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Alkin⇄Vinyliden‐Umwandlungen auf Vierkernclustern
Author(s) -
Albiez Thomas,
Powell Anne K.,
Vahrenkamp Heinrich
Publication year - 1990
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19901230404
Subject(s) - chemistry , cyclopentadienyl complex , ligand (biochemistry) , alkyne , cluster (spacecraft) , rhodium , crystallography , stereochemistry , metal , tetrahedron , catalysis , organic chemistry , receptor , biochemistry , computer science , programming language
Alkyne ⇄ Vinylidene Rearrangements on Tetranuclear Clusters The expansion of vinylidene‐bridged FeCo 2 and RuCo 2 clusters 1a–d, 2d with (cyclopentadienyl)rhodium building blocks 3a, b mainly yields alkyne‐bridged FeCo 2 Rh and RuCo 2 Rh clusters ( 4b–d, 5a, b, 6d ), which exist as two isomers A and B . Additionally, in a few cases tetranuclear clusters 7, 8 containing one more CO group and bearing a μ 4 ‐vinylidene ligand are formed. The two cluster types can be interconverted by CO transfer. Starting from both types of FeCo 2 Rh clusters ( 4b, d, 8b ), metal exchange with NaMoCp(CO) 3 produces a product mixture in which the majour tetranuclear complex is the novel tetrahedral FeCoRhMo compound ( 11b, d, 12b ) with a μ 3 ‐vinylidene ligand. Thus it is shown that the shape as well as the mode of attachment of the CCHR ligand are controlled by the number and electronic structure of the organometallic building blocks. The structural assignments have been confirmed by four X‐ray structure determinations [ 4b(A), 4b(B), 8a, 11b ].