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organo donor

Marialuisa Aufiero, Ryan Gilmour
The axioms of stereoelectronic theory constitute an atlas to navigate the contours of molecular space. All too rarely lauded, the advent and development of stereoelectronic theory has been one of organic chemistry's greatest triumphs. Inevitably, however, in the absence of a comprehensive treatise, many of the field's pioneers do not receive the veneration that they merit. Rather their legacies are the stereoelectronic pillars that persist in teaching and research. This ubiquity continues to afford practitioners of organic chemistry with an abundance of opportunities for creative endeavor in reaction design, in conceiving novel activation modes, in preorganizing intermediates, or in stabilizing productive transition states and products...
June 12, 2018: Accounts of Chemical Research
A Ríos, A I López-Navas, C De-Francisco, Á Sánchez, A M Hernández, P Ramírez, P Parrilla
INTRODUCTION: Most psychosocial attitude studies for donors are not evaluated and are not valid. Validated questionnaires are necessary to compare results and guarantee that they measure what they are intended to measure. OBJECTIVE: To analyze the psychometric characteristics of the attitude questionnaire toward the donation of one's own organs after death. We evaluated PCID-DTO RIOS (Questionnaire of "Proyecto Colaborativo Internacional Donante" about organ donation and transplant; donación y trasplante de órganos in Spanish), developed by Dr Ríos, for its validation in a Spanish-speaking population...
March 2018: Transplantation Proceedings
Carlo Mealli, Andrea Ienco, Maurizio Peruzzini, Gabriele Manca
A detailed mechanism of the I2 -induced transformation of white phosphorus into PI3 emerges from a DFT analysis. This multi-step process implies that at any stage one P-P and two I-I bonds cleavages, associated with the formation of two P-I bonds plus an in situ generated brand new I2 molecule. Significant electron transfer between the atoms is observed at any step, but the reactions are better defined as concerted rather than redox. Along the steepest descent to the product, no significant barrier is encountered except for the very first P4 activation, which costs +14...
January 2, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Dominic Auerhammer, Merle Arrowsmith, Holger Braunschweig, Rian D Dewhurst, J Oscar C Jiménez-Halla, Thomas Kupfer
The reaction of [(cAACMe )BH3 ] (cAACMe = 1-(2,6-i Pr2 C6 H3 )-3,3,5,5-tetramethylpyrrolidin-2-ylidene) with a range of organolithium compounds led to the exclusive formation of the corresponding (dihydro)organoborates, Li+ [(cAACMe H)BH2 R]- (R = sp3 -, sp2 -, or sp-hybridised organic substituent), by migration of one boron-bound hydrogen atom to the adjacent carbene carbon of the cAAC ligand. A subsequent deprotonation/salt metathesis reaction with Me3 SiCl or spontaneous LiH elimination yielded the neutral cAAC-supported mono(organo)boranes, [(cAACMe )BH2 R]...
October 1, 2017: Chemical Science
Érika Fernanda Dos Santos Bezerra Ludwig, Marta Cristiane Alves Pereira, Yolanda Dora Évora Martinez, Karina Dal Sasso Mendes, Mariana Angela Rossaneis
Objective: to develop a prototype of a computerized scale for the active search for potential organ and tissue donors. Method: methodological study, with the analysis of 377 electronic medical records of patients who died due to encephalic death or cardiorespiratory arrest in the intensive care units of a tertiary hospital. Among the deaths due to cardiorespiratory arrest, the study aimed to identify factors indicating underreported encephalic death cases. The Acute Physiology and Chronic Health Evaluation II and Sepsis Related Organ Failure Assessment severity indexes were applied in the protocols...
September 12, 2017: Revista Latino-americana de Enfermagem
Aboma Merdasa, Yuxi Tian, Rafael Camacho, Alexander Dobrovolsky, Elke Debroye, Eva L Unger, Johan Hofkens, Villy Sundström, Ivan G Scheblykin
Organo-metal halide perovskites are some of the most promising materials for the new generation of low-cost photovoltaic and light-emitting devices. Their solution processability is a beneficial trait, although it leads to a spatial inhomogeneity of perovskite films with a variation of the trap state density at the nanoscale. Comprehending their properties using traditional spectroscopy therefore becomes difficult, calling for a combination with microscopy in order to see beyond the ensemble-averaged response...
June 27, 2017: ACS Nano
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...
December 20, 2016: Organic & Biomolecular Chemistry
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
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.]
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
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
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
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
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
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
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
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
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
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
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
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