Product Details of 92390-26-6. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: Chloro(1,5-cyclooctadiene)(pentamethylcyclopentadienyl)ruthenium, is researched, Molecular C18H28ClRu, CAS is 92390-26-6, about Ru(II)-catalyzed cycloadditions of 1,6-heptadiynes with alkenes: New synthetic potential of ruthenacyclopentatrienes as biscarbenoids in tandem cyclopropanation of bicycloalkenes and heteroatom-assisted cyclocotrimerization of 1,6-heptadiynes with heterocyclic alkenes. Author is Yamamoto, Yoshihiko; Kitahara, Hideaki; Ogawa, Ryuji; Kawaguchi, Hiroyuki; Tatsumi, Kazuyuki; Itoh, Kenji.
The ruthenium(II)-catalyzed tandem cycloaddition of 1,6-heptadiynes with bicyclic alkenes, such as bicyclo[3.2.1]heptenones and norbornene derivatives, furnished 1:2 adducts between the diynes and two mols. of the bicycloalkenes together with common [2+2+2]-cyclocotrimerization products. The structure of a representative tandem 1:2 adduct I between di-Me dipropargylmalonate and 2,4-dimethylbicyclo[3.2.1]oct-6-en-3-one was unequivocally determined by x-ray anal. and was concluded to involve an unusual 1,2-dicyclopropylcyclopentene skeleton. On the basis of the spectroscopic analogy, the previously communicated structures of the tandem cycloadducts between the diynes and norbornene derivatives were corrected The formation of the tandem double-cyclopropanation products from the diynes is chem. evidence of a bis-carbenoid hybrid structure, 1,3,5-metallacyclopentatriene, of the corresponding 2,4-metallacyclopentadiene intermediates. The selectivity for the formation of the tandem cyclopropanation adducts was increased in the order of (η5-C9H7)Ru(PPh3)2Cl > CpRu(COD)Cl > Cp*Ru(COD)Cl, indicative of the η5 → η3 ring slippage of the cyclopentadienyl type ligands playing a key role in the tandem cyclopropanation. On the other hand, the normal [2+2+2]-cyclocotrimerization between 1,6-heptadiynes and alkenes was selectively catalyzed by Cp*Ru(COD)Cl, in the case of cyclic or linear alkenes possessing heteroatoms at the allylic position. The latter heteroatom-assisted cyclocotrimerization was also catalyzed by a paramagnetic dinuclear ruthenium(III) complex, [Cp*RuCl2]2, at lower temperature
《Ru(II)-catalyzed cycloadditions of 1,6-heptadiynes with alkenes: New synthetic potential of ruthenacyclopentatrienes as biscarbenoids in tandem cyclopropanation of bicycloalkenes and heteroatom-assisted cyclocotrimerization of 1,6-heptadiynes with heterocyclic alkenes》 provides a strategy for the preparation of materials with excellent comprehensive properties, which is conducive to broaden the application field of this compound(Chloro(1,5-cyclooctadiene)(pentamethylcyclopentadienyl)ruthenium)Product Details of 92390-26-6.
Reference:
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method