. Research over the past two decades has shown that while there is an abundant resource of organic p-type materials, suitable n-type species are few and far between...
May 20, 2014: Accounts of Chemical Research
https://www.readbyqxmd.com/read/23995975/a-new-type-of-organic-inorganic-hybrid-nlo-phore-with-large-off-diagonal-first-hyperpolarizability-tensors-a-two-dimensional-approach
#13
Shabbir Muhammad, Hongliang Xu, Zhongmin Su, Kotaro Fukuda, Ryohei Kishi, Yasuteru Shigeta, Masayoshi Nakano
We report a novel type of organic-inorganic hybrid material with rare two-dimensional nonlinear optical (NLO) properties. The density functional theory (DFT) calculations combined with the finite-field (FF) method show that the designed molecules (6,9 organo-derivatives of B10H14) could carry the characteristic NLO properties of both organic and inorganic materials. Interestingly, due to their unique V-shaped structures, they have large off-diagonal first hyperpolarizability tensors or nonlinear anisotropy, which is an advantage in their practical applications over conventional donor-π-acceptor (D-π-A) NLO-phores...
November 14, 2013: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/23697923/controlled-synthesis-of-racemic-indenyl-rare-earth-metal-complexes-via-the-cooperation-between-the-intramolecular-coordination-of-donor-atoms-and-a-bridge
#14
Shuangliu Zhou, Zhangshuan Wu, Lingmin Zhou, Shaowu Wang, Lijun Zhang, Xiancui Zhu, Yun Wei, Jinhua Zhai, Jie Wu
The reactions of Me2Si(C9H6CH2CH2-DG)2 (DG = NMe2 (1), CH2NMe2 (2), OMe (3), and N(CH2CH2)2O (4)) with [(Me3Si)2N]3RE(μ-Cl)Li(THF)3 in toluene afforded a series of racemic divalent rare-earth metal complexes: {η(5):η(1):η(5):η(1)-Me2Si(C9H5CH2CH2-DG)2}RE (DG = NMe2, RE = Yb (6) and Eu (7); DG = CH2NMe2, RE = Yb (8), Eu (9), and Sm (10); DG = OMe, RE = Yb (11) and Eu (12); DG = N(CH2CH2)2O, RE = Yb (13) and Eu (14)). Similarly, the racemic divalent rare-earth metal complexes {η(5):η(1):η(5):η(1)-Me2Si(C9H5CH2CH2CH2NMe2)(C9H5CH2CH2OMe)}RE (RE = Yb (15) and Eu (16)) were also obtained...
June 3, 2013: Inorganic Chemistry
https://www.readbyqxmd.com/read/23670170/paracetamol-aspirin-and-indomethacin-display-endocrine-disrupting-properties-in-the-adult-human-testis-in-vitro
#15
O Albert, C Desdoits-Lethimonier, L Lesné, A Legrand, F Guillé, K Bensalah, N Dejucq-Rainsford, B Jégou
STUDY QUESTION: Do mild analgesics affect the endocrine system of the human adult testis? SUMMARY ANSWER: Mild analgesics induce multiple endocrine disturbances in the human adult testis in vitro. WHAT IS KNOWN ALREADY: Mild analgesics have recently been incriminated as potential endocrine disruptors. Studies of the effects of these widely used molecules on the androgenic status of men are limited and somewhat contradictory. This prompted us to investigate whether these compounds could alter the adult human testicular function...
July 2013: Human Reproduction
https://www.readbyqxmd.com/read/23507957/the-coordination-chemistry-of-organo-hydride-donors-new-prospects-for-efficient-multi-electron-reduction
#16
Alex McSkimming, Stephen B Colbran
In biological reduction processes the dihydronicotinamides NAD(P)H often transfer hydride to an unsaturated substrate bound within an enzyme active site. In many cases, metal ions in the active site bind, polarize and thereby activate the substrate to direct attack by hydride from NAD(P)H cofactor. This review looks more widely at the metal coordination chemistry of organic donors of hydride ion - organo-hydrides - such as dihydronicotinamides, other dihydropyridines including Hantzsch's ester and dihydroacridine derivatives, those derived from five-membered heterocycles including the benzimidazolines and benzoxazolines, and all-aliphatic hydride donors such as hexadiene and hexadienyl anion derivatives...
May 28, 2013: Chemical Society Reviews
https://www.readbyqxmd.com/read/23432016/organo-modified-hydrotalcite-quantum-dot-nanocomposites-as-a-novel-chemiluminescence-resonance-energy-transfer-probe
#17
Shichao Dong, Fang Liu, Chao Lu
In this work, we fabricate an oriented luminescent quantum dot (QD)-layered double hydroxide (LDH) nanocomposite material by the highly orderly and alternate assembly of trace CdTe QDs in dodecylbenzene sulfonate bilayer bunches on the organo-modified LDH exterior surfaces. Interestingly, the novel QD-LDH nanocomposites can remarkably amplify chemiluminescence (CL) of the luminol-H2O2 system, which is attributed to an inhibition of QD oxidation by H2O2, an increase in the radiative decay rate, and an inhibition in the nonradiative relaxation of QDs...
March 19, 2013: Analytical Chemistry
https://www.readbyqxmd.com/read/23108191/silver-i-coordination-complexes-and-extended-networks-assembled-from-s-se-te-substituted-acenaphthenes
#18
Fergus R Knight, Rebecca A M Randall, Lucy Wakefield, Alexandra M Z Slawin, J Derek Woollins
Six related organo–chalconium silver(I) coordination complexes, including two examples of rare organotellurium-silver coordination, have been prepared and structurally characterised by X-ray crystallography. The series of 5-bromo-6-(phenylchalcogeno)acenaphthene ligands L1–L3 [Acenap(Br)(EPh)] (Acenap = acenaphthene-5,6-diyl; E = S, Se, Te) were independently treated with silver(I) salts (AgBF4, AgOTf). In order to keep the number of variables to a minimum, all reactions were carried out using a 1:1 ratio of Ag/L and run in dichloromethane...
January 7, 2013: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/22902168/new-concepts-and-best-practices-for-management-of-pre-and-post-transplantation-cancer
#19
REVIEW
Josep M Campistol, Valentín Cuervas-Mons, Nicolás Manito, Luis Almenar, Manuel Arias, Fernando Casafont, Domingo Del Castillo, María G Crespo-Leiro, Juan F Delgado, J Ignacio Herrero, Paloma Jara, José M Morales, Mercedes Navarro, Federico Oppenheimer, Martín Prieto, Luis A Pulpón, Antoni Rimola, Antonio Román, Daniel Serón, Piedad Ussetti
Solid-organ transplant recipients are at increased risk of developing cancer compared with the general population. Tumours can arise de novo, as a recurrence of a preexisting malignancy, or from the donated organ. The ATOS (Aula sobre Trasplantes de Órganos Sólidos; the Solid-Organ Transplantation Working Group) group, integrated by Spanish transplant experts, meets annually to discuss current advances in the field. In 2011, the 11th edition covered a range of new topics on cancer and transplantation. In this review we have highlighted the new concepts and best practices for managing cancer in the pre-transplant and post-transplant settings that were presented at the ATOS meeting...
October 2012: Transplantation Reviews
https://www.readbyqxmd.com/read/22724635/stereoselective-double-lewis-acid-organo-catalyzed-dimerization-of-donor-acceptor-cyclopropanes-into-substituted-2-oxabicyclo-3-3-0-octanes
#20
Roman A Novikov, Vladimir P Timofeev, Yury V Tomilov
A new approach for the dimerization of donor-acceptor cyclopropanes (2-arylcyclopropane-1,1-dicarboxylates) under double-catalysis conditions by treatment with 20 mol % of GaCl(3) and dimethyl 3,5-dimethyl-1-pyrazoline-3,5-dicarboxylate as a specific organocatalyst has been found. Under these conditions, the starting compounds are regio- and stereospecifically converted into polysubstituted 2-oxabicyclo[3.3.0]octanes. Two new rings, one C-O bond, and two C-C bonds are formed in this process, and four stereocenters are thus created...
July 20, 2012: Journal of Organic Chemistry
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