Furans Bound Face‐On: Sequential Loss of CO in the Formation of [W(CO)₄(η⁴‐2,5‐dimethylfuran)]

Abstract

An unusual coordination mode is proposed for the furan ligand in the complex [(CO)4W(η4‐Me2Fur)] (2; Me2Fur=2,5‐dimethylfuran), which is produced by photolysis of a solution of [W(CO)6] in the presence of excess Me2Fur. The kinetics and activation parameters of its formation from the unstable precursor [(CO)5W(η1‐Me2Fur)] (1) are measured by using time‐resolved infrared absorption spectroscopy.

Subtle solvation behaviour of a biofuel additive: the methanol complex with 2,5-dimethylfuran

“…[35][36][37] Tungsten carbonyl complexes in solution were found to prefer the p face in 2,5-dimethylfuran, whereas the oxygen coordination is stable for furan and 2-methylfuran. 38 This is the opposite behaviour to the one observed here for methanol hydrogen bonding. All these findings support furans as promising hydrogen bond docking targets with a high sensitivity to donor and acceptor variations and a perspective of pronounced chemical control.…”

13 Chromium, molybdenum, and tungsten

“…The photochemical formation of tetracarbonyl[(2,3,4,5-g)-2,5-dimethylfuran]tungsten has been described. 143 The compound is formed by laser photolysis (308 nm) of a cyclohexane solution of W(CO) 6 containing an excess of 2,5-dimethylfuran. This produces the unstable complex [W(CO) 5 (g 1 -2,5-Me 2 C 4 H 2 O)], which rapidly eliminates CO to give tetracarbonyl[(2,3,4,5-g)-2,5dimethylfuran]tungsten.…”

A Boron Analogue of Furan. The Synthesis and Coordination Chemistry of 2-Substituted-1,2-Oxaborolides

“…Thiophene and pyrrole form few stable π-coordinated transition metal complexes. To the best of our knowledge only one complex containing an η 5 -furan ligand has been reported: the very labile [Cp*Ru(η 5 -C 4 H 4 O)]Cl. − We have been interested in anionic aromatic ligands, in which a CH group of a neutral aromatic is replaced by the isoelectronic BH - group. − In this manner 1 , 2 , and 3 are converted to 1,2-thiaborolide ( 4 ), 1,2-azaborolide ( 5 ), − and 1,2-oxaborolide ( 6 ), respectively. 4 and 5 are good ligands, which have been used to prepare Cp-like transition metal complexes. − Of particular significance is the observation that zirconium(IV) derivatives of 4 10 and 5 14 have high activity for the polymerization of olefins.…”