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The reaction of the NHC-disilicon(0) complex [(IAr)Si=Si(IAr)] ( 1, IAr=:C{N(Ar)C(H)}2, Ar=2,6- iPr2C6H3) with two equiv of elemental Te in toluene at room temperature for three days afforded a mixture of the first dimeric NHC-silicon monotelluride [(IAr)Si=Te]2 ( 2) and its isomeric complex [(IAr)Si(μ-Te)Si(IAr)=Te] ( 3). When the same reaction was performed for ten days, only 3 was isolated from the reaction mixture. Compound 1 reacted with four equiv of elemental Te in toluene for four weeks, which proceeded through the formation of 2, 3 and the NHC-disilicon tritelluride complex [{(IAr)Si(=Te)}2Te] ( 5-Te), to form the dimeric NHC-silicon ditelluride [(IAr)Si(=Te)(μ-Te)]2 ( 4). The reactions are in line with theoretical mechanistic studies for the formation of 4. Compound 3 reacted with one equiv of elemental sulfur in toluene to form the first NHC-disilicon sulfur ditelluride complex [{(IAr)Si(=Te)}2S] ( 5-S). [ABSTRACT FROM AUTHOR]

An isolable phenylborylene species supported by two oxazol-2-ylidene ligands was synthesized and structurally characterized. Computational studies revealed the presence of lone-pair electrons on the boron atom in this molecule; therefore, there are eight electrons around the three-coordinate boron center. The nucleophilic property was confirmed by the reactions with trifluoromethanesulfonic acid and [(thf)Cr(CO)5], which gave the corresponding conjugate acid and a chromium-borylene complex, respectively. [ABSTRACT FROM AUTHOR]