Preparation and reactions of some neutral pentamethylcyclopentadienylruthenium vinylidene complexes

Cyclopentadienyl ruthenium alkynyldithiocarboxylate complexes

“…The structure definitively proves that both S-atoms are bonded to the Ru-center with Ru-S distances of 2.3627(5) and 2.3667(5) Å . These distances are similar to those of CpRu(PPh 3 )(j 2 S,S-S 2 CC"CPh) (2.336(3), 2.353(4) Å ) [25] and also similar to those found for Cp * Ru(PPh 3 )(j 2 S,S-S 2 CC"CBu t ) (2.37(1), 2.350(9) Å ) [27]. The Cp-ligand is bonded to the Ru atom in g 5 -fashion with Ru-C bond distances ranging from 2.197(2) to 2.210(2) Å .…”

“…The presence of the alkynyldithiocarboxylate ligands is shown in the IR spectra of complexes 1 by the m C"C bands between 2120 and 2197 cm À1 . This frequency is similar to those reported for analogous complexes, e.g., Cp * Ru(PPh 3 )-(j 2 S,S-S 2 CC"CBu t ) (2195 cm À1 ) [27] and CpRu(PPh 3 )-(j 2 S,S-S 2 CC"CPh) (2170 cm À1 ) [25]. The 1 H NMR spectra of 1 exhibited Cp-protons in the range 4.50-4.56 ppm.…”

“…All of these complexes have been made by CS 2 insertion into the metal-carbon bond of the corresponding alkynyl-complexes. The complex Cp * Ru(PPh 3 )-(j 2 S,S-S 2 CC"CBu t ) (Cp * = C 5 Me 5 ) is prepared by the interaction of CS 2 with the carbene complex Cp * Ru-(PPh 3 )Cl(@C@CHBu t ) in the presence of a strong base [27].…”

New mononuclear ruthenium complexes of η5-cyclichydrocarbon containing azine ligands: Syntheses, spectral and structural studies

“…Literature survey reveals that most of the study on indenyl and pentamethylcyclopentadienyl ruthenium (II) complexes are centered on the reactivity study of these complexes towards alkenes and alkynes [14,15]. However, indenyl or Cp* phosphine complexes containing N-based ligands of the type [Cp 0 Ru(PPh 3 )(LL)] + are virtually unknown except our group reported a few of such complexes in the recent years [16,17].…”

Synthesis of the sterically crowded cycloheptatrienyl complexes [M(CO)(PPh3)2(η-C7H7)]+ (M=Mo or W): X-ray crystal structures of [W(CO)(PPh3)2(η-C7H7)][BF4] and [W(CO)2(PPh3)(η-C7H7)][BF4]·CH2Cl2

“…In half-sandwich systems, a key consideration is the interplay of ring size and ring substituents with the steric demands of other ligands in the complex. For example, in the complexes [RuCl(PPh 3 ) 2 (g-C 5 R 5 )] [R = H (Cp) or Me (Cp * )], the enhanced reactivity of the Cp * complex to dissociation of PPh 3 has been exploited in the synthesis of the novel neutral vinylidenes [2] [RuCl(@C@CHR 0 )-(PPh 3 )Cp * ], a process not mirrored by the corresponding Cp system. Although ring substituents may be critical in the design of sterically crowded, half-sandwich systems, the effect of increasing ring size is also an important factor [3].…”