Search results for "AlON"

{[Cu(H2O)3][Cu(phmal)2]}n: a new two-dimensional copper(ii) complex with intralayer ferromagnetic interactions (phmal = phenylmalonate dianion)

2003

The novel sheet-like copper(II) compound of formula {[Cu(H2O)3][Cu(Phmal)2]}n (1) (Phmal = dianion of phenylmalonic acid) has been synthesized and its crystal structure determined by X-ray diffraction. The structure of 1 consists of 21 chains of carboxylate(phenylmalonate)-bridged copper(II) ions which are linked through double μ-oxo(carboxylate) units to afford a two-dimensional network. The interlayer space is filled by the phenyl rings of the phenylmalonate ligands that exhibit offset face-to-face interactions. Variable-temperature magnetic measurements of 1 show the occurrence of significant intralayer ferromagnetic interactions between the copper(II) ions through anti–syn carboxylate- …

Lanthanum-pyBOX complexes as catalysts for the enantioselective conjugate addition of malonate esters to β,γ-unsaturated α-ketimino esters

2018

[EN] In this paper, we report the application of chiral complexes of La(III) with pyBOX ligands as Lewis acid catalysts in the conjugate addition of malonic esters to N-tosyl imines derived from ß,gamma-unsaturated alfa-keto esters to give the corresponding chiral alfa,ß-dehydroamino esters. pyBOX complexes with La(III), Yb(III), Sc(III), and In(III) triflates were assessed in this reaction but only La(III) showed good activity and enantioselectivity, while Yb(III) provided the expected product with low yield and stereoselectivity, and the Sc(III) and In(III) complexes were completely inactive. The complex of La(OTf)3 with the diphenyl-pyBOX ligand prepared in situ provided the best results…

Catalytic Asymmetric Formal [3+2] Cycloaddition of 2-Isocyanatomalonate Esters and Unsaturated Imines: Synthesis of Highly Substituted Chiral γ-Lacta…

2017

[EN] Unlike their isocyano and isothiocyanato analogues, isocyanato esters remain almost unexplored as formal 1,3-dipoles in asymmetric catalytic reactions. The first asymmetric formal [3+2] cycloaddition involving isocyanato esters and electrophilic alkenes is reported. Diisopropyl 2-isocyanatomalonate reacts with a,b-unsaturated N-(o-anisidyl) imines in the presence of a Mg(OTf)2¿BOX complex to give highly substituted chiral pyrrolidinones featuring a conjugate exocyclic double bond with excellent yields and enantiomeric excesses up to 99%. Several transformations of the resulting heterocycles, including the synthesis of a pyroglutamic acid derivative, have been carried out.

Chronic fluoxetine treatment in middle-aged rats induces changes in the expression of plasticity-related molecules and in neurogenesis

2012

Abstract Background Antidepressants promote neuronal structural plasticity in young-adult rodents, but little is known of their effects on older animals. The polysialylated form of the neural cell adhesion molecule (PSA-NCAM) may mediate these structural changes through its anti-adhesive properties. PSA-NCAM is expressed in immature neurons and in a subpopulation of mature interneurons and its expression is modulated by antidepressants in the telencephalon of young-adult rodents. Results We have analyzed the effects of 14 days of fluoxetine treatment on the density of puncta expressing PSA-NCAM and different presynaptic markers in the medial prefrontal cortex, hippocampus and amygdala of mi…

Influence of the quadratic term in the alongwind stochastic response of SDOF structures

1996

A parametric study, regarding the influence of the quadratic pressure term, which is often neglected in the literature, on the stochastic alongwind response of a single-degree-of-freedom (SDOF) structure subjected to wind action, is presented. The results are reported in terms of percentages of difference in the evaluation of the response, by considering and neglecting the quadratic pressure term. The changing parameters considered are: the terrain drag coefficient, the structure height, the structure natural radian frequency, the structure damping coefficient and the wind reference mean velocity. The response stochastic analysis has been carried out in the time domain, by means of the mome…

Combined pharmacological treatment of heterozygous familial hypercholesterolemia

1990

Combined therapy of heterozygous familial hypercholesterolemia using a non-systemically acting drug (bile acid sequestrants) and a systemically acting one is frequently employed in clinical practice. A brief review of this topic is presented, with particular emphasis on the use of cholestyramine combined with pravastatin, a new HMG CoA reductase inhibitor.

Interrogation sur la nature et la formation des grandeurs économiques : la question de la valeur et de la mesure en économie

2016

To investigate on the question of the formation of the economic magnitudes, and on the question of value seems to be pointless, since those notions appear to be understood and to fall under the scope of our daily experiment. We show in the present work that several fundamental concepts and central notions do not receive a proper definition within our discipline. As a consequence, it is all the economic discourse that is weakened, at such a point that it talks about things that, actually, do not exist, but in the economist’s mind, and do not consider its true matter. In our wage economy, value is sometimes created sometimes destructed respectively in the formation and the destruction of inco…

LACTATE DEHYDROGENASE ISOENZYMES IN THE NERVOUS TISSUE. IV. AN ONTOGENETIC STUDY ON THE RAT BRAIN.

1964

Regional Ambassadors or State Agents? Assessing the Role of Catalan Cabinet Ministers in Spain

2022

Identificador de proyecto: UPO-FEDER (grant number UPO-1380883)

«Una pintura que se contiene en un pliego grande». El tablero de la Filosofía cortesana de Alonso de Barros: una Oca emblemática entre España e Itali…

2010

Se aborda en este trabajo el estudio de la ilustración del juego de la Filosofía cortesana que acompañaba la edición de Madrid, 1587 y que hoy no se conoce, aunque se ha descubierto recientemente el tablero del juego de la edición de Venencia, 1588; se incluye un estado crítico de la cuestión y la aportación de una carta que documenta el conocimiento del Juego de la Oca en los años anteriores a la impresión de la obra de Barros. This article studies the illustrations of the game of Filosofía cortesana (Courtly philosophy) accompanying the 1587 Madrid edition. The existence of these images was not heretofore known, although a 1588 Venice edition has recently been discovered with a representa…