114 research outputs found

    McEwan Colin and Leonardo López Luján (eds), Moctezuma Aztec Ruler

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    De septembre 2009 à janvier 2010, le British Museum consacrait une exposition à Moctezuma Xocoyotzin (dernier souverain élu de l’empire aztèque), bouclant ainsi un cycle de quatre expositions consacrées aux grands hommes de pouvoir de l’histoire universelle. On pouvait ainsi admirer sous la rotonde du musée un ensemble de 131 objets préhispaniques et coloniaux permettant d’examiner « la vie, le règne et la mort controversée de ce souverain pendant la conquête espagnole ». En écho à l’événemen..

    Koordinationschemie perhalogenierter Cyclopentadiene und Alkine, X

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    Coordination Chemistry of Perhalogenated Cyclopentadienes and Alkynes, X[1]. - Synthesis and Molecular Structure of a Cyclopentadienyl-1,3-dithiol Complex, [C5Cl3(SH)2]Mn(CO)3 The reaction of [C5Cl4Li]Mn(CO)3 with elemental sulfur leads to [C5Cl4SLi]Mn(CO)3 (1), which is easily oxidized by air to the disulfide (OC)3Mn[C5Cl4S-SCl4C5]Mn(CO)3 (2). Addition of one equivalent of BuLi, followed by an excess of S8 produces the dithiolate [C5Cl3(SLi)2]Mn(CO)3 (3), which yields the dithiol [C5Cl3(SH)2]Mn(CO)3 (5) upon hydrolysis. The molecular structures of 2 and 5 have been determined by X-ray diffraction

    Komplexchemie perhalogenierter Cyclopentadiene und Alkine

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    (1,2,3,4,5)Pentachlorferrocen reagiert mit Butyllithium und anschließend mit MeSSMe zu [C5Cl4(SMe)]FeCP (Cp = η5-C5H5) (1). Durch Wiederholung dieser Prozedur lassen sich [C5Cl3(SMe)2]FeCp (2) und [C5Cl2(SMe)3]FeCp (3) erhalten. Eine Kristallstrukturanalyse von 2 zeigt eine 1,3-Anordnung der beiden SMe-Gruppen. Eine Anzahl unsymmetrischer Cymantrenbis- und tristhioether (4–6) wurde auf ähnliche Weise aus [C5Cl4(SR)]Mn(CO)3 bzw. [C5Cl3(SR)2]Mn(CO)3 (R = Me, Ph) dargestellt. Auch Cymantrenyl-Selenoether [C5Cl5−n(SeR)n]Mn(CO)3 (7–10) (R = Me, n = 1, 2, 3; R = Ph, n = 2) konnten erhalten werden

    ChemInform Abstract: PREPARATION OF (2.1.2.1)PARACYCLOPHANE

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    ChemInform Abstract: SULFUR DERIVATIVES OF METHYLCYMANTRENE

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    Impacts de l’expansion territoriale mexica sur l’économie des cités soumises, Mexique central, 1430-1520 après J-C)

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    International audience"From 1430 to 1520 A.D, the Mexica (or Aztecs) extended their empire through conquest of numerous cities in central Mexico. In this article, we highlight two major consequences of Mexica expansion : the obligation for conquered people to pay tribute and the empire’s reorganisation in tributary provinces. First, we examine the impact on the economy of subjected cities, in terms of production, impoverishment or enrichment of the population. Changes in production observed in data from three archaeological sites in the state of Morelos show that there were various degrees of implication in the production of tribute. Second, the creation of the Tepequacuilco and Tepeaca provinces is examined in order to observe the effects of changing the pre-existing regional organization." (source éditeur
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