Conducting olefin metathesis reactions in air : breaking the paradigm

The authors gratefully acknowledge the Royal Society (University Research Fellowship to CSJC) and the EC (CP-FP 211468-2 EUMET) for funding.The first study of low catalyst loading olefin metathesis reactions in air is reported. TON values of up to 7000 were obtained using non-degassed solvents with commercially available pre-catalysts Caz-1, Hov-II and Ind-II. The simple experimental conditions allow olefin metathesis reactions to be carried out on the benchtop using technical grade solvents in air.PostprintPeer reviewe

Editorial

A series of N-heterocyclic carbene (NHC)/PR3 palladium(II) and palladium(0) complexes has been synthesized and fully characterized. X-ray crystallographic data have allowed comparison of ligand steric properties. The NHC ligand was found to vary its steric properties as a function of the phosphine co-ligand. These complexes display interesting catalytic properties in the Suzuki-Miyaura reaction performed in aqueous media. The pre-catalyst [PdCl2(IPr)(XPhos)] (IPr = N,N'-bis-(2,6-diisopropylphenyl)imidazol-2-ylidene; XPhos = 2-dicyclohexylphosphino-2',4',6'-triisopropylbiphenyl) was found to be the most efficient system, promoting the coupling of a wide range of aryl chlorides with boronic acids in aqueous media with a typical catalyst loading of 0.03 mol%

Selective NaOH-catalysed hydration of aromatic nitriles to amides

The authors gratefully acknowledge the Royal Society (University Research Fellowship to CSJC)The selective synthesis of aromatic and heteroaromatic amides through base-catalysed hydration of nitriles was achieved using inexpensive and commercially available NaOH as the only catalyst. A wide range of nitriles was selectively converted to their corresponding amides. Kinetic studies show that the double hydration of nitriles towards undesirable carboxylic acids is negligible under our reaction conditions.PostprintPeer reviewe

CONTRIBUTION TO THE REVALUATION OF IVAN MEŠTROVIĆ ARCHITECTURAL LEGACY IN LIGHT OF MUSEOLOGICAL AND INHERITANCE CONSIDERATION

Arhitektonski opus Ivana Meštrovića u kontekstu vremena i prilika u kojima je umjetnik stvarao zasigurno je izniman doprinos hrvatskom graditeljstvu prve polovice 20. st. Njegova valorizacija višestruko je važna, osobito s muzeološkoga, stilskoga i programatskoga gledišta. U slojevitom eklekticizmu svih Meštrovićevih ostvarenih i neostvarenih arhitektonskih te urbanističkih projekata stilska raščlamba i diferencijacija svakoga pojedinog objekta i nacrta postavlja se kao nužna polazišna točka koju naknadno slijedi povijesnoumjetničko vrednovanje i muzeološke preferencije. Neosporno višejezičan vokabular Meštrovićevih arhitektonskih zamisli za sve je vrijeme njegova stvaralaštva pod kontinuiranim utjecajem različitih arhitektonskih rječnika u širokome vremenskom rasponu od starovjekovnih civilizacija do modernih tekovina. U umjetnikovu opusu mogu se posve jasno iščitati prostorne, tlocrtne, dispozicijske i pejzažne zadanosti klasičnoga arhitektonskog promišljanjaThe article analyzes the problem of the architectural legacy of Ivan Meštrović with the intention of seeing the importance of this under-examined area of his work. An analytical examination, scientific analysis and subsequent popularization of the architectural oeuvre of Ivan Meštrović and, in general, its contribution to the national and European architecture of the first half of the 20th century is important for a better scientific and museological evaluation of the architectural heritage. The architecture of Ivan Meštrović tends to be undervalued in comparison with his sculptural production. The research into and the systematic treatment and protection of the architectural monuments of this great artist can provide us with an insight into a new world of space, volume and shapes, and of design, conceptual and construction solutions. In the sea of dissimilarity, the models and various stylistic narrations reveal to us Meštrović the architect. The paper is structured in such a way that the first part refers to the artist’s education and the acquisition of basic architectural knowledge during his study in Vienna, helping him to form an architectural style of his own through the prism of the influences of various cultures and civilisations. In the second part the focus is directed at separate analysis and interpretation of designed and constructed buildings, as well as those whose ideas were not realized. Monuments are categorized into four groups according to theme and use: memorial buildings, religious buildings, creative and living spaces, public buildings. An analysis of Meštrović’s architecture reveals a pluralism of styles, within which several dominant sources stand out. Primarily these are classicism, then the medieval religious architecture of Dalmatia, Egyptian monumentalism and the influences of his many collaborators

Synthèse de b-aminoacides cycliques chiraux par réactions de Diels-Alder asymétriques

MONTPELLIER-BU Sciences (341722106) / SudocSudocFranceF

[Pd(NHC)(PR3)] complexes:versatile tools for tandem dehydrogenation-hydrogenation processes

This work is supported in part by funding from the EPSRC UKHomogeneous Pd(0) complexes are powerful tools for numerous catalytic reactions. Recent work has demonstrated the unique properties displayed by [Pd(NHC)(PR3)] catalysts in the activation of ammonia borane (AB) and formic acid, with the subsequent formation of hydrogen. An understanding of the mechanism allowed for the design of a new dehydrogenation-hydrogenation tandem process using hydrogen storage materials'. The hydrogenations of alkenes and alkynes were successfully performed at low catalyst loadings of Pd(0) species and mild conditions. Such tandem process represents a safe and innovative alternative to classic hydrogenation protocols.Publisher PDFPeer reviewe