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Reactivity of the [η 2 ‐Bis( tert ‐butylsulfonyl)acetylene](carbonyl)(η 5 ‐cyclopentadienyl)cobalt Complex Towards Electron‐Rich and ‐Poor Acetylenes
Author(s) -
Goswami Avijit,
Staeb Tobias H.,
Rominger Frank,
Gleiter Rolf,
Siebert Walter
Publication year - 2005
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200500308
Subject(s) - cyclobutadiene , chemistry , cobalt , cyclopentadienyl complex , acetylene , reactivity (psychology) , medicinal chemistry , triple bond , photochemistry , stereochemistry , molecule , polymer chemistry , double bond , organic chemistry , catalysis , medicine , alternative medicine , pathology
The electron‐rich aminoacetylenes Et 2 NC 2 R ( 2a – c , R = SPh, PPh 2 , and Ph, respectively) react smoothly with [η 2 ‐bis( tert ‐butylsulfonyl)acetylene](carbonyl)(η 5 ‐cyclopentadienyl)co‐balt ( 1 ) to form the donor–acceptor stabilized (η 4 ‐cyclobutadiene)cobalt complexes 3a – c in good yields. However, treatment of the electron‐poor borylacetylenes 2d – f with the cobalt complex 1 does not lead to the expected (η 4 ‐cyclobutadiene)cobalt complexes. Analogously, the reaction of bis(1‐phenylethynyl)sulfide ( 2g ) with two equivalents of 1 gives rise to the sulfur‐bridged bis[η 4 ‐(cyclobutadiene)cobalt] complex 3g . The new cobalt complexes were characterized by NMR spectroscopy, mass spectrometry, and by X‐ray structure analysis for 3a , which reveals almost equal C–C bond lengths within the cyclobutadiene ring. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)