Search results for "Crafts"
showing 10 items of 101 documents
Catalytic Enantioselective Friedel–Crafts Reactions of Naphthols and Electron-Rich Phenols
2016
The enantioselective Friedel–Crafts reaction is a powerful tool for the construction of benzylic stereocenters in a stereodefined manner. Significant advances have already been achieved with heteroarenes such as indoles and pyrroles; however, the reaction with homoarenes is less developed. This short review covers the most relevant literature on enantioselective Friedel–Crafts reactions with naphthols and phenols. 1 Introduction 2 Friedel–Crafts Reactions Involving 1,2-Nucleophilic Addition to C=X Bonds 3 Friedel–Crafts Reactions Involving Conjugate Nucleophilic Addition to Electrophilic C=C Bonds 4 Friedel–Crafts Reactions Involving π-Allylic Complexes as Electrophiles 5 ipso-Friedel–Craft…
Characterization of some isomeric benzophenones by their mass spectra
1979
Benzophenones have been described to undergo characteristic α-cleavage and rearrangement processes upon mass spectrometric fragmentation. Recently two series of new and isomeric benzophenones have been prepared from phenylbenzoates by Fries rearrangement or directly by Friedel Crafts acylation. It is shown that the above mentioned diagnostic fragmentation processes can be used to characterize the resulting isomeric ortho or para hydroxy and ortho or para methoxy benzophenones unambigously.
Synthesis of Functionalized Indoles with a Trifluoromethy-Substituted Stereogenic Tertiary Carbon Atom Through an Enantioselective Friedel-Crafts Alk…
2010
[EN] Chiral complexes of BINOL-based ligands with zirconium tert-butoxide catalyze the Friedel-Crafts alkylation reaction of indoles with beta-trifluoromethyl-alpha,beta-unsaturated ketones to give functionalized indoles with an asymmetric tertiary carbon center attached to a trifluoromethyl group. The reaction can be applied to a large number of substituted alpha-trifluoromethyl enones and substituted indoles. The expected products were obtained with good yields and ees of up to 99%.
Artigianato e Design. Antiche tradizioni e nuove opportunità
2018
Il forte interesse intorno alle arti applicate, che si registra in continua crescita, testimoniato da una rinnovata attenzione di alcune istituzioni e il fiorire di associazioni, di gruppi di lavoro, cooperative e varie aggregazioni finalizzate a ridare valore ed importanza alla cultura del fare, fanno ben sperare per il futuro. Questo rinnovato interesse verso la cultura del fare conferma che siamo di fronte ad un vero fenomeno nuovo e ad una attenzione da parte del designer verso l’arte, verso le nuove materie, verso le nuove tecniche -povere o ricche che siano - verso i sistemi di autoproduzione. Se prima il design doveva rispondere alla necessità sociale di avere prodotti di serie, este…
The black female slave takes literary revenge: Female gothic motifs against slavery in Hannah Crafts’s "The Bondwoman’s Narrative"
2015
The Bondwoman’s Narrative is a novel that functions as a story made up from Hannah Crafts’s experiences as a bondwoman and thus merges fact and fiction giving a thoroughly new account of slavery both committed to reality and fiction. Following and taking over the Gothic literary genre that spread in Europe as a reaction toward the Romantic spirit, Crafts uses it to denounce the degrading slavery system and, mainly, to scathingly attack the patriarchal roots that stigmatize black women as the ultimate victims. It is my contention that Hannah Crafts uses the female Gothic literary devices both to attack slavery and also to stand as a proper (African) American citizen capable of relating to th…
Iminium Catalysis (n → π*)
2016
Catalytic Asymmetric Friedel–Crafts Alkylations in Total Synthesis
2009
La funzione tecnica e il mestiere dell'artigiano nella Grecia antica tra merito e responsabilità. Una rassegna critica
2017
This paper is a critical essay on the social value of craftsmen in ancient Greece as well of the merit and ethic responsibility connected to the social use of their skills and forms of knowledge, the so-called technai. On one hand a low grade of social consideration was attributed to craftsmen, especially among the upper classes in the Greek cities; on the other hand, craft and technical skills were an essential medium for all the material products and commodities to be supplied for the citizens. The origins of this ambiguous relationship between society and technical skills seem to lie in the particular social and political conditions of Greek craftsmen, mostly foreign people at the dispos…
NUOVI TERRITORI DEL DESIGN TRA ARTIGIANATO E LUOGHI STORICI DELLA CITTÀ _ NEW TERRITORIES OF DESIGN BETWEEN ARTISAN HERITAGE AND HISTORICAL SITES OF …
2017
La riscoperta del lavoro artigiano supera i confini dell’economia e ci invita a riflettere su cosa può essere oggi la creatività. Nel prossimo decennio, gli innovatori più brillanti non dovranno più affidare ad altri la realizzazione delle loro idee, ma potranno produrre e distribuire da soli, sfruttando web e nuove tecnologie. Il progetto CREZI_FOOD_KIT si muove all’interno di questo sistema. Coinvolge il Centro Storico di Palermo partendo dal cibo e prova a creare una filiera i cui prodotti si sostengono a vicenda alla ricerca di una nuova via in cui tradizione e innovazione camminano fianco a fianco. The rediscovery of craftsmanship transcends the boundaries of economy and invites us to …
Enantioselective Friedel-Crafts reaction of hydroxyarenes with nitroenynes to access chiral heterocycles via sequential catalysis
2021
Naphthols, hydroxyindoles and an activated phenol are reacted with differently substituted (E)-nitrobut-1-en-3-ynes using the commercially available Rawal's chiral squaramide. The corresponding β-nitroalkynes were obtained with good yields and excellent enantioselectivities. Moreover, dihydronaphthofurans can be accessed via silver catalysed cyclization in a tandem one-pot procedure, with high preservation of the optical purity.