Mononuclear calcium complex as effective catalyst for alkenes hydrogenation

Abstract

Mononuclear calcium unsubstituted alkyl complex [(TpAd,iPr)Ca{(CH2)4Ph}(THP)], proposed as the catalytic alkene hydrogenation intermediate, was isolated for the first time.

Calcium Hydride Catalysts for Olefin Hydrofunctionalization: Ring‐Size Effect of Macrocyclic Ligands on Activity

“…In addition to colloidal [CaH 2 ] n , calcium hydride clusters have been reported to catalyze olefin hydrogenation [5] and a variety of hydride clusters of up to ten calcium atoms have been isolated [6] . As an example of a mononuclear calcium hydride with a terminal Ca−H bond, [(Tp Ad, i Pr )Ca(H)(thp)] (Tp Ad, i Pr =hydrotris(3‐adamantyl‐5‐isopropyl‐pyrazolyl)borate) ( B ) has been reported more recently to catalyze olefin hydrogenation [3f] . Such reactive mononuclear calcium hydrides can generally be conceived as the active species in catalytic reactions involving olefinic substrates.…”

Heterometallic Mg−Ba Hydride Clusters in Hydrogenation Catalysis

“…[16] They are also regarded intermediates in hydrogenation catalysis, a field that underwent rapid growth and development. [16][17][18][19][20][21][22][23][24][25][26][27] Their applications also include hydrogenation of challenging arenes, [26,28] Hydrogen-Isotope-Exchange, [29] CÀ F bond activation" [30][31][32] ethylene polymerization, [11] and controlled reactions with olefins to isolate first examples of Ca alkyls and a Sr ethyl complex. [11,33] However, looking back at the beginnings of Ae hydride chemistry, the research field was pioneered by a heterobimetallic system.…”

Lewis Acidic Cationic Strontium and Barium Complexes

“…[1][2][3] The field lately witnessed major breakthroughs especially in alkene and arene hydrogenation or functionalization. [4][5][6][7][8][9][10][11][12][13] Intermediate metal-alkene or arene πcomplexes play a superordinate role in substrate activation. For example, Ca-alkene interactions have been found crucial for successful catalytic alkene hydroamination.…”

“…Alkaline earth (Ae) metal catalysis started to develop at the beginning of this century [1–3] . The field lately witnessed major breakthroughs especially in alkene and arene hydrogenation or functionalization [4–13] . Intermediate metal‐alkene or arene π‐ complexes play a superordinate role in substrate activation.…”