Perceptible Influence of Pd and Pt Heterocyclic Carbene–Pyridyl Complexes in Catalytic Diboration of Cyclic Alkenes

Abstract

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N-heterocyclic carbene tethered amido complexes of palladium and platinum

“…Furthermore, the nucleophilic substitution reactions of alkyl or benzyl halides used to prepare the functionalised NHC ligands in these previously reported complexes contrasts with the cross-coupling strategy used to synthesise the pro-ligand 6, which enables efficient access to aryl substituted NHC ligands with the functional group (amine) also bound to the aromatic ring. Platinum analogues of these Pd catalysts have been reported, 54 but these are much less common.…”

Platinum(II) 1,2,4-Triazolin-5-ylidene Complexes: Stereoelectronic Influences on Their Catalytic Activity in Hydroelementation Reactions

“…Nevertheless, catalytic applications of 1,2,4-triazolin-5-ylidene complexes are much less explored in comparison to those of imidazolin-2-ylidenes. Hardly any Pt II -triazolin-5-ylidenes have been catalytically tested with the exception of [Pt­(NHC)­(py)­I 2 ] (NHC = 1,4-di­( n -butyl)-1,2,4-triazolin-5-ylidene; py = pyridine), which was active in the diboration of cyclic alkenes …”

“…Hardly any Pt II -triazolin-5-ylidenes have been catalytically tested with the exception of [Pt(NHC)(py)I 2 ] (NHC = 1,4-di(n-butyl)-1,2,4triazolin-5-ylidene; py = pyridine), which was active in the diboration of cyclic alkenes. 29 As part of our current interest in exploring the coordination chemistry and catalytic applications of 1,2,4-triazole-derived carbenes, we herein report the syntheses and characterizations of five platinum(II) 1,2,4-triazolin-5-ylidene complexes. Moreover, their catalytic activities in the hydration and hydrosilylation of phenylacetylene is reported.…”

Unexpected Generation of Diastereomers by Double Diboration of a Dialkyne

“…Along with hydroboration, [1][2][3][4] transition-metalcatalyzed diboration [5] has become useful for the functionalization of unsaturated organic compounds. [6,7] This reaction is widely applicable to substrates such as alkynes [8,9] arynes, [10] alkenes, [11][12][13] carbenoids, [14,15] as well as diazo [16] and carbonyl compounds. [17][18][19][20] Although bis(catecholato)diborane(4) and bis(pinacolato)diborane(4) represent by far the most commonly employed diborane(4) species, the reaction is not restricted to their use.…”