کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1325222 | 1499862 | 2015 | 5 صفحه PDF | دانلود رایگان |
• A well soluble bulky pyrazolato-based gallium dichloride dimer is readily prepared.
• The pyrazolato-based gallium dichloride activates terminal silyl acetylenes at 110 °C.
• The ethynylation gives unusual chelating (N-alkenyl)pyrazolato gallium dichlorides.
• The mechanism of ethynylation is likely via an intramolecular electrophilic process.
• The reduction of a chelating gallium dichloride yields a Ga(II) species with Ga–Ga bond.
Several monomeric alkenyl-substituted pyrazolato gallium dichloride [(3,5-tBu2-N–CHC(SiR1R2R3)pz)GaCl2] 2(a–d) (R1 = R2 = R3 = Me (2a); R1 = R2 = R3 = Et (2b); R1 = R2 = Me, R3 = tBu (2c); R1 = R2 = Me, R3 = Ph (2d); 3,5-tBu2pz = 3,5-di-tert-butylpyrazolato) were synthesized in good yields by the reaction of dinuclear gallium compound [(η1,η1-3,5-tBu2pz)GaCl2]2 (1) and two equivalents of substituted ethynes. Compound 2a was further reduced with potassium–sodium alloy to afford a gallium(II) complex [(η1-tBu2pz-N–CHC(SiMe3))ClGa]2 with Ga–Ga single bond (3a).
A vinyl pyrazolato Ga(II) complex with Ga–Ga bond was prepared.Figure optionsDownload as PowerPoint slide
Journal: Journal of Organometallic Chemistry - Volume 780, 15 March 2015, Pages 1–5