Synthese, Struktur und Hydrolyse von Tetrakis(tetrahydropyran)strontium-bis[bis(dimethylisopropylsilyl)phosphanid]

Westerhausen, Matthias; Digeser, Matthias H.; Nöth, Heinrich; Knizek, Jörg

doi:10.1002/(sici)1521-3749(199802)624:2<215::aid-zaac215>3.0.co;2-o

Cited by 23 publications

(5 citation statements)

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“…The strontium tetrahedron is centered by an oxygen atom that stems from THF cleavage. Interstitial oxygen atoms are well known for strontium cages, as, for example, in square Sr 5 (μ 5 -O) pyramids and in Sr 4 (μ 4 -O) tetrahedra. , All Sr···Sr edges of the Sr 4 tetrahedron of 5 are bridged by monovalent anions. Two opposite edges are bridged by phenyl groups; all other edges by iodide anions.…”

Section: Resultsmentioning

confidence: 99%

Stability and Reactivity of Phenylstrontium Compounds in Solution

2010

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Section: Resultsmentioning

confidence: 99%

Stability and Reactivity of Phenylstrontium Compounds in Solution

2010

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“…In terms of the historical development of the area, initial work focused upon the viability of group 2 protonolysis steps, (Scheme 2(a)(i)) to yield catalytically relevant species. To this end, the reactivity of alkaline earth amides and alkyls with alcohols, pyrroles, terminal alkynes, phosphines and C-H acidic heterocycles has been shown to yield alkoxide, [54][55][56] pyrrolide, 57 acetylide, 58-61 phosphide [62][63][64][65] and carbanion 66 fragments bound to a group 2 centre alongside the protonated basic residue. In the case of metal hexamethyldisilazides (2a-d), for example this is an amine, as summarised in Scheme 3.…”

Section: Hydroamination Of Alkenes and Alkynesmentioning

confidence: 99%

Alkaline earths as main group reagents in molecular catalysis

2016

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The past decade has witnessed some remarkable advances in our appreciation of the structural and reaction chemistry of the heavier alkaline earth (Ae = Mg, Ca, Sr, Ba) elements. Derived from complexes of these metals in their immutable +2 oxidation state, a broad and widely applicable catalytic chemistry has also emerged, driven by considerations of cost and inherent low toxicity. The considerable adjustments incurred to ionic radius and resultant cation charge density also provide reactivity with significant mechanistic and kinetic variability as group 2 is descended. In an attempt to place these advances in the broader context of contemporary main group element chemistry, this review focusses on the developing state of the art in both multiple bond heterofunctionalisation and cross coupling catalysis. We review specific advances in alkene and alkyne hydroamination and hydrophosphination catalysis and related extensions of this reactivity that allow the synthesis of a wide variety of acyclic and heterocyclic small molecules. The use of heavier alkaline earth hydride derivatives as pre-catalysts and intermediates in multiple bond hydrogenation, hydrosilylation and hydroboration is also described along with the emergence of these and related reagents in a variety of dehydrocoupling processes that allow that facile catalytic construction of Si-C, Si-N and B-N bonds.

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“…Die Strontiumatome sind verzerrt oktaedrisch mit trans-sta È ndigen Phosphanid-Substituenten umgeben. Die Sr(n)±P(nm)-Absta È nde liegen mit einem Mittelwert von 307,2 pm im a È hnlichen Bereich wie bei (L) 4 Sr[P(SiMe 2 R) 2 ] 2 mit R als Methyl-(302 pm, L = THF [19]) und Isopropylrest (309 pm, L = THP [20]). Die Sr(n)±O(nm)-Bindungsla È ngen mit einem Mittelwert von 253,9 pm lassen auf keine nennenswerte intramolekulare sterische Spannung schlieûen.…”

Section: Introductionunclassified

Synthese und Struktur von Sr6P8-Polyedern in gemischten Phosphaniden/Phosphandiiden des Strontiums

Westerhausen¹,

Birg²,

Krofta³

et al. 2000

Z. anorg. allg. Chem.

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Die Strontiierung von H2PSiiPr3 (1) mit (THF)2Sr[N(SiMe3)2]2 in THF liefert farbloses Tetrakis(tetrahydrofuran‐O)strontium‐bis(triisopropylsilylphosphanid) (3) mit einem oktaedrisch koordinierten Zentralatom und trans‐ständigen Phosphanid‐Liganden. Die homometallische Metallierung in Toluol führt zur Eliminierung von 1 und THF, so daß beim Kühlen dieser Lösung Kristalle von Tetrakis(tetrahydrofuran‐O)hexastrontium‐tetrakis(triisopropylsilylphosphanid)‐tetrakis(triisopropylsilylphosphandiid) (4) auskristallisieren. Bei der äquimolaren Umsetzung von H2PSitBu3 (2) mit (THF)2Sr[N(SiMe3)2]2 in Toluol bildet sich zunächst heteroleptisches, dimeres {(Me3Si)2NSr(THF)2[P(H)SitBu3]}2 (5)2, das in THF‐Lösung zunächst zu (Me3Si)2N–Sr(THF)4[P(H)SitBu3] (6) monomerisiert und mit den homoleptischen Verbindungen (THF)2Sr[N(SiMe3)2]2 und (THF)4Sr[P(H)SitBu3]2 (7) im Gleichgewicht steht. Verbindung (5)2 geht eine intramolekulare Strontiierung ein, so daß Bis(tetrahydrofuran‐O)hexastrontium‐tetrakis[tri(tert‐butyl)silylphosphanid]‐tetrakis[tri(tert‐butyl)silylphosphandiid] (8) isoliert wird. Die zentralen Strukturelemente von 4 und 8 stellen Sr6P8‐Polyeder dar.

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Synthese, Struktur und Hydrolyse von Tetrakis(tetrahydropyran)strontium-bis[bis(dimethylisopropylsilyl)phosphanid]

Cited by 23 publications

References 0 publications

Stability and Reactivity of Phenylstrontium Compounds in Solution

Stability and Reactivity of Phenylstrontium Compounds in Solution

Alkaline earths as main group reagents in molecular catalysis

Synthese und Struktur von Sr6P8-Polyedern in gemischten Phosphaniden/Phosphandiiden des Strontiums

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