Nickel-Catalyzed Intermolecular Alkyne Hydrohydrazonation

We report a method for mild and atom-efficient synthesis of ketazines via nickel-catalyzed intermolecular hydroamination of internal alkynes with NH2-hydrazones. This alkyne hydrohydrazonation process is promoted by [Ni(cod)2] as a Ni(0) precatalyst and IPr as a N-heterocyclic carbene (NHC) ligand. A stoichiometric reaction between in situ generated [Ni(IPr)2] and benzophenone hydrazone (Ph2C=NNH2) led to the isolation of IPr-coordinated and hydroxo-bridged dinuclear Ni(II) hydrazonato complex [(IPr)Ni(HNN=CPh2)(miu2-OH)]2 that displayed high activity as a hydrohydrazonation pre-catalyst. We propose a catalytic cycle involving C-N bond formation via alkyne insertion into the Ni-N linkage of Ni(II) hydrazonato intermediates.

Stabilization Of Polystannanes Via Alkyne Insertion

Di-n-butylstannane, polydi-n-butylstannane and the acetylene inserted carbodistannanes were prepared using the methods described in literature [sic]. Their structures were confirmed by NMR analysis. Finally acetylene inserted polydibutylstannane, was prepared in a similar fashion and was evident from its unique

Stabilization Of Polystannanes Via Alkyne Insertion

Di-n-butylstannane, polydi-n-butylstannane and the acetylene inserted carbodistannanes were prepared using the methods described in literature [sic]. Their structures were confirmed by NMR analysis. Finally acetylene inserted polydibutylstannane, was prepared in a similar fashion and was evident from its unique

Cationic π-extended heteroaromatics via catalytic C–H activation annulative alkyne‐insertion sequence

Cationic π-conjugated organic molecules have broad application in material science as the next-generation organic materials. Annulative alkyne‐insertion π-extension (AAIPEX) has emerged as a promising synthetic approach for rapid synthesis of...

Visible light driven generation and alkyne insertion reactions of stable bis-cyclometalated Pt(iv) hydrides

The photochemical generation of isolable bis-cyclometalated Pt(iv) hydrides via photooxidative C–H addition reactions is demonstrated from easily accessible Pt(ii) precursors using visible light.

Ruthenium-catalyzed cascade C–H activation/annulation of N-alkoxybenzamides: reaction development and mechanistic insight

A highly selective ruthenium-catalyzed C–H activation/annulation through a pathway involving N–O bond cleavage prior to alkyne insertion is developed.