1,2-Acyl migration with α-imino rhodium carbenoids leading to substituted 1-naphthols.

A unique method for the synthesis of substituted 1-naphthols by a rhodium(II)-catalysed ring-expansion reaction of 2-triazolyl-1-indanone derivatives is reported. 1,2-Acyl migration occurs with an intermediate α-imino rhodium carbenoid generated from the triazolyl moiety.

Synthesis, Structure, and Dynamics of Chiral Eight-Membered Cyclic Molecules with Thienylene and Cyclopropylene Units Alternately Connected.

A rhodium(II)-catalyzed asymmetric cyclooligomerization of bifunctional monomers possessing triazolyl and vinyl groups at 2,3- and 3,4-positions on the thiophene ring is studied. Structurally interesting cyclic dimers in which thienylene and cyclopropylene units are alternately connected are obtained as the major components. The eight-membered rings in the center are non-planar and adopt a tub-shaped conformation.

Structural elucidation of a methylenation reagent of esters: synthesis and reactivity of a dinuclear titanium(iii) methylene complex.

Transmetallation of a zinc methylene complex [ZnI(tmeda)](μ-CH) with a titanium(iii) chloride [TiCl(tmeda)(thf)] produced a titanium methylene complex. The X-ray diffraction study displayed a dinuclear methylene structure [TiCl(tmeda)](μ-CH)(μ-Cl). Treatment of an ester with the titanium methylene complex resulted in methylenation of the ester carbonyl to form a vinyl ether.

Correction: Cyclization of 5-alkynones with chromium alkylidene equivalents generated in situ from gem-dichromiomethanes.

Correction for 'Cyclization of 5-alkynones with chromium alkylidene equivalents generated in situ from gem-dichromiomethanes' by Masahito Murai et al., Chem. Commun.

Cyclization of 5-alkynones with chromium alkylidene equivalents generated in situ from gem-dichromiomethanes.

A rare example of cyclization with 5-alkynones, which possess non-polar alkynyl and less electrophilic polar keto carbonyl groups, was demonstrated. The key to promoting carbene/alkyne metathesis followed by alkylidenation with pendant C[double bond, length as m-dash]O double bonds was the Schrock-type nucleophilic reactivity of the generated chromium carbene equivalents from readily available diiodomethanes and CrCl by simple heating.