1.3- diphenyl-2,2,2,4,4,4-hexacarbonyl

Reactions of Fes(CO)i2 with alkyl isocyanates or alkyl azides give the N,N dialkylureylene-diiron hexacarbonyls (RN)2COFe2(CO)6 (33) mass spectroscopy was used for the initial identification of these compounds 66>. The mass spectrum of the diphenyl derivative... 

Not only this Ni(0)-catalyzed reaction but also all reported allene dimer complexes, e.g., hexacarbonyl-p[l-3 l -3 -jj-(2,2 -biallyl)]diiron (Fe-Fe) (146), hexacarbonyl-/i-[l-3 l -3 -r)- (1,1 -diphenyl-2,2 -biallyl) ]diiron (Fe-Fe) (147), and di-/i-aeetato-/i-[l-3 l -3 -rj-(2,2,-biallyl) Jdipalladium (148) point to the formation of 2,2 -biallyl. A mononuclear Rh(I) complex containing this ligand was recently isolated (149). Accepting this biallyl formation, then the next step is the insertion to form the trimer ligand in complex IV. Thus the entire reaction paths leading to complexes I, II, and III may be depicted (Scheme 8). 

Acylmetallates lp,q generated by addition of lithio prop-2-ynylic ethers to hexacarbonyl chromium or tungsten afford oxacyclopenten-2-ylidene complexes 173 on contact with wet silica gel (Scheme 73).194 The chromium complex 173 (M = Cr) undergoes a condensation with tolane to give a 1,4-dioxy aromatic compound 174. Addition of cyclopentadiene to 173 (M = W) affords a Diels-Alder adduct 176 in a 1 3 exo/endo ratio,195 while addition of dimethylamine quite unexpectedly does not lead to production of an aminocarbene complex but to formation of 5,5 -diphenyl-2,2 -bifuran 175 (Scheme 73).196... 

The anti-proliferative effects of some dicobalt hexacarbonyl alkyne complexes derived from aspirin 21, from diphenyl acetylene 22, and from 2-propyn-l-ol have been studied on various cell lines, including... 

A series of alkyne cobalt hexacarbonyl complexes was synthesized by Jung et al. [116] and Gust et al. [117-119], These include, for example, Co2(CO)g complexes derived from aspirin 40, from diphenyl acetylene 41 and from 2-propyn-l-ol 42. 

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