1309604-37-2Relevant articles and documents
Frustrated Lewis pairs beyond the main group: Cationic zirconocene- phosphinoaryloxide complexes and their application in catalytic dehydrogenation of amine boranes
Chapman, Andy M.,Haddow, Mairi F.,Wass, Duncan F.
, p. 8826 - 8829 (2011)
The cationic zirconocene-phosphinoaryloxide complexes [Cp 2ZrOC6H4P(t-Bu)2][B(C 6F5)4] (3) and [Cp*2ZrOC 6H4P(t-Bu)2][B(C6F5) 4] (4) were synthesized by the reaction of Cp2ZrMe 2 or Cp*2ZrMe2 with 2-(diphenylphosphino) phenol followed by protonation with [2,6-di-tert-butylpyridinium][B(C 6F5)4]. Compound 3 exhibits a Zr-P bond, whereas the bulkier Cp* derivative 4 was isolated as a chlorobenzene adduct without this Zr-P interaction. These compounds can be described as transition-metal-containing versions of linked frustrated Lewis pairs (FLPs), and treatment of 4 with H2 under mild conditions cleaved H 2 in a fashion analogous to that for main-group FLPs. Their reactivity in amine borane dehydrogenation also mimics that of main-group FLPs, and they dehydrogenate a range of amine borane adducts. However, in contrast to main-group FLPs, 3 and 4 achieve this transformation in a catalytic rather than stoichiometric sense, with rates superior to those for previous high-valent catalysts.
