English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Photochemical reactions of hexacarbonyl-μ-η 5:5 -fulvalene-dimolybdenum (1) with 1,3-butadiene (a), 2-methyl-1,3-butadiene (b), E-1,3-pentadiene (c), 2,3-dimethyl-1,3-butadiene (d), and E-3-methyl-1,3-pentadiene (e) yield the corresponding tetracarbonyl-η 4 -s-cisdiene-μ-η 5:5 -fulvalene-dimolybdenum complexes 3a-3e. In addition to 3a also η 4 -s-trans1,3-butadiene-tetracarbonyl-μ-η 5:5 -fulvalene-dimolybdenum (4) is formed. Similarily hexacarbonyl-μ-η 5:5 -fulvalene-ditungsten (2) forms with a and b tetracarbonyl-η 4 -s-cis-diene-μ-η 5:5 -fulvalene-ditungsten (5a, 5b) and bis(η 4 -s-cis-1,3-butadiene)-dicarbonyl-μ-η 5:5 -fulvalene-ditungsten (6). The complexes 3b —3e and also 5b are obtained as mixtures of the o- and u-isomers. Only for tetracarbonyl-η 4 -cis-2,3-dimethyl-1,3-butadiene-μ-η 5:5 -fulvalene-dimolybdenum (3d) an interconversion of the o- and u-isomers is observed with an energy barrier of ΔG 183  #  = 73.9 kJ/mol. Both isomers of 3d show hindered inversions with energy barriers of ΔG #  313  = 66.1 kJ/mol (u-3d) and ΔG 183  #  = 36.4 kJ/mol (o-3d). For o-3d the crystal and molecular structure was determined by an X-ray diffraction analysis. Hexacarbonylµ — η 5:5 -bis(cyclopentadiendiyl)methane-dimolybdenum (7), hexacarbonyl-μ-η 5:5 -bis(cyclopentadiendiyl)ethane-dimolybdenum and hexacarbonyl-μ-η 5:5 -bis(cyclopentadiendiyl)propane-dimolybdenum do not react with conjugated dienes. Upon UV irradiation 7 looses CO and forms by dimerization octacarbonyl-bis(μ-η 5:5 -(cyclopentadiendiyl-cyclopentadien-triyl)methane)-dihydrido-tetramolybdenum (8).

zeitschrift für naturforschung b

Gehinderte Ligandbewegungen in Übergangsmetallkomplexen, XLII [1]: Photoreaktionen von Hexacarbonyl-μ-η 5:5 -fulvalen-dimolybdän und -diwolfram mit konjugierten Dienen / Hindered Ligand Movements in Transition Metal Complexes, XLII [1]: Photoreactions of Hexacarbonyl-μ–η 5:5 -fulvalene-dimolybdenum and -ditungsten with Conjugated Dienes