Synthesis and characterization of an amidinate-stabilized cis-1,2-disilylenylethene [cis-LSi{C(Ph)=C(H)}SiL] and a singlet delocalized biradicaloid [LSi(μ(2)-C(2)Ph(2))(2)SiL].

  title={Synthesis and characterization of an amidinate-stabilized cis-1,2-disilylenylethene [cis-LSi\{C(Ph)=C(H)\}SiL] and a singlet delocalized biradicaloid [LSi($\mu$(2)-C(2)Ph(2))(2)SiL].},
  author={Hui-Xian Yeong and Hong-Wei Xi and Kok Hwa. Lim and Cheuk-Wai So},
  volume={16 43},
The synthesis and characterization of novel cis-1,2-disilylenylethene [cis-LSi{C(Ph)=C(H)}SiL] (2; L=PhC(NtBu)(2)) and a singlet delocalized biradicaloid [LSi(μ(2)-C(2)Ph(2))(2)SiL] (3) are described. Compound 2 was prepared by the reaction of [{PhC(NtBu)(2)}Si:](2) (1) with one equivalent of PhC[triple chemical bond]CH in toluene. Compound 3 was synthesized by the reaction of 1 with two equivalents of PhC[triple chemical bond]CPh in toluene. The results suggest that the reaction proceeds… 
35 Citations
Synthesis and characterization of a singlet delocalized 2,4-diimino-1,3-disilacyclobutanediyl and a silylenylsilaimine.
The results show that compound 2 possesses singlet biradicaloid character with an extensive electronic delocalization throughout the Si( 2)C(2) four-membered ring and exocyclic C=N bonds.
Elegant approach to spacer arranged silagermylene and bis(germylene) compounds.
All reported reactions proceed without changing the oxidation states at the metal centers.
Preparation, characterization, and theoretical analysis of group 14 element(I) dimers: a case study of magnesium(I) compounds as reducing agents in inorganic synthesis.
This study highlights the synthetic utility of soluble and easy to prepare magnesium(I) dimers as valuable alternatives to the harsh, and often insoluble, alkali-metal reducing agents that are currently widely employed in the synthesis of low-oxidation-state organometallic/inorganic complexes.
Activation of alkynes by an α-diimine-stabilized Al-Al-bonded compound: insertion into the Al-Al bond or cycloaddition to AlN2C2 rings.
Reaction of 1 with phenylacetylene proceeds through cycloaddition of alkynes to the AlN2C2 rings to produce bis(bicyclic) products (3a and 3b).
Amidinate-Stabilized Group 9 Metal-Silicon(I) Dimer and -Silylene Complexes.
The coordination chemistry of the amidinate-stabilized silicon(I) dimer toward group 9 metal complexes is described and compounds 2-6 were characterized by NMR spectroscopy and X-ray crystallography.
An amidinate-stabilized germatrisilacyclobutadiene ylide.
The synthesis and characterization of new amidinate-stabilized germatrisilacyclobutadiene ylides [L (3)Si(3)GeL'] (L=PhC(NtBu)(2); L'=ËL; Ë=Ge (3), Si (7)) are described, which show that compounds 3 and 7 are not antiaromatic.
Reaction of a Base‐Stabilized Bis(silylene) [PhC(NtBu)2Si]2 with Cyclooctatetraene without Cleavage of the Si–Si Bond
The reaction of the benzamidinato-stabilized bis(silylene) [PhC(NtBu)2Si]2 with cyclooctatetraene resulted in the formation of a colorless compound 7 whithout cleavage of the Si–Si bond of the
Bis(silylenyl)- and bis(germylenyl)-substituted ferrocenes: synthesis, structure, and catalytic applications of bidentate silicon(II)-cobalt complexes.
The synthesis of the first isolatable oxygen-bridged bis(silylenes) D and pincer-type bis( silylene) E is described, which underlines that silylene are no longer laboratory curiosities and may provide access to new silicon(II)based functional groups in coordination chemistry toward transition metals.
Reaction of an N-heterocyclic carbene-stabilized silicon(II) monohydride with alkynes: [2+2+1] cycloaddition versus hydrogen abstraction.
Mechanistic investigations using an isotope labelling technique and DFT calculations suggest that this reaction occurs through a similar zwitterionic intermediate and subsequent hydrogen abstraction from a second molecule of phenylacetylene.
Synthesis and Characterization of an Amidinate-Stabilized Bisgermylene Oxide and Sulfide
The synthesis and characterization of the amidinate-stabilized bisgermylene oxide and sulfide [L2Ge−E−GeL2] (E = O (2), S (3); L2 = ButC(NAr)2, Ar = 2,6-Pri2C6H3) are described. Compound 2 was


Synthesis and structures of heteroleptic silylenes.
The reaction of benzamidinato silicon trichloride with potassium in THF afforded mononuclear chlorosilylene and novel heteroleptic silylene, which have been analyzed by X-ray crystallography.
Reactivity of a Disilyne RSi≡SiR (R = SiiPr[CH(SiMe3)2]2) toward π-Bonds: Stereospecific Addition and a New Route to an Isolable 1,2-Disilabenzene
The reaction of 1,1,4,4-tetrakis[bis(trimethylsilyl)methyl]-1,4-diisopropyltetrasila-2-yne 1 with cis- and trans-butenes produced cis- and trans-3,4-dimethyl-1,2-disilacyclobutenes 2a and 2b,
An unsymmetric substituted digermylene with a Ge(I)-Ge(I) bond and synthesis of a germylene-stannylene with a Ge(I)-Sn(I) bond.
Spectroscopic, structural and theoretical analysis of the N-heterocyclic germanium(II) nucleophile compounds revealed that they bear Ge-M (M = Ge and Sn) sigma bonds with ionic character.
Reactivity of a disilylene [{PhC(NBu(t))(2)}Si](2) toward bromine: synthesis and characterization of a stable monomeric bromosilylene.
An X-ray structure of compound 2 has been determined and the result shows that the Si(I)-Si(I) bond in 1 was cleaved by bromine.
Synthesis of a germanium analogue of a dithiocarboxylic acid anhydride from the Ge(i) pyridyl-1-azaallyl dimer.
The reaction of pyridyl-1-azaallyl germanium(ii) chloride RGeCl with lithium metal afforded the dimeric germania(i) compound [(RGe)(2)] (); compound reacts with an excess of elemental sulfur to afford the novel germium analogue of a dithiocarboxylic acid anhydride.
Synthetic, structural and theoretical studies of amidinate and guanidinate stabilised germanium(I) dimers.
Taken together, theoretical studies suggest that the Ge-Ge bonds of [{Ge(Piso)}(2)] and [Ge(Giso)2)] are associated with their HOMOs, whilst their LUMOs have substantial Ge- Ge pi-bonding character.
Reactions of the heavier group 14 element alkyne analogues Ar'EEAr' (Ar' = C6H3-2,6(C6H3-2,6-Pri2)2; E = Ge, Sn) with unsaturated molecules: probing the character of the EE multiple bonds.
Overall, the experiments showed that 1 is highly reactive toward unsaturated molecules, whereas the corresponding tin congener 2 is much less reactive.
Synthesis and characterization of the non-kekulé, singlet biradicaloid Ar'Ge(μ-NSiMe3)2GeAr' (ar' = 2,6-Dipp2C6H3, Dipp = 2,6-i-Pr2C6H3)
Reaction of Ar‘GeGeAr‘ (1) with an excess of Me3SiN3 gives the non-Kekule, biradicaloid Ar‘Ge(μ-NSiMe3)2GeAr‘ (3, Ar‘ = 2,6-Dipp2C6H3, Dipp = 2,6-i-Pr2C6H3) which has a planar Ge2N2Si2 array and
Synthesis, structure, and theoretical investigation of amidinato supported 1,4-disilabenzene.
Reaction of LSi-SiL (1) (L = PhC(NtBu)(2)) with diphenyl alkyne gave the first example of a room temperature stable 1,4-disilabenzene. The compound was characterized by means of single crystal X-ray
Reactivity of Ar'GeGeAr' (Ar' = C6H3-2,6-Dipp2, Dipp = C6H3-2,6-iPr2) toward alkynes: isolation of a stable digermacyclobutadiene.
The first reactions of the "digermyne" Ar'GeGeGeAr' with alkynes are reported, and the high reactivity of 1 emphasizes the fundamental differences between the GeGe and CC multiple bonds.