نتایج جستجو برای: silylenes
تعداد نتایج: 52 فیلتر نتایج به سال:
2-Silaimidazolium ions and 2-silaimidazolidinium ions were synthesized by Lewis acid-base adduct formation between N-heterocyclic silylenes and silyl arenium ions. They were isolated in high yields as their [B(C(6)F(5))(4)](-) salts. These salts are stable at room temperature and were characterized by NMR spectroscopy supported by the results of density functional computations of molecular stru...
While the reactivities of several transient silylenes and germylenes (the heavy homologues of singlet carbenes) have been characterized in detail in the gas phase and in solution, the chemistry of the corresponding tin derivatives (“stannylenes”) has remained virtually unexplored. To this end, the photochemistry of 3,4-dimethyl-1,1-diphenyl-1-stannacyclopent-3-ene (2) has been studied through s...
Heavier tetrylenes (HTs), which are the heavier analogues of carbenes, have been used as ligands in transition metal chemistry for more than 50 years. Having mind that cyclometallation is a valuable tool to modify ligand scaffolds, with important implications inorganic and organic chemistry, this microreview discusses detail reactions afforded complexes cyclometallated HTs. To date, eight HT li...
A silicon atom in the zero oxidation state stabilized by two carbene ligands is known as siladicarbene (silylone). There are two pairs of electrons on the silicon atom in silylone. This was recently confirmed by both experimental and theoretical charge density investigations. The silylone is stable up to 195 °C in an inert atmosphere. However, a substoichiometric amount (33 mol%) of potassium m...
The first N-heterocyclic silylene (NHSi) complexes of any s-block element to date are reported for calcium: [(η(5)-C5Me5)2Ca←:Si(O-C6H4-2-(t)Bu){(N(t)Bu)2CPh}] (6) and [(η(5)-C5Me5)2Ca←:Si(N(t)BuCH)2] (7). Complexes 6 and 7 are isolable in a facile way upon reaction of the corresponding free N-heterocyclic silylenes (NHSis) with [(η(5)-C5Me5)2Ca] (2). Complexes 6 and 7 were fully characterised ...
The cleavage of silicon–hydrogen bonds to generate silicon-containing metal complexes has played an essential role in the preparation organosilicon compounds. Herein, we report reaction cyclopentadienone iridium complex 1 with hydrosilanes afford hydroxycyclopentadienyl silyl 4 via umpolung Si–H bond. nucleophilicity Ir–Si bond resulting was demonstrated allyl halide and ethyl acrylate. Further...
A new silicon hydride clustering model was developed to study the nucleation of particles in a low-temperature silane plasma. The model contains neutral silanes, silylenes, silenes and silyl radicals as well as silyl and silylene anions. Reaction rates were estimated from available data. Simulations were carried out for typical discharge parameters in a capacitive plasma. It was shown that the ...
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