Search results for "Michael"

Triazolopyridines. Part 11. Ylides derived from 2-Acylmethyltriazolopyridinium salts.

1991

Abstract Ylides derived from 2-acylmethyltriazolopyridinium salts (2a) -(2c) react with methyl or ethyl propiolate and with dimethyl acetylenedicarboxylate to give ylides (3a)–(3e), (6) or (7). In some cases 1:2 adducts are formed, shown to be the novel ylides (8a)–(8d); an X-ray diffraction confirms structure (8a).

Theoretical Study of the Reaction of Dimethyl Acetylenedicarboxylate with 1-Methyl-2-(1-substituted vinyl)pyrroles

1995

Abstract A theoretical study of the transition structure for the electrophilic attack step of the 1-methyl-2-vinylpyrrole to dimethyl acetylenedicarboxylate is reported with analytical gradients at AM1 and PM3 semi-empirical levels and ab initio at 3-21G level. The geometry, electronic structure, and vector components are qualitatively computer level and model independent The competition of the Michael addition reactions and Diels-Alder reactions of 1-methyl-2-(1-substituted vinyl)pyrroles with dimethyl acetylenedicarboxylate has been studied at the PM3 semi-empirical level.

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…

“Come, Dark-eyed Sleep”: Michael Field and the Performance of the Lyric as a Radical Fantasy

2021

This article seeks to illustrate how the Michael Fields articulate their Sapphic poetry in Long Ago (1889) not only in keeping with their own Shakespearean aspirations and with Robert Browning’s hybrid formula of dramatic lyrics, but also in connection with Jonathan Culler’s theory of the lyric as a performative genre. Much recent scholarship has broken ground in the rediscovery and reappraisal of the Fields’ literary stature, yet the general critical approach has been divisive in addressing their poetry and their verse dramas separately. Some critics have taken heed of how their lyrics in general exhibit an intrinsic dramatic temper, yet no systematic inquiry has discussed how this lyrical…

Foucault, pastoral power, and optics

2015

The article shows that in Foucault’s late 1970s and early 1980s analyses of pastoral, conductive power—most essentially in early and medieval Christianity—the issue of sight and visual perception recurs and occupies a crucial status. In Foucault’s discussion, these Christian relations of power, knowledge, and truth are attached with a surveying gaze that is both totalizing as well as individualizing, one that is mobilized by the thrust towards perfect visibility, transparency, and illumination of the subject turned into an object. The intention is also to develop Foucault’s analysis further, by demonstrating how Christian, providential government can be and actually has been detached from …

No nos callarán

2004

Two Decades of Progress in the Asymmetric Intramolecular aza-Michael Reaction.

2021

The asymmetric intramolecular aza-Michael reaction (IMAMR) is a very convenient strategy for the generation of heterocycles bearing nitrogen-substituted stereocenters. Due to the ubiquitous presence of these skeletons in natural products, the IMAMR has found widespread applications in the total synthesis of alkaloids and biologically relevant compounds. The development of asymmetric versions of the IMAMR are quite recent, most of them reported in this century. The fundamental advances in this field involve the use of organocatalysts. Chiral imidazolidinones, diaryl prolinol derivatives, Cinchone-derived primary amines and quaternary ammonium salts, and BINOL-derived phosphoric acids account…

Recensione. Michael Quante, Il concetto hegeliano di azione, Franco Angeli, Milano 2011, pp. 224

2011

The Military Policy of Isaac Komnenos at the time of battle of Petroe (1057)

2018

AbstractIsaac Komnenos (1007-1060) was the son of Manuel Eroticos Komnenos (955/960-c.1020), one of the associates of Basil II. Thanks to his education, Isaac later joined the imperial army (around 1042). He held the post of stratopedarches of the East and the ranks of magistros. At Easter 1057, the delegation of many military commanders presented itself before the emperor. This delegation was led by Isaac, and along with Katakalon Kekaumenos he tried to convince Michael VI to give them both the title of proedros, but the new emperor rejected their demands. They did not receive the money they counted on the part of the emperor, and he insulted them. This, in turn, became the causative facto…

La influencia de los textos sagrados en la configuración visual de los santos guerreros

2020

espanolEl presente articulo analiza los convencionalismos y recursos visuales utilizados en las leyendas de santos guerreros, basados en las fuentes del Antiguo y el Nuevo Testamento con la finalidad de ofrecer una mayor comprension del fenomeno de la sacralizacion de la guerra y la funcion de las imagenes de santos caballeros en el ambito hispanico. Son numerosos los ejemplos en los que los santos guerreros aparecen reiteradamente amparando a los ejercitos cristianos o destrozando a las huestes enemigas. En muchos de estos casos, algunos de los elementos significantes utilizados presentan una evidente asociacion con las grandes gestas del Antiguo Testamento, conformandose como recurrentes …