Unusual orthometallation of a tetraphenylcyclopentadienone ligand

Abstract

Controlled pyrolysis of the reaction between [ Ru,(CO) ,,I and tetracyclone (tetraphenylcyclopentadienone) in refluxing heptanegivesa new complex with theempirical formula [Ru,(CO),(C,Ph,CO),] in moderate yield. The compound has been characterised by a single-crystal X-ray diffraction study [monoclinic, space group P2,/c, a = 12.1 30( 8), b = 20.972( 9), c = 20.861 (1 2) A, p = 98.80(5)O and Z = 41, which reveals that the structure contains a diruthenium pentacarbonyl unit [Ru(l )-Ru(2) Revision 5.

trans-Acetyldicarbonyl(η5-cyclopentadienyl)[tris(furan-2-yl)phosphane-κP]molybdenum(II)

“…These contacts between the acetyl carbonyl and hydrogen atoms may contribute to the unusual geometry adopted by the acetyl ligand, where the carbonyl points down, away from the Cp ring. In related structures reported by this laboratory (Whited et al, 2012) and others (Churchill & Fennessey, 1968;Michelini-Rodriguez et al, 1993;Adams et al, 1997Adams et al, , 2000, the carbonyl points up toward the Cp ring. These hydrogen-bonding interactions lead to the formation of layers parallel to (100), as shown in Fig.…”

“…For synthetic details for a related complex, see: Gladysz et al (1979). For related structures, see: Churchill & Fennessey (1968); Barnett et al (1972); Michelini-Rodriguez et al (1993); Adams et al (1997Adams et al ( , 2000; Whited et al (2012).…”

Activation of a 1,10-phenanthroline ligand on a rhenium tricarbonyl complex

“…12 Studies of the reactivity of terminal phosphido complexes are scarce. [13][14][15][16] Here we report that 1 reacts with electron-poor olefinic or acetylenic substrates to afford products resulting from addition to the N-adjacent carbon of phen.…”

Enhanced Nucleophilic Behavior of a Dimolybdenum Phosphinidene Complex: Multicomponent Reactions with Activated Alkenes and Alkynes in the Presence of CO or CNXyl

“…The identification of isomers and assignment of 1 H and 13 C NMR resonances of compounds 2 to 5 in solution was carried out using a combination of standard NOESY, DEPT, and HSQC experiments (see the Supporting Information). The acyl groups in compounds 2 a,b give rise to highly deshielded 13 C NMR resonances in the range δ =263–271 ppm, a position comparable to those of mononuclear molybdenum complexes with acyl ligands 18. A medium‐intensity IR band in the range 1500–1600 cm −1 was also observed in these compounds, which can be assigned to the corresponding CO stretch.…”