Proton transfer <i>vs.</i> oligophosphine formation by P–C/P–H σ-bond metathesis: decoding the competing Brønsted and Lewis type reactivities of imidazolio-phosphines
作者:Mario Cicač-Hudi、Christoph M. Feil、Nicholas Birchall、Martin Nieger、Dietrich Gudat
DOI:10.1039/d0dt03633a
日期:——
adjustment of the conditions allows us to selectively address each reaction channel and devise specificsynthesis methods for primary, secondary and tertiary imidazolio-phosphines, imidazolio-alkylphosphides, and cyclic oligophosphines, respectively. Mechanistic studies reveal that oligophosphines assemble in sequential P–P bond formation steps involving the condensation of cationic imidazolio-phosphines via
Reactions of Imidazolio‐Phosphides with Organotin Chlorides: Surprisingly Diverse
作者:Florian Goerigk、Nicholas Birchall、Christoph M. Feil、Martin Nieger、Dietrich Gudat
DOI:10.1002/ejic.202101026
日期:2022.3.18
Reactions of imidazolio-phosphides (“imidazolylidene-phosphinidenes”) with organotin mono- and dihalides follow different reaction channels. DFT studies reveal that the structurally different products observed represent the most stable species under the specific reaction conditions and indicate that the switch between different reaction modes is controlled by the Lewis acidity of the electrophile employed
Cross coupling of an imidazolio-phosphide with a N-heterocyclic bromo-borane gave a neutral analogue of a phosphamethine cyanine cation embodying a zwitterionic phosphide in which dative bonding of P-centred lone-pairs focuses on the imidazole unit.
通过咪唑膦与 N-杂环溴硼烷的交叉偶联,得到了膦甲烷氰阳离子的中性类似物,该类似物体现了一种齐聚物膦,其中以 P 为中心的孤对键主要集中在咪唑单元上。