Octaethyldiphosphaferrocene: An Efficient Ligand in the Palladium-Catalyzed Suzuki Cross-Coupling Reaction
作者:Xavier Sava、Louis Ricard、François Mathey、Pascal Le Floch
DOI:10.1021/om0005699
日期:2000.11.1
Syntheses of octaethyldiphosphaferrocene 4 and tetraethylphosphaferrocene 5 are presented. Tetraethylzirconacyclopentadiene 1 reacts with PCl3 in dichloromethane to yield the 1-chlorotetraethylphosphole 2, which upon reduction by lithium in excess, yields the teraethylphospholide anion 3. Anion 3 was subsequently converted into 4 or 5 by treatment with FeCl2 or with [Fe(η6-C9H12)(η5-C5H5)][PF6] respectively
Single electron reduction of tetracyanoquinodimethane, TCNQ, and phenazine and two electron reduction of TCNQ by organo-iron electron reservoir complexes
cp(C6Me6)FeI, (1), (cp = C5H5) reacts with one equivalent of phenazine and tetracyanoquinodimethane, TCNQ, to give the singleelectron transfer salts cp(C6Me6)Fe+, phenazine–, (2), and cp(C6Me6)Fe+, TCNQ–, (3), whereas addition of TCNQ to 2 equivalents of (1) or cp(PriPh)FeI gives the crystalline salts cp(arene)Fe+}2 TCNQ2–, (4) and (5); (C6Me6)2Fe0, (7), also reacts with one equivalent of these acceptors
cp(C 6 Me 6)Fe I,(1)(cp = C 5 H 5)与一当量的吩嗪和四氰基喹二甲烷TCNQ反应,得到单电子转移盐cp(C 6 Me 6)Fe +,吩嗪–,(2)和cp(C 6 Me 6)Fe +,TCNQ –,(3),而将TCNQ添加到2当量的(1)或cp(Pr i Ph)Fe I中则得到结晶盐 cp(芳烃)Fe + }2 TCNQ 2 –,( 4)和( 5);(C 6 Me 6) 2 Fe 0( 7)也与一当量的这些受体反应,得到(C 6 Me 6) 2 Fe +,吩嗪-,( 8)和(C 6 Me 6) 2 Fe + TCNQ –,( 9)。
Wavelength dependent photochemistry of an iron–arene organometallic photoinitiator: a quantitative study of the photoreactivity†
作者:Vladimír Jakúbek、Alistair J. Lees
DOI:10.1039/a903975i
日期:——
The quantitative photochemistry of the widely used cationic photoinitiator complex, [CpFe(η6-isopropylbenzene)]PF6, has been investigated in several different solvents as a function of exciting wavelength in the 355â683 nm region; the photoefficiency results reveal that the system exhibits a strong wavelength dependence following excitation into its ligand field (LF) manifold and that the photochemistry does not occur solely from the lowest lying LF triplet excited state.
Quantitative Wavelength-Dependent Photochemistry of the [CpFe(η<sup>6</sup>-ipb)]PF<sub>6</sub> (ipb = Isopropylbenzene) Photoinitiator
作者:Vladimír Jakúbek、Alistair J. Lees
DOI:10.1021/ic000643f
日期:2000.12.1
lowest-lying triplet ligand field state (633, 683 nm). Absolute photochemical quantum efficiency (phi cr) results reveal that the system exhibits a strong excitation wavelengthdependence in each investigated solvent and that the reaction is extremely efficient in the UV and visible regions. The wavelengthdependence also reveals that the photochemistry does not occur solely from the lowest-lying ligand field
Synthesis and X-ray Crystal Structure Analysis of a Cp-Substituted Phosphaferrocene
作者:Gilles Frison、Louis Ricard、François Mathey
DOI:10.1021/om0106480
日期:2001.12.1
At 140 °C in THF, a 2,3,4,5-tetramethyl-1-cyclopentadienylide anionic substituent migrates from phosphorus to the α-carbon of the corresponding P-substituted 3,4-dimethylphosphole 2. The resulting 2-cyclopentadienyl-3,4-dimethylphospholide ion (3) reacts with a [CpFe]+ source to give the corresponding 2-cyclopentadienyl-3,4-dimethyl-1-phosphaferrocene (5) as a mixture of two diastereomers, one of which