The role of electrochemistry in the development of π-basic dearomatization agents

Abstract

Dihapto-coordination of aromatic molecules promotes numerous organic transformations that are not observed for the free aromatics. The development of osmium, rhenium, tungsten and molybdenum complexes that are capable of such binding is described in this perspective. The stability of these complexes strongly correlates to the metal d5/d6 reduction potential and electrochemical data has played a central role in their design.

Formation of η2-Coordinated Dihydropyridine–Ruthenium(II) Complexes by Hydride Transfer from Ruthenium(II) to Pyridinium Cations

“…Although rare precedents for η 2 bonding of the heterocycle as observed in these intermediates are found in the chemistry of [Os(NH 3 ) 5 ] 2+ , W(0), and Ru(II), to our knowledge, this is the first study to demonstrate such bond formation resulting from hydride-transfer reactions to yield the position-selective dihydro forms.…”

Steel rebar corrosion and corrosion-induced cracking in reinforced foamed concrete

“…The results showed that when the fly ash content is too high, it will reduce the foamed concrete's strength. Existing studies (Huet et al, 2006;Surendranath and Harman, 2006;Marsavina et al, 2007;Shi and Xu, 2007) have shown that the electrochemical process of chloride ion corrosion on steel rebar has a complex rusting mechanism. Surendranath and Harman (2006) found that chloride ions acted mainly as depassivating agents in the corrosion process of steel rebar.…”

“…Existing studies (Huet et al, 2006;Surendranath and Harman, 2006;Marsavina et al, 2007;Shi and Xu, 2007) have shown that the electrochemical process of chloride ion corrosion on steel rebar has a complex rusting mechanism. Surendranath and Harman (2006) found that chloride ions acted mainly as depassivating agents in the corrosion process of steel rebar. The steel rebar started to rust after a potential difference was formed on the surface of the steel substrate.…”

Molybdenum complexes of chiral C2-symmetric picchxn-type ligands: Synthesis, characterization, and structural studies

“…Under comparable reaction conditions, {Tp(PMe 3 )Mo(NO)} (from Tp(PMe 3 )Mo(NO)Br, υ NO =1617 cm -1 andE 1/2 = -1.19 V) failed to give evidence of dihapto complex formation [61][56,57,60,61,[85][86][87][88] but it should be noted that all molybdenum and tungsten (M) fragments that have thus far proven effective for this chemistry have had the common structure {Tp(L)M(NO}, in which L is an amine, phosphine, or phosphite ligand. The possibility that other aspects of these systems are essential for dearomatization remains an open question.3.5.…”