The first 1,3,2-diazaalumina-[3]ferrocenophanes

Wrackmeyer, Bernd; Klimkina, Elena V.; Milius, Wolfgang

doi:10.1016/j.inoche.2006.04.003

Cited by 13 publications

(7 citation statements)

References 39 publications

(9 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the 2D 1 H– 13 C NMR spectrum (Figure 1), this overlap is resolved, and the assignment is straightforward. The δ 29 Si value (–0.8 ppm) is in the expected range and is comparable with the data for the pyridine adducts of corresponding aluminium hydride 4 (δ 29 Si 2.9 ppm),11 ‐chloride 5a (δ 29 Si 4.0 ppm)11 or ‐alkyl [δ 29 Si 2.5 ppm (Me),13 0.8 ppm (Et),13 –1.1 ppm ( t Bu)] 12…”

Section: Resultssupporting

confidence: 85%

“…The pyridine ligands are always located between the N–SiMe 3 groups, which is in contrast to the finding for 4 , 5 ,11 and the Al–Me and Al–Et derivatives 13. However, the orientation of the Al–pyridine unit in 6 is analogous to that for the Al– t Bu compound,12 which supports the suggestion that minimized steric repulsion controls this particular conformation.…”

Section: Resultssupporting

confidence: 49%

“…Apparently, a very specific source of hydrolysis is required to produce 6 . When we studied the reaction of N , N ′‐dilithium derivative 2 with Cp*AlCl 2 ,15 we obtained chloride 5a 11,12 instead of the expected 1,3‐diaza‐2‐alumina[3]ferrocenophane with an Al‐Cp* functionality. Together with chloride 5a , the reaction solution contained 1 and 6 .…”

Section: Resultsmentioning

confidence: 99%

“…Examples of dialuminoxanes with two amino functionalities at both aluminum atoms are rare 7. Recently, we showed that 1,1′‐bis(trimethylsilylamino)ferrocene ( 1 )8 and its N , N ′‐dilithium derivative 2 9,10 can be readily converted into 1,3‐diaza‐2‐alumina[3]ferrocenophanes with Al–H ( 3 , 4 ),11 Al–halogen ( 5 ),11 or Al–alkyl functionalities12,13 (Scheme ). In the course of these and related studies, we repeatedly observed a side product in the reaction mixtures, for which we had assumed a dialuminoxane structure stabilized as dipyridine adduct 6 .…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Pyridine‐Stabilized Alumoxane Containing Two 1,3,2‐Diazaalumina[3]ferrocenophane Units

2007

Self Cite

View full text Add to dashboard Cite

Dialuminoxane 6, in which both aluminum atoms are coordinated by pyridine and each is part of a 1,3‐bis(trimethylsilyl)‐1,3,2‐diazaalumina[3]ferrocenophane unit, was isolated as a side product accompanying the synthesis of the corresponding [3]ferrocenophane with Al–H or Al–Cl functionalities. Although attempted high‐yield syntheses of 6 failed, its structure could be established by 1H, 13C, and 29Si NMR spectroscopy in solution and by X‐ray structural analysis in the solid state. In various experiments to obtain 6, crystalline material was isolated and identified as the desired dialuminoxane either with a linear Al–O–Al (6A) or bent Al–O–Al (6B) unit. This is the first example of a structurally characterized bis(amino)dialuminoxane.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)

show abstract

Section: Resultssupporting

confidence: 85%

Section: Resultssupporting

confidence: 49%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Pyridine‐Stabilized Alumoxane Containing Two 1,3,2‐Diazaalumina[3]ferrocenophane Units

2007

Self Cite

View full text Add to dashboard Cite

show abstract

“…Examples of crystal structures of pyridine adducts of 1,3,2-diazaalumina- [3]ferrocenophanes have been reported [8,9]. In the Al-tert-Bu derivative [8], the tert-Bu group avoids interactions with the N-SiMe 3 groups and is therefore, oriented differently from the Al-Me and Al-Et groups in 4a,b. Other examples are the Al-F-, Al-Cl-, and Al-Br derivatives and also 4(H) (see Table 2), for all of which relevant structural properties are similar to those of 4a,b.…”

Section: X-ray Structural Studies Of the Ferrocenophanes 2b 4abmentioning

confidence: 99%

Ferrocenophanes with Interannular Nitrogen‐Aluminum Bridges – Synthesis and Structure

Wrackmeyer

Klimkina

Milius

2007

Zeitschrift anorg allge chemie

Self Cite

View full text Add to dashboard Cite

The reaction of 1,1Ј-bis(trimethylsilylamino)ferrocene (1) with trimethyl-or triethylaluminum proceeds by elimination of methane or ethane, respectively, to novel ferrocenophanes 2a,b containing an N 2 Al 2 bridge. Addition of pyridine to 2 affords the pyridine adducts of 1,3-diaza-2-alkylalumina-[3]ferrocenophanes (4a,b) and of AlR 3 . The [3]ferrocenophanes 4 can be converted into 2 by addition of AlR 3 . The solution-state structure of the new compounds follows from a consistent set of NMR spectroscopic data Scheme 1 Reaction of 1,1Ј-bis(trimethylsilylamino)ferrocene 1 with trialkylaluminum.

show abstract

Five‐ and Four‐Coordinate 1,3‐Diaza‐2‐yttria‐ and 1,3‐Diaza‐2‐scandia‐[3]ferrocenophanes

2008

Self Cite

View full text Add to dashboard Cite

2‐Chloro‐1,3‐bis(trimethylsilyl)‐1,3‐diaza‐2‐metalla‐[3]ferrocenophanes with M = Y (3) and Sc (4) have been prepared as the dipyridine adducts, starting from YCl3 and ScCl3, respectively, and N,N′‐dilithio‐N,N′‐bis(trimethylsilyl)‐1,1′‐diaminoferrocene (2). The reaction of 3 with sodium pentamethylcyclopentadienide (NaCp*) gave the complex 5, in which the yttrium atom is four‐coordinate, bearing the diamido ligand, Cp* and one pyridine ligand. An ate complex of four‐coordinate yttrium (6) was obtained, when YCl3 was treated with 2 equiv. of 2. In 6a, the lithium atom is threefold coordinated by two of the four amido nitrogen atoms and by pyridine, and addition of an excess of pyridine gave the separated ion pairs (6b) in solution. The molecular structures of 3, 5 and 6a were determined by X‐ray structural analysis, and the solution‐state structures were deduced from consistent NMR spectroscopic data sets (1H, 13C, 29Si, 89Y NMR). The 89Y nuclear magnetic shielding of amido complexes appears to increase with the coordination number (3, 4, 5) of yttrium.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)

show abstract

The first 1,3,2-diazaalumina-[3]ferrocenophanes

Cited by 13 publications

References 39 publications

A Pyridine‐Stabilized Alumoxane Containing Two 1,3,2‐Diazaalumina[3]ferrocenophane Units

A Pyridine‐Stabilized Alumoxane Containing Two 1,3,2‐Diazaalumina[3]ferrocenophane Units

Ferrocenophanes with Interannular Nitrogen‐Aluminum Bridges – Synthesis and Structure

Five‐ and Four‐Coordinate 1,3‐Diaza‐2‐yttria‐ and 1,3‐Diaza‐2‐scandia‐[3]ferrocenophanes

Contact Info

Product

Resources

About