Pyrrolyl substituted allenylidene complexes of ruthenium.

Ruthenium-catalyzed enantioselective propargylation of aromatic compounds with propargylic alcohols via allenylidene intermediates.

Recent Advances in Catalytic Stereocontrolled Cycloaddition with Terminal Propargylic Compounds

Abstract Terminal propargylic compounds containing an alkyne unit and an alcohol or ester group in the propargylic position have a fairly acidic acetylenic hydrogen atom; this makes them versatile substrates for further chemical transformation. Some transition metals such as ruthenium or copper exhibit specific affinity for terminal propargylic compounds, generating dielectrophilic ruthenium– o...

A new method for the preparation of N-stabilized allenylidene complexes of chromium and tungsten

Displacement of tetrahydrofuran in [(CO)5M(THF)] (M /Cr, W) by the anion [C /C /C( /X)Y] (X /O; NR; Y /NR ? 2, Ph) followed by alkylation of the resulting metalate with [R ƒ 3 O]BF4 (R ƒ /Me, Et) offers a convenient and versatile route to p-donorsubstituted allenylidene complexes, [(CO)5M /C /C /C(XR ƒ)Y]. Allenylidene complexes in which the terminal carbon atom of the allenylidene ligand const...

Isolation of cationic and neutral (allenylidene)(carbene) and bis(allenylidene)gold complexes.

The one-electron reduction of a cationic (allenylidene)[cyclic(alkyl) (amino)carbene]gold(i) complex leads to the corresponding neutral, paramagnetic, formally gold(0) complex. DFT calculations reveal that the spin density of this highly robust coinage metal complex is mainly located on the allenylidene fragment, with only 1.8 and 3.1% on the gold center and the CAAC ligand, respectively. In ad...

Allylferrocenylselenide and the synthesis of the first seleno-substituted allenylidene complex: synthesis, spectroscopy, electrochemistry and the effect of electron transfer from the ferrocenylselenyl subunit

AlIylferrocenylselenide (2) is prepared from diferrocenyldiselenide (ISe) which was characterized along with its sulfur analog IS by X-ray structure analysis. In the crystal lattice the packing is determined by 'point-to-face' CH-"re interactions with close contacts between the CH re donors and cyclopentadienyl rings as the re acceptors. Compound 2 is then used in the trapping of the primary bu...