The reaction of [CH2(PPh2S)(2)] (1) with 2 equiv of MeLi in Et2O followed by addition of 0.5 equiv of SiCl4 afforded the base-stabilized 2-silaallene [(PPh2S)(2)CSiC(PPh2S)(2)] (2). It has been characterized by X-ray crystallography, NMR spectroscopy, and theoretical studies. The results show that compound 2 comprises a C--Si2+-C- ylidic skeleton with a negative charge at the Cmethanediide atoms and two positive charges at the Si atom. The reaction of 2 with excess PriN=C=NPrI in refluxing toluene gave the thiophosphinoyl-stabilized silene [(PPh2S)(2)C--Sr(NPri)(2)C=C(PPh2S)(2)] (3).
The reaction of [CH2(PPh2S)(2)] (1) with 2 equiv of MeLi in Et2O followed by addition of 0.5 equiv of SiCl4 afforded the base-stabilized 2-silaallene [(PPh2S)(2)CSiC(PPh2S)(2)] (2). It has been characterized by X-ray crystallography, NMR spectroscopy, and theoretical studies. The results show that compound 2 comprises a C--Si2+-C- ylidic skeleton with a negative charge at the Cmethanediide atoms and two positive charges at the Si atom. The reaction of 2 with excess PriN=C=NPrI in refluxing toluene gave the thiophosphinoyl-stabilized silene [(PPh2S)(2)C--Sr(NPri)(2)C=C(PPh2S)(2)] (3).