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(η5-Cyclopentadienyl)[η2-bis(tert-butylsulfonyl)acetylene](carbonyl)cobalt:An electrophilic reagent to yield CpCo-stabilized cyclobutadiene derivatives

Authors
Journal
Journal of Organometallic Chemistry
0022-328X
Publisher
Elsevier
Publication Date
Volume
641
Identifiers
DOI: 10.1016/s0022-328x(01)01364-x
Keywords
  • Cyclobutadiene Complexes
  • Alkynes
  • Cobalt Complexes
  • Cyclization

Abstract

Abstract Various substituted (R=H, CH 3, SiMe 3, CO 2Me, COCH 3, EtMe 4) (R-η 5-cyclopentadienyl)[η 2-bis( tert-butylsulfonyl)acetylene](carbonyl)cobalt complexes ( 8– 13) proved to be very reactive towards alkynes under rather mild conditions. Dithiaacetylenes reacted at room temperature, dialkyl- and diarylalkynes had to be heated to 80–90 °C to yield the corresponding R-CpCo-stabilized cyclobutadiene complexes 18– 37 and 39– 42. X-ray investigations on 24– 26, 30, 36 and 39– 41 showed almost equal CC bond lengths in the cyclobutadiene rings.

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