173379-05-0Relevant articles and documents
Platinum-molybdenum complexes of cyclic tropynes, cumulenes, and alkynes
Klosin, Jerzy,Abboud, Khalil A.,Jones
, p. 596 - 603 (1996)
The bis(triphenylphosphine)platinum complexes of tropyne (1), cyclohepta-3,5-dien-1-yne (12), and cyclohepta-1,5-dien-3-yne (13) react rapidly with (η6-p-xylene)Mo(CO)3 in a mixture of CD2Cl2 and THF-d8 to give the bimetallic complexes 4-6. Reduction of 4 with LiAl(O-t-Bu)3H or KBEt3H gives a mixture of 5-7 (essentially quantitative) in a ratio of 5:10:85 and 8:21:71, respectively. The major isomer contains a 1,2,3,5-cycloheptatetraene ring, a ring system that has previously been inaccessible either free or complexed to a transition metal. Hydride abstraction from 5, 6, or 7 regenerates 4. X-ray crystal structures for 5 and 7 are reported. The absolute configuration of complex 7 in the crystal was determined.