Phenylene-bridged binuclear organolanthanide complexes as catalysts for intramolecular and intermolecular hydroamination

Holming F. Yuen, Tobin J Marks

Research output: Contribution to journalArticle

70 Citations (Scopus)

Abstract

The phenylene-bridged bimetallic organolanthanide complexesp- bis{Cp''Ln[N(SiHMe2)2]2}phenylene (p-Ln2;Ln = Y, La, Cp'' = tetramethylcyclopentadienyl) and m-bis{Cp''La[N(SiHMe2)2]2}phenylene (m-La2) are investigated for possible Ln ··· Ln cooperative effects in hydroamination processes. These binuclear organolanthanide complexes efficiently catalyze the intramolecular hydroamination/cyclization of aminoalkenes, aminoalkynes, aminoallenes, and conjugated aminodienes with turnover frequencies as high as 10 h-1 at 60 °C, as well as intermolecular hydroaminations with turnover frequencies as high as 0.4 h-1 at 90 °C. Substrates include those having both compressed and extended junctures between the C-C unsaturation and the -NH2 group, as well as those with multiple -NH2 groups or places of C-C unsaturation. Reactivity trends appear to be dominated by nonbonded repulsive interactions, resulting in catalytic activities following the general trend m-Ln2 <p-Ln2. Organolanthanide amide complexes are also shown to catalyze the prototropic isomerization of alkynes.

Original languageEnglish
Pages (from-to)2423-2440
Number of pages18
JournalOrganometallics
Volume28
Issue number8
DOIs
Publication statusPublished - Apr 27 2009

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Alkynes
Cyclization
Isomerization
Amides
Catalyst activity
trends
catalysts
Catalysts
alkynes
Substrates
amides
isomerization
catalytic activity
reactivity
interactions

ASJC Scopus subject areas

  • Organic Chemistry
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

Cite this

Phenylene-bridged binuclear organolanthanide complexes as catalysts for intramolecular and intermolecular hydroamination. / Yuen, Holming F.; Marks, Tobin J.

In: Organometallics, Vol. 28, No. 8, 27.04.2009, p. 2423-2440.

Research output: Contribution to journalArticle

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