ISSN:
0009-2940
Keywords:
Alkynylphosphines
;
Cobalt complexes
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Coordination Ability of Alkynylphosphines RnP(C≡C - R')3 - nAlkynylphosphines RP(C≡C-R')2 (2) react with one equivalent of octacarbonyldicobalt to yield selectively the η2-μ side-on-coordinated alkyne complexes (R)(R' - C≡C)P[(η2-C≡C-R')Co2(CO)6] (6); with another equivalent of Co2(CO)8 the dicoordinated compounds (R)P[(η2-C≡C-R')Co2(CO)6]2 (7) are obtained. 7 may also be synthesized directly by the reaction of 2 with two equivalents of Co2(CO)8. However, P(C≡C-Ph)3 yields with two equivalents of Co2(CO)8 the cyclic Co2P2C2 system {(Ph-C≡C)(R')P[(η2-C≡C-Ph)Co2(CO)5]} 2 (4) [R' = (η2-C≡C-Ph)Co2(CO)6]. Decarbonylation of 6a gives the six-membered cyclic compound {(Ph)(Ph - C ≡ C)P[(η2-C ≡ C - Ph)Co2(CO)5]}2 (8), while 6b yields the cluster Co3(CO)9(μ3-PtBu) (9). The structure of (tBu)P[(η2-C ≡ C - H)Co2)CO)6]2 (7b) is elucidated by an X-ray analysis.
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19911240203
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