Literature DB >> 23527879

Easy access to silicon(0) and silicon(II) compounds.

Kartik Chandra Mondal1, Prinson P Samuel, Mykyta Tretiakov, Amit Pratap Singh, Herbert W Roesky, A Claudia Stückl, Benedikt Niepötter, Elena Carl, Hilke Wolf, Regine Herbst-Irmer, Dietmar Stalke.   

Abstract

Two different synthetic methodologies of silicon dihalide bridged biradicals of the general formula (L(n)•)2SiX2 (n = 1, 2) have been developed. First, the metathesis reaction between NHC:SiX2 and L(n): (L(n): = cyclic akyl(amino) carbene in a 1:3 molar ratio leads to the products 2 (n = 1, X = Cl), 4 (n = 2, X = Cl), 6 (n = 1, X = Br), and 7 (n = 2, X = Br). These reactions also produce coupled NHCs (3, 5) under C-C bond formation. The formation of the coupled NHCs (L(m) = cyclic alkyl(amino) carbene substituted N-heterocyclic carbene; m = 3, n = 1 (3) and m = 4, n =2 (5)) is faster during the metathesis reaction between NHC:SiBr2 and L(n): when compared with that of NHC:SiCl2. Second, the reaction of L(1):SiCl4 (8) (L(1): =:C(CH2)(CMe2)2N-2,6-iPr2C6H3) with a non-nucleophilic base LiN(iPr)2 in a 1:1 molar ratio shows an unprecedented methodology for the synthesis of the biradical (L(1)•)2SiCl2 (2). The blue blocks of silicon dichloride bridged biradicals (2, 4) are stable for more than six months under an inert atmosphere and in air for one week. Compounds 2 and 4 melt in the temperature range of 185 to 195 °C. The dibromide (6, 7) analogue is more prone to decomposition in the solution but comparatively more stable in the solid state than in the solution. Decomposition of the products has been observed in the UV-vis spectra. Moreover, compounds 2 and 4 were further converted to stable singlet biradicaloid dicarbene-coordinated (L(n):)2Si(0) (n = 1 (9), 2 (10)) under KC8 reduction. Compounds 2 and 4 were also reduced to dehalogenated products 9 and 10, respectively when treated with RLi (R = Ph, Me, tBu). Cyclic voltametry measurements show that 10 can irreversibly undergo both one electron oxidation and reduction.

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Year:  2013        PMID: 23527879     DOI: 10.1021/ic400357p

Source DB:  PubMed          Journal:  Inorg Chem        ISSN: 0020-1669            Impact factor:   5.165


  4 in total

1.  Stabilization of elusive silicon oxides.

Authors:  Yuzhong Wang; Mingwei Chen; Yaoming Xie; Pingrong Wei; Henry F Schaefer; Paul von R Schleyer; Gregory H Robinson
Journal:  Nat Chem       Date:  2015-04-20       Impact factor: 24.427

Review 2.  Recent Advances in the Domain of Cyclic (Alkyl)(Amino) Carbenes.

Authors:  Saroj Kumar Kushvaha; Ankush Mishra; Herbert W Roesky; Kartik Chandra Mondal
Journal:  Chem Asian J       Date:  2022-02-26

3.  Carbene-Stabilized Main Group Radicals and Radical Ions.

Authors:  Caleb D Martin; Michele Soleilhavoup; Guy Bertrand
Journal:  Chem Sci       Date:  2013-08-01       Impact factor: 9.825

Review 4.  Stable cyclic (alkyl)(amino)carbene (cAAC) radicals with main group substituents.

Authors:  Subrata Kundu; Soumen Sinhababu; Vadapalli Chandrasekhar; Herbert W Roesky
Journal:  Chem Sci       Date:  2019-04-08       Impact factor: 9.825

  4 in total

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