Mehrfachbindungen zwischen Hauptgruppenelementen und Übergangsmetallen, CXX. Niob‐ und Tantalamid–Komplexe sowie neue Cyclocarbodisilazane

Herrmann, Wolfgang A.; Dyckhoff, Florian; Herdtweck, Eberhardt

doi:10.1002/cber.19921251205

Cited by 9 publications

(2 citation statements)

References 26 publications

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“…E65, m680 (Farrugia et al, 2001). With a value of 1.791 (2) Å, the Si -N bond length is in the upper range of other known systems and is very close to the sum of the covalent radii of silicon and nitrogen (1.86 Å) (Lerner et al, 2005;Herrmann et al, 1992). The bond lengths of 2.128 (2) Å for N1-Zn and 2.110 (2) Å for N2-Zn are similar to other reported dative zinc-nitrogen bonds (Mimoun et al, 1999).…”

Section: Sup-1mentioning

confidence: 83%

“…For the synthesis and structure of cis-(2-amino-1,1-dimethylethylamine)dichloropalladium(II) ethanol hemisolvate, see: Farrugia et al (2001). For niobium and tantalum complexes of silylamides, see: Herrmann et al (1992). For the synthesis and structure of t Bu 2 Si N-SiCl t Bu 2 , see: Lerner et al (2005); for syntheses, structures and properties of chiral zinc halide catalysts, see: Mimoun et al (1999).…”

Section: Related Literaturementioning

confidence: 99%

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Dibromido[(tert-butylamino)dimethyl(piperidin-1-ylmethyl)silane-κ²N,N′]zinc(II)

Colquhoun

Strohmann

2009

Acta Cryst E

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Section: Sup-1mentioning

confidence: 83%

Section: Related Literaturementioning

confidence: 99%

Dibromido[(tert-butylamino)dimethyl(piperidin-1-ylmethyl)silane-κ²N,N′]zinc(II)

Colquhoun

Strohmann

2009

Acta Cryst E

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Synthesis and some chemical properties of 4-acyl-2,6-disilapiperazines. Molecular and crystal structure of 4-formyl-2,2,6,6-tetramethyl-2,6-disilapiperazine

Zamyshlyaeva¹,

Шипов²,

Крамарова³

et al. 1999

Chem Heterocycl Compd

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The increased activity of pentacoordinated silicon compounds relative to the corresponding tetrahedral analogs in nucleophilic substitution reactions is reflected in a review of the possibility of their wide use for synthetic purposes [1]. In particular we have previously synthesized the almost unstudied earlier heterocyclic systems -the l-oxa-4-aza-2-silacyclanes from N-monodimethylchlorosilylmethyl derivatives of amides [2-4], and we have obtained 4-acyl-2,6-disilamorpholines for the first time from N,N-bis(dimethylchlorosilylmethyl)amides [2, 5].In development of these investigations in the present work we have synthesized 4-acyl-2,6disilapiperazines, studied some of their chemical reactions, and studied one of them by X-ray diffraction analysis method. It should be noted that silicon-containing derivatives of piperazine are of interest with respect to their specific reactivity, their biological activity, and the possibility of using them in practice (see, for example, the review [6] and references cited in it).The proposed route for the synthesis of 4-acyl-2,6-disilapiperazines is based on the high disposition to cyclocondensation ofpentacoordinated dimethyl(amidomethyl)chlorosilanes with an additional functional group at the amide nitrogen atom. We previously used this approach to obtain 4-acyl-2,6-disilamorpholines [2, 5]. Carboxamides, which were converted into the corresponding N,N-bisdimethylchlorosilylmethyl derivatives by reaction with dimethylchloromethylchlorosilane/hexamethyldisilazane, served as the starting materials. These intermediate derivatives were hydrolyzed to the required disilamorpholines without isolation from the reaction mixture.Following the above strategy and one-pot technique but using ammonolysis reaction (with ammonia or primary amines) in place of hydrolysis, we have synthesized 4-acyl-2,2,6,6-tetramethyl-2,6-disilapiperazines Ia,b and Ha, b, which differ from those described in [6] by the presence ofacyl group in position 4 of the piperazine ring.

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