In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Oligomerization of butadiene with (η-C5R5)Ru(II) complexes; stoichiometric and catalytic chemistry, published in 1992-04-28, which mentions a compound: 92390-26-6, mainly applied to cyclopentadienylruthenium octatriene preparation catalyst oligomerization; ruthenium octatriene cyclopentadienyl preparation reaction, Product Details of 92390-26-6.
Treatment of (η-C5R5)Ru(η-butadiene)X (R = H, Me; X = Br, Cl) with butadiene, in the presence of silver triflate, yielded the corresponding cationic complexes I and II with 1,3,7-octatriene ligands, produced from the C-C bond formation at both the terminal carbon atoms of two mols. of butadiene. In the pentamethylcyclopentadienyl system II, the octatriene ligand was cyclodimerized to 1,5-cyclooctadiene when treated with CO. The ligand structure was elucidated by NMR spectroscopy. Catalytic reactions on these systems have also been studied. Thus, treatment of 1,3-butadiene with the octatriene complexes as catalysts afforded 1,5-cyclooctadiene (with II as catalyst) or a mixture of linear dodecatetraenes (with I as catalyst).
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Reference:
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method