Trimethylsilyl-functionalised bis(indenyl)iron(II) complexes: solid-state structure of [η5-1,3-(SiMe3)2C9H5]2Fe

Structure–molecular orbital energy correlations in Me3Si-substituted bis(indenyl)iron complexes evidenced with UV–vis spectroscopy and cyclic voltammetry

“…Typically the complexes were obtained by reacting a solution of the selected substituted (trimethylsilyl)indene at À80°C initially with n-butyl-lithium and subsequently with FeCl 2 . No evidence of the conceivable presence of rac and meso isomers of complexes 2 and 4 was observed in any of the previously reported measurements used for characterization of the products [22].…”

“…3 for complex 2 and for complex 5. As no evidence of the presence of stereoisomers has been obtained before [22] the simultaneous presence of these isomers as a cause of the large peak splitting cannot be confirmed presently as a possible explanation. All relevant data are collected in Table 1.…”

“…Preparation of the bis(indenyl) iron complexes and their characterization has been described in detail elsewhere [22]. Typically the complexes were obtained by reacting a solution of the selected substituted (trimethylsilyl)indene at À80°C initially with n-butyl-lithium and subsequently with FeCl 2 .…”

Chiral Indenes and Group‐4 Metallocene Dichlorides Containing α‐ and β‐Pinenyl‐Derived Ligand Substituents: Synthesis and Catalytic Applications in Polymerization and Carboalumination Reactions

“…Other examples of both 1,2-and 1,3-trimethylsilyl-substituted bis(indenyl)-iron(ii) complexes have also been reported recently. [36] Finally, in a complementary approach, we investigated the possibility of using α-pinene as the chiral indenyl substituent. By deprotonation of α-pinene with nBuLi/tBuOK at 50°C using excess α-pinene [37] and the subsequent reaction of the obtained α-pinenyl potassium salt with 2-(chlorodimethylsilyl)indene [38] 21 or 1-(chlorodimethylsilyl)-indene [39] (1R)-23a/(1S)-23b, the corresponding 1-and 2-chirally substituted indenes 22 and (1R)-24a/(1S)-24b/25 were obtained in low (3 % and 21 %, respectively) yields (Scheme 8 and Scheme 9).…”

Complexes of manganese, iron and cobalt with sterically demanding indenyl ligands

“…Reaction of two equivalents of NaInd tBu (1-Na) and NaInd cHexyl (2-Na) with one equivalent of MI 2 (thf ) n (M = Mn (n = 3), Fe (n = 2)) and Co(acac) 2 in tetrahydrofuran yielded the corresponding manganocenes, ferrocenes and cobaltocenes as crystalline compounds in moderate yields. ‡ Whereas several substituted bis(indenyl)iron and -cobalt complexes have been synthesized previously, 28,[60][61][62][63][64][65][66][67][68][69][70] very little is known about the corresponding manganocenes with the exception of a recent report by Hanusa and co-workers. 18 It was pointed out that bis(indenyl)manganese complexes suffer from a substantial air-and moisture-sensitivity and that their syntheses require manganese starting materials of high purity otherwise intractable oils are obtained.…”