Related Experiment Video
Updated: Jan 14, 2026

Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
Published on: June 21, 2017
A Ni-Al Hydride Cluster Bearing Site-Differentiated Al Centers: Demonstration of Olefin Insertion and Alkyl Transfer
Jordan R Gipper1, Sergio Gonzalez-Eymard2, Julia Abdoullaeva1
1Department of Chemistry, University of Kansas, Lawrence, Kansas 66045, United States.
Abstract:
Heterometallic assemblies have been key in uncovering new modes of reactivity, with synergistic effects resulting from main-group metals such as Al drawing particular attention given the diverse ligand modalities accessible to aluminum. Utilizing a reducing Al-dihydride metalloligand LAlH2 and bis (1,5-cyclooctadiene)nickel(0), we report cluster 1, [LNiAl]3H5R (R = 4-cyclooctenyl). The cluster core features Al/Al-H moieties asymmetrically capping a Ni3 plane and coordinating to a Ni-Ni edge. The Al centers display electronically differentiating sites through Al-H addition, olefin insertion, and alkyl transfer. Crystallographic, DFT, and spectroscopic tools establish the presence of three distinct Al centers that adopt sigma-donating alane, sigma-accepting alane, and nonalane character.
More Related Videos
09:37Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
Published on: October 18, 2019
10:10Application of Elemental Lanthanides in the Selective C-F Activation of Trifluoromethylated Benzofulvenes Providing Access to Various Difluoroalkenes
Published on: July 28, 2018
Related Concept Videos
Electrophilic Addition to Alkynes: Hydrohalogenation
Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
Reduction of Alkenes: Catalytic Hydrogenation
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Electrophilic Addition to Alkynes: Halogenation
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.