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Synthesis and Crystal Structure of the “Open” Calcocene [( t Bu 2 C 5 H 5 ) 2 Ca · thf]
Author(s) -
Overby Jason S.,
Hanusa Timothy P.
Publication year - 1994
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199421911
Subject(s) - cyclopentadienyl complex , metallocene , transition metal , crystallography , chemistry , ligand (biochemistry) , crystal structure , metal , stereochemistry , main group element , catalysis , organic chemistry , polymerization , biochemistry , receptor , polymer
Calcium behaves more like a transition metal than a main‐group element when it forms an “open” metallocene with the 2,4‐di‐ tert ‐butylpentadienyl ligand. Like most transition metal pentadienyl complexes, the title compound 1 (shown C on the right) contains pentahapto‐ rather than monohapto‐bound ligands. Unlike its transition metal counterparts, however, the metal–carbon bonds in 1 are noticeably longer than those in the analogous cyclopentadienyl complexes. Furthermore, the pentadienyl ligands in 1 have an anti ‐eclipsed arrangement, which is unprecedented for open metallocenes.