keyword
MENU ▼
Read by QxMD icon Read
search

Ortho

keyword
https://www.readbyqxmd.com/read/28643513/photochemical-cleavage-of-benzylic-c-o-bond-facilitated-by-an-ortho-or-meta-amino-group
#1
Xiong Ding, Pengfei Wang
The excited state meta effect, also known as the meta-ortho effect, results from selective electron transmission from an electron-donating group to the meta and ortho sites on an aromatic ring in its first excited singlet state. This effect facilitates photochemical cleavage of benzylic C-O or C-N bond to release the corresponding alcohol, carboxylic acid, or amine when an electron-donating amino group is at the meta position, as demonstrated in our recent work of using a 3-diethylaminobenzyl (DEABn) group as an effective photolabile protecting group (PPG)...
June 23, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28643096/-results-of-the-pilot-phase-of-the-age-trauma-registry-dgu%C3%A2
#2
Benjamin Bücking, Erich Hartwig, Ulrike Nienaber, Ulla Krause, Thomas Friess, Ulrich Liener, Maria Hevia, Christopher Bliemel, Matthias Knobe
BACKGROUND: Since 2014, hospitals with ortho-geriatric fracture centres could be certified as AltersTraumaZentrum DGU® in Germany. To measure the quality of treatment in these centres, a geriatric trauma registry (AltersTraumaRegister DGU®) was established. OBJECTIVES: The aim of this work was to report the results of the pilot phase of the AltersTraumaRegister DGU® from the year 2015. MATERIALS AND METHODS: Included were 118 patients >70 years with hip fracture or implant-related femoral fractures...
June 22, 2017: Der Unfallchirurg
https://www.readbyqxmd.com/read/28642085/comparison-of-glutathione-levels-measured-using-optimized-monochlorobimane-assay-with-those-from-ortho-phthalaldehyde-assay-in-intact-cells
#3
Jan Čapek, Martina Hauschke, Lenka Brůčková, Tomáš Roušar
Fluorometric glutathione assays have been generally preferred for their high specificity and sensitivity. An additional advantage offered by fluorescent bimane dyes is their ability to penetrate inside the cell. Their ability to react with glutathione within intact cells is frequently useful in flow cytometry and microscopy. Hence, the aims of our study were to use monochlorobimane for optimizing a spectrofluorometric glutathione assay in cells and then to compare that assay with the frequently used ortho-phthalaldehyde assay...
June 19, 2017: Journal of Pharmacological and Toxicological Methods
https://www.readbyqxmd.com/read/28642057/novel-multifunctional-dental-cement-to-prevent-enamel-demineralization-near-orthodontic-brackets
#4
Yansong Ma, Ning Zhang, Michael D Weir, Yuxing Bai, Hockin H K Xu
OBJECTIVES: White spot lesions due to biofilm acid-induced enamel demineralization are prevalent in orthodontic treatments. The aim of this study was to develop a novel bioactive multifunctional cement with protein-repellent, antibacterial and remineralizing capabilities, and investigate the effects on enamel hardness and lesion depth in vitro for the first time. MATERIALS AND METHODS: 2-Methacryloyloxyethyl phosphorylcholine (MPC), dimethylaminohexadecyl methacrylate (DMAHDM), and nanoparticles of amorphous calcium phosphate (NACP) were incorporated into a resin-modified glass ionomer (RMGI)...
June 19, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28641003/synthesis-and-anti-inflammatory-evaluation-of-2-aminobenzaldehydes-via-ir-iii-catalyzed-c-h-amidation-of-aldimines-with-acyl-azides
#5
Saegun Kim, Prashant Chakrasali, Hyo Sun Suh, Neeraj Kumar Mishra, Taeyoung Kim, Sang Hoon Han, Hyung Sik Kim, Byung-Moo Lee, Soo Bong Han, In Su Kim
The aldimine-directed C-H amidation of various arenes with N-acyl azides as amidation surrogates under cationic iridium(III) catalysis is described. This transformation efficiently provides a range of 2-aminobenzaldehydes derivatives with excellent site-selectivity and functional group compatibility. The resulting 2-aminobenzaldehyde framework provides facile access to a range of biologically interesting heterocycles. In addition, all synthetic compounds were screened for anti-inflammatory activity against interleukin-1β (IL-1β) and tumor necrosis factor alpha (TNF-α) with lipopolysaccharide (LPS)-induced RAW264...
June 22, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28639642/cleavage-of-ethers-in-an-ionic-liquid-enhancement-selectivity-and-potential-application
#6
William E S Hart, Leigh Aldous, Jason B Harper
The cleavage of a series of ethers was examined in an ionic liquid containing hydrogen bromide. Reactions that did not proceed in either water or DMSO were found to proceed readily in this system, with notable selectivity between the cleavage of the different ether types examined herein. Increasing the proportion of water in the reaction mixture dramatically decreased the rate constant of ether cleavage; this could, in part, be attributed to a decrease in the solvent stabilisation of the transition state. Through analysis of the electronic requirements of the reaction (using substrates containing substituents with different Hammett parameters) and observation of rate enhancements for an ortho substituted system, the importance of the extent of protonation of the ether prior to nucleophilic attack was demonstrated...
June 22, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28638652/crystal-structure-of-a-silver-cobalt-and-iron-based-phosphate-with-an-alluaudite-like-structure-ag1-655co1-64fe1-36-po4-3
#7
Adam Bouraima, Thomas Makani, Abderrazzak Assani, Mohamed Saadi, Lahcen El Ammari
The new silver-, cobalt- and iron-based phosphate, silver cobalt iron tris(ortho-phosphate), Ag1.655Co1.64Fe1.36(PO4)3, was synthesized by solid-state reactions. Its structure is isotypic to that of Na2Co2Fe(PO4)3, and belongs to the alluaudite family, with a partial cationic disorder, the Ag(I) atoms being located on an inversion centre and twofold rotation axis sites (Wyckoff positions 4a and 4e), with partial occupancies of 0.885 (2) and 0.7688 (19), respectively. One of the two P atoms in the asymmetric unit completely fills one 4e site while the Co and Fe atoms fill another 4e site, with partial occupancies of 0...
June 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28638634/synthesis-and-crystal-structure-of-a-new-magnesium-phosphate-na3rbmg7-po4-6
#8
Teycir Ben Hamed, Amal Boukhris, Abdessalem Badri, Mongi Ben Amara
A new magnesium phosphate, Na3RbMg7(PO4)6 [tris-odium rubidium hepta-magnesium hexakis(ortho-phosphate)], has been synthesized as single crystals by the flux method and exhibits a new structure type. Its original structure is built up from MgO x (x = 5 and 6) polyhedra linked directly to each other through common corners or edges and reinforced by corner-sharing with PO4 tetra-hedra. The resulting anionic three-dimensional framework leads to the formation of channels along the [010] direction, in which the Na(+) cations are located, while the Rb(+) cations are located in large inter-stitial cavities...
June 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28636809/visible-light-driven-aza-ortho-quinone-methide-generation-enables-a-multicomponent-reaction
#9
Wen-Jing Xiao, Yi-Ying Liu, Xiao-Ye Yu, Miao-Maio Qiao, Xiaotian Qi, Jia-Rong Chen, De-Qing Shi
A visible light photoredox-catalyzed and radical-mediated strategy for the in situ generation of aza-ortho-quinone methides from readily accessible alkenylanilines and alkyl radical precursors has been accomplished for the first time. This protocol enables an efficient multicomponent cascade reaction of alkenylanilines, halides and sulfur ylides, and shows wide substrate scope and high functional group tolerance with respect to each component. Treatment of the initially formed cycloaddition products with a base leads to a convergent and streamlined synthesis of densely functionalized indoles in a single flask operation...
June 21, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28636378/what-is-the-structure-of-the-antitubercular-natural-product-eucapsitrione
#10
Glenn A Pullella, Duncan Andrew Wild, Gareth L Nealon, Mikhail Elyashberg, Matthew J Piggott
1,5,7-Trihydroxy-6H-indeno[1,2-b]anthracene-6,11,13-trione (1), proposed to be the antitubercular natural product eucapsitrione, has been synthesised in 43% overall yield, and six steps, including a key Suzuki-Miyaura biaryl coupling and a directed remote metalation (DReM)-initiated cyclisation. The physical and spectroscopic properties of 1 do not match the data reported for the natural product. At this time there is insufficient information available to enable a structure reassignment. During the optimization of the Suzuki-Miyaura coupling an unprecedented biaryl coupling ortho to the borono group was observed...
June 21, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28636367/cobalt-catalyzed-regioselective-ortho-c-sp2-h-bond-nitration-of-aromatics-through-proton-coupled-electron-transfer-pcet-assistance
#11
Desaboini Nageswar Rao, Sk Rasheed, Gaurav Raina, Qazi Naveed Ahmed, Chaitanya Kumar Jaladanki, Prasad V Bharatam, Parthasarathi Das
A cobalt-catalyzed proton-coupled electron transfer (PCET) mediated regioselective ortho-specific nitration of aromatic C(sp2)-H bonds using chelation assisted removable vicinal diamine directing groups has been developed. The reaction proceeded under mild conditions in the presence of Co(OAc)2•4H2O as the catalyst and AgNO2 utilized as nitro source as well as terminal oxidant in the presence of O2 as a external oxidant, no external base and additives were required for this process. By doing controlled experiments and mechanistic investigations with DFT calculations revealed that the reaction proceeds through PCET promoted nitro functional group transfer pathway...
June 21, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28636162/cobalt-catalyzed-ortho-c-h-functionalization-alkyne-annulation-of-benzylamine-derivatives-access-to-dihydroisoquinolines
#12
Angel Manu Martínez, Nuria Rodríguez, Ramon Gomez-Arrayas, Juan C Carretero
A practical picolinamide-directed C-H functionalization/alkyne annulation of benzylamine derivatives enabling the access to the previously elusive 1,4-dihydroisoquinoline skeleton was developed using molecular O2 as the sole oxidant and Co(OAc)2 as precatalyst. The method is compatible with both internal and terminal alkynes and shows high versatility and functional-group tolerance. Furthermore, full preservation of enantiopurity is observed when using non-racemic alpha-substituted benzylamine derivatives...
June 21, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28632453/survey-of-polychlorinated-dibenzo-p-dioxins-polychlorinated-dibenzofurans-and-non-ortho-polychlorinated-biphenyls-in-u-s-meat-and-poultry-from-2012-2013-toxic-equivalency-levels-patterns-temporal-trends-and-implications
#13
Sara J Lupton, Margaret O'Keefe, Jorge G Muñiz-Ortiz, Nelson Clinch, Pat Basu
The U.S. Department of Agriculture (USDA) conducts a statistically-based survey of the domestic meat supply (beef, pork, chicken, and turkey) to determine current levels of polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), and non-ortho-polychlorinated biphenyls (no-PCBs) every five years. Fat samples for each slaughter class were collected from U.S. federally licensed slaughter facilities. The samples were processed and analyzed for 17 PCDD/Fs and 3 no-PCBs. The sum of PCDD, PCDF, and no-PCB toxic equivalencies (sum-TEQ) calculated using 2005 toxic equivalency factors for all slaughter classes, ranged from non-detect (nd) to 6...
June 20, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28631285/quality-assurance-of-falls-reduction-in-an-orthopaedic-ward-using-a-novel-bedside-trolley-table-set-up-strategy
#14
Shuang Quan Chan, Marianne Wadsley, Sue Ferriere
OBJECTIVE: To assess whether a novel bedside trolley table set-up decreased inpatient falls (IF) postintervention. METHODS: From December 2012 to December 2014, geriatric patients admitted to our orthopaedic ward with extreme falls risk had a bedside trolley placed between them and a floor sensor mat to give responders more time to prevent IF. Pre- and postintervention falls data was reviewed for falls reduction using falls per month as comparison standard. IF were classified as high or low/medium risk using St Thomas's Risk Assessment Tool In Falling Elderly inpatients (STRATIFY) scoring...
June 20, 2017: Australasian Journal on Ageing
https://www.readbyqxmd.com/read/28629630/design-synthesis-and-tumor-cell-growth-inhibitory-activity-of-3-nitro-2h-cheromene-derivatives-as-histone-deacetylaes-inhibitors
#15
Shuai Tan, Feng He, Tingting Kong, Jingde Wu, Zhaopeng Liu
As a continuous research for the discovery of coumarin-based targeted anticancer agents, we designed and synthesized a series of novel histone deacetylases (HDAC) inhibitors using the 8-ethoxy-3-nitro-2H-chromene as the surface binding or cap group, linear dicarboxylic acid or ω-amino acid moiety with different length as the linking motif, ortho-aminoanilides, amides or α-aminoamides as the zinc binding group and the internal cavity motifs. Most of these 3-nitro-2H-chromene derivatives exhibited good growth inhibitory activity against K562, A549, MCF-7, PC3 and Hela cells and were more potent than the reference drug SAHA and MS-275...
June 1, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28627513/a-bioinspired-and-biocompatible-ortho-sulfiliminyl-phenol-synthesis
#16
Feng Xiong, Liang Lu, Tian-Yu Sun, Qian Wu, Dingyuan Yan, Ying Chen, Xinhao Zhang, Wei Wei, Yi Lu, Wei-Yin Sun, Jie Jack Li, Jing Zhao
Synthetic methods inspired by Nature often offer unique advantages including mild conditions and biocompatibility with aqueous media. Inspired by an ergothioneine biosynthesis protein EgtB, a mononuclear non-haem iron enzyme capable of catalysing the C-S bond formation and sulfoxidation, herein, we discovered a mild and metal-free C-H sulfenylation/intramolecular rearrangement cascade reaction employing an internally oxidizing O-N bond as a directing group. Our strategy accommodates a variety of oxyamines with good site selectivity and intrinsic oxidative properties...
June 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/28624811/altered-erythropoiesis-and-decreased-number-of-erythrocytes-in-children-with-neuroblastoma
#17
Fabio Morandi, Sebastiano Barco, Sara Stigliani, Michela Croce, Luca Persico, Corrado Lagazio, Francesca Scuderi, Maria Luisa Belli, Mariapina Montera, Giuliana Cangemi, Sarah Pozzi, Valentina Rigo, Paola Scaruffi, Loredana Amoroso, Giovanni Erminio, Vito Pistoia, Silvano Ferrini, Maria Valeria Corrias
Neuroblastoma (NB) is a pediatric tumor presenting at diagnosis either as localized or metastatic disease, which mainly involves the bone marrow (BM). The physical occupancy of BM space by metastatic NB cells has been held responsible for impairment of BM function. Here, we investigated whether localized or metastatic NB may alter hematopoietic lineages' maturation and release of mature cells in the periphery, through gene expression profiling, analysis of BM smears, cell blood count and flow cytometry analysis...
May 30, 2017: Oncotarget
https://www.readbyqxmd.com/read/28621913/visible-light-promoted-generation-of-alpha-ketoradicals-from-vinyl-bromides-and-molecular-oxygen-synthesis-of-indenones-and-dihydroindeno-1-2-c-chromenes
#18
Santosh K Pagire, Peter Kreitmeuer, Oliver Reiser
Ortho-alkynylated α-bromocinnamates can be converted by a visible light mediated photocascade reaction with molecular oxygen either to indenones or to dihydroindeno[1,2-c]chromenes. The one-step process features two photochemical key steps, i.e. the activation of vinyl bromides by energy transfer giving rise to α-ketoradicals in the reaction with molecular oxygen and the α-hydroxylation of an arene moiety.
June 16, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28618360/the-distribution-of-phosphorus-and-its-transformations-during-batch-growth-of-synechocystis
#19
Yun Zhou, Binh T Nguyen, Chen Zhou, Levi Straka, YenJung Sean Lai, Siqing Xia, Bruce E Rittmann
Phosphorus (P) is an essential nutrient that affects the growth and metabolism of microalgal biomass. Despite the obvious importance of P, the dynamics of how it is taken up and distributed in microalgae are largely undefined. In this study, we tracked the fate of P during batch growth of the cyanobacterium Synechocystis sp. PCC 6803. We determined the distribution of P in intracellular polymeric substances (IPS), extracellular polymeric substances (EPS), and soluble microbial products (SMP) for three initial ortho-phosphate concentrations...
June 9, 2017: Water Research
https://www.readbyqxmd.com/read/28618154/catalytic-enantioselective-aza-pinacol-rearrangement
#20
Yuanyuan Yu, Jingwen Li, Long Jiang, Jing-Ren Zhang, Liansuo Zu
The first catalytic enantioselective asymmetric aza-pinacol rearrangement is reported. The reactions are catalyzed by a chiral phosphoric acid through a highly-organized transition state involving a cyclic aza-ortho-xylylene intermediate to afford the indoline structures with good to excellent enantioselectivities. The synthetic utility has been demonstrated by the asymmetric synthesis of a key intermediate to natural product minfiensine and the identification of a chiral lead compound to repress antibiotic resistance...
June 15, 2017: Angewandte Chemie
keyword
keyword
2761
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"