Search results for "C-H"
showing 10 items of 82 documents
Soil erosion modelling: a global review and statistical analysis
2021
40 Pags.- 10 Figs.- 2 Tabls.- Suppl. Informat. The definitive version is available at: https://www.sciencedirect.com/science/journal/00489697
Sichelgaita di Salerno, principessa longobarda, nei «Gesta Roberti Wiscardi» di Guglielmo il Pugliese
2020
L’articolo è dedicato alla raffigurazione della principessa longobarda Sichelgaita di Salerno, seconda moglie di Roberto il Guiscardo, nei «Gesta Roberti Wiscardi» di Guglielmo il Pugliese, l’unico poema epico-storico dei secc. XI-XII che tratti della conquista normanna dell’Italia meridionale. In questa nota, Sichelgaita viene presentata attraverso il suo profilo storico e biografico e alla luce della disamina di alcuni passi del poema (in particolare, II 416-443). This paper is devoted to the figure of Robert Guiscard’s second wife, the Lombard princess Sichelgaita of Salerno, in William of Puglia’s «Gesta Roberti Wiscardi», the only epic-historical poem of XIth-XIIth centuries that deals…
Dibenzocycloheptatriene as end-group of Thiele and tetrabenzo-Chichibabin hydrocarbons
2020
The authors are grateful for the financial support from: MICIU/FEDER/AEI, Spain (PG2018-101181-B-I00, PGC2018-095808B-I00, MAT2016-80826-R, FIP-2018-HECTIC-PTM, Prometeo2019/076 and the "Severo Ochoa" Programme for Centres of Excellence in R & D; SEV-2015-0496), the European Research Council (ERC) (677023), DGR (Catalunya) (2017-SGR-918), and SNSF (Switzerland, TS., PZ00P2_174175). We thank the CSIRC-Alhambra and SciCore (Basel, Switzerland) for supercomputing facilities and the Servei de RMN, UAB, for instrument time.
CCDC 182937: Experimental Crystal Structure Determination
2003
Related Article: R.Lescouezec, J.Vaissermann, F.Lloret, M.Julve, M.Verdaguer|2002|Inorg.Chem.|41|5943|doi:10.1021/ic020374o
CCDC 196445: Experimental Crystal Structure Determination
2003
Related Article: C.P.Berlinguette, D.Vaughn, C.Canada-Vilalta, J.R.Galan-Mascaros, K.R.Dunbar|2003|Angew.Chem.,Int.Ed.|42|1523|doi:10.1002/anie.200250479
Insertion Reactions of Neutral Phosphidozirconocene Complexes as a Convenient Entry into Frustrated Lewis Pair Territory
2016
International audience; Neutral phosphidozirconocene complexes [Cp2Zr(PR2)Me] (Cp=cyclopentadienyl; 1a: R=cyclohexyl (Cy); 1b: R=mesityl (Mes); 1c: R=tBu) undergo insertion into the Zr-P bond by non-enolisable carbonyl building blocks (O=CRR), such as benzophenone, aldehydes, paraformaldehyde or CO2, to give [Cp2Zr(OCRRPR2)Me] (3-7). Depending on the steric bulk around P, complexes 3-7 react with B(C6F5)(3) to give O-bridged cationic zirconocene dimers that display typical frustrated Lewis pair (FLP)/ambiphilic ligand behaviour. Thus, the reaction of {[Cp2Zr(-OCHPhPCy2)][MeB(C6F5)(3)]}(2) (10a) with chalcone results in 1,4 addition of the Zr+/P FLP, whereas the reaction of {[Cp2Zr(-OCHFcPCy…
Unique distal size selectivity with a digold catalyst during alkyne homocoupling
2015
Metal-catalysed chemical reactions are often controlled by steric hindrance around the metal atom and it is rare that substituents far away of the reaction site could be differentiated during reaction, particularly if they are simple alkyl groups. Here we show that a gold catalyst is able to discriminate between linear carbon alkynes with 10 or 12 atoms in the chain during the oxidative homocoupling of alkynes: the former is fully reactive and the latter is practically unreactive. We present experimental evidences, which support that the distal size selectivity occurs by the impossibility of transmetallating two long alkyl chains in an A-framed, mixed-valence digold (I, III) acetylide compl…
Triggering the generation of an iron(IV)-oxo compound and its reactivity toward sulfides by RuII photocatalysis
2014
The preparation of [FeIV(O)(MePy2tacn)]2+ (2, MePy2tacn = N-methyl-N,N-bis(2-picolyl)-1,4,7-triazacyclononane) by reaction of [FeII(MePy2tacn)(solvent)]2+ (1) and PhIO in CH3CN and its full characterization are described. This compound can also be prepared photochemically from its iron(II) precursor by irradiation at 447 nm in the presence of catalytic amounts of [Ru II(bpy)3]2+ as photosensitizer and a sacrificial electron acceptor (Na2S2O8). Remarkably, the rate of the reaction of the photochemically prepared compound 2 toward sulfides increases 150-fold under irradiation, and 2 is partially regenerated after the sulfide has been consumed; hence, the process can be repeated several times.…
Mapping 123 million neonatal, infant and child deaths between 2000 and 2017
2019
Since 2000, many countries have achieved considerable success in improving child survival, but localized progress remains unclear. To inform efforts towards United Nations Sustainable Development Goal 3.2—to end preventable child deaths by 2030—we need consistently estimated data at the subnational level regarding child mortality rates and trends. Here we quantified, for the period 2000–2017, the subnational variation in mortality rates and number of deaths of neonates, infants and children under 5 years of age within 99 low- and middle-income countries using a geostatistical survival model. We estimated that 32% of children under 5 in these countries lived in districts that had attained ra…
Jaunu tetratiafulvalēnu atvasinājumu sintēze
2019
Jaunu tetratiafulvalēnu atvasinājumu sintēze. Karpicka D., zinātniskais vadītājs Dr. Chem. Šubins K. Bakalaura darbs, 44 lappuses, 34 attēli, 3 tabulas, 36 literatūras avoti, 1 pielikumi. Latviešu valodā. Literatūras apskatā ir apkopota informācija par tetratiafulvalēnu atvasinājumu sintēzi, izmantojot palādija katalizētas šķērssametināšanas reakcijas, reakciju mehānismiem un visbiežāk izmantotiem reaģentiem. Bakalaura darbs ir veltīts jaunu tetratiafulvalēna atvasinājumu iegūšanai. Ir aprakstīti sintēžu mēginājumi un galvenās problēmas to veikšanā.