Comparative Study of Homogeneous and Silica Immobilized N^N and N^O Palladium(II) Complexes as Catalysts for Hydrogenation of Alkenes, Alkynes and Functionalized Benzenes

Akiri, Saphan O.; Ngcobo, Nondumiso L.; Ojwach, Stephen O.

doi:10.1007/s10562-020-03192-1

Cited by 2 publications

(1 citation statement)

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“…Value addition of olefins via transition metal catalysts constitute some of the most versatile and industrially relevant processes. [1][2][3] Some of these reactions include but not limited to carbonylation, [4] polymerization, [5][6][7] oxidation, [8] Suzuki cross-coupling reactions, [9] hydrogenation, [10,11] and metathesis. [12] Of the carbonylation reactions, methoxycarbonylation of olefins has continued to gain much traction as various industrial and domestic products such as food additives, pesticides, fragrances, and solvents can be accessed through this protocol.…”

Section: Introductionmentioning

confidence: 99%

Sterically hindered (pyridyl)benzamidine palladium(II) complexes: Syntheses, structural studies, and applications as catalysts in the methoxycarbonylation of olefins

Akiri

Ojwach

2021

Applied Organom Chemis

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Reactions of ligands (E)‐N′‐(2,6‐diisopropylphenyl)‐N‐(4‐methylpyridin‐2‐yl)benzimidamide (L1), (E)‐N′‐(2,6‐diisopropylphenyl)‐N‐(6‐methylpyridin‐2‐yl)benzimidamide (L2), (E)‐N′‐(2,6‐dimethylphenyl)‐N‐(6‐methylpyridin‐2‐yl)benzimidamide (L3), (E)‐N′‐(2,6‐dimethylphenyl)‐N‐(4‐methylpyridin‐2‐yl)benzimidamide (L4), and (E)‐N‐(6‐methylpyridin‐2‐yl)‐N′‐phenylbenzimidamide (L5) with [Pd(NCMe)2Cl2] furnished the corresponding palladium(II) precatalysts (Pd1–Pd5), in good yields. Molecular structures of Pd2 and Pd3 revealed that the ligands coordinate in a N^N bidentate mode to afford square planar compounds. Activation of the palladium(II) complexes with para‐tolyl sulfonic acid (PTSA) afforded active catalysts in the methoxycarbonylation of a number of alkene. The resultant catalytic activities were controlled by the both the complex structure and alkene substrate. While aliphatic substrates favored the formation of linear esters (>70%), styrene substrate resulted in the formation of predominantly branched esters of up to 91%.

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