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Reactions of Ru3(CO)12 with 2-pentynal-diethyl-acetal. The crystal structure of Ru2(CO)6[μ-η4-{EtC2C(H)(OEt)2}CO{EtC2C(H)(OEt)2}] and its reactivity towards tetraethyl-orthosilicate

“…Complex 6 has been identified as the dihydride H 2 Ru 3 -(CO) 9 (CH 3 CH 2 C"CCHO) with a parallel alkyne; this kind of structural arrangement is quite common for ruthenium-alkyne derivatives [4]. Complex 7 has been identified as the monohydridic, allylic HRu 3 (CO) 9 -(HCCHCCH 2 CH 3 ), homologue of complex 1.…”

“…The main product of the reactions with TSPA was the allylic complex (l-H)Ru 3 (CO) 9 (l 3 -g 3 -C 3 H 3 ) (complex 1) [1] whereas from the reactions of BUD we obtained the butadienylic open cluster (l-Cl)Ru 3 (CO) 9 [l 3 -g 4 -H 2 CCC(H)CH 2 ] (complex 2) [2]; finally, when Ru 3 (CO) 12 was reacted with DCB, the complex (l-H) 2 Ru 3 (CO) 9 [H 2 C@C(H)C"CC(@O)OCH 3 ] (3) [3] containing a ene-yne bound in parallel fashion [4] was obtained. The structures found for complexes 1-3 are shown in Scheme 2.…”

“…2 )(CO)][18] (4b), Ru 2 (CO)6 [{C(C"CPh)@CPh} 2 -(CO)][19] (4c), Ru 2 (CO)4 (i-Pr-Pyca)[{C(C(O)OMe) @ C(C(O)OMe)} 2 (CO)] (4d 0 ) and Ru 2 -(CO) 4 (t-Bu-Pyca)-[{C(C(O)OMe)@C(C(O)OMe)} 2 (CO)][20] (4d 00 ) (Pyca = pyridine-2-carbaldimine). The main structural parameters of the complexes are closely comparable.…”

Reactions of Fe3(CO)12 with 2-methyl-3-butyn-1-ol and 3-pentyn-1-ol under basic methanolic conditions: The crystal structures of Fe2(CO)6(μ-CO)(μ-η2-[HCC{C(CH3)2}C(O)(OCH3)]) and of (μ-H)Fe3(CO)9(μ3-η3-[H3CCC(CH2)(CH2)CO])

“…Complex 3 contains an intact alkynic ligand coordinated parallel [14] to the edge of a closed triangular cluster: a tempting hypothesis is that it could be the precursor of complex 5. However, we could not observe this complex under basic methanolic conditions.…”

The reaction of Ru3(CO)12 with 1,4-dichloro-but-2-yne in basic methanolic solution. Synthesis and crystal structure of (μ-H)2Ru3(CO)9{μ3-η2-[H2CC(H)CCC(O)OCH3]}

“…Trinuclear clusters bearing a parallel acetylene are quite common in alkyne-cluster chemistry; in a relatively recent review [21] we could report 59 X-ray structural determinations for such complexes. In more recent times at least other 25 structural determinations have been reported.…”