Structurally defined zincated and aluminated complexes of ferrocene made by alkali-metal-synergistic syntheses

Reaction of ferrocene with 1 or 2 molar equiv of the synergistic-operative bimetallic sodium zincate base TMEDA·Na(μ-TMP)(μ-tBu)Zn(tBu) yields mainly mono- or dizincated complexes TMEDA·Na(μ-TMP)[μ-(C5H4)Fe(C5H5)]ZntBu (1) and [TMEDA·Na(μ-TMP)Zn(tBu)]2(C5H4)2Fe (2). Likewise, the separated pairing of Li(TMP) and (TMP)AliBu2 in the presence of THF can mono- or dimetalate ferrocene in a synergistic two-step lithiation/trans-metal-trapping protocol to give THF·Li(μ-TMP)[μ-(C5H4)Fe(C5H5)]Al(iBu)2 (4) or [THF·Li(μ-TMP)Al(iBu)2]2(C5H4)2Fe (5). In the absence of Lewis donating cosolvents, a 4-fold excess of the sodium zincate appears to produce an unprecedented 4-fold zincated ferrocene of formula Na4(TMP)4Zn4(tBu)4[(C5H3)2Fe] (3), whereas when donor solvent is withheld from the lithium/aluminum pairing, only dimetalation of ferrocene is possible. Tetrametalation seems to be inhibited by the in situ generation of TMP(H) via amido basicity, which then acts as a Lewis donor toward lithium, preventing inverse-crown formation and preferentially forming the Lewis acid–Lewis base adduct [TMP(H)·Li(μ-TMP)Al(iBu)2]2(C5H4)2Fe (6). With the exception of 3, all aforementioned complexes have been characterized by X-ray crystallography, while 1–6 have also been studied by solution NMR spectroscopic studies

(Re)thinking culture and education within the work context: trends, perspectives and possibilities of articulation

Contrariando as tendências mais recentes que teimam em estabelecer relações lineares e unidireccionais entre as problemáticas da cultura e da formação em contexto de trabalho, propomos neste artigo um raciocínio invertido assente na discussão das mútuas imbricações entre estes dois campos do saber, designadamente a problematização das múltiplas formas e processos de formação por referência às especificidades culturais e simbólicas das organizações de trabalho. Para ilustrar a pertinência desta proposta recorremos a um conjunto de dados empíricos que recolhemos num dos seis estudos de caso desenvolvidos no âmbito de um projecto de investigação transnacional, submetendo este corpus empírico a uma análise interpretativa e a um confronto com as nossas hipóteses teóricas.Contrary to the latest trends, which insist on establishing linear and unidirectional relationships between the problematics of culture and workplace education, this work proposes an inverted reasoning based on the discussion of mutual imbrications between these two fields of knowledge, namely, the problematization of the multiple education forms and procedures with reference to the cultural and symbolic specificities of the organizations of work. To illustrate the relevance of this proposal, the author employs a set of empirical data collected in one of the six case studies developed as part of a transnational research project, subjecting this empirical corpus to an interpretative analysis and a confrontation with his own theoretical assumptions.(undefined)info:eu-repo/semantics/publishedVersio