Related Experiment Video
Updated: Jun 26, 2026

Synthesis of Hypervalent Iodonium Alkynyl Triflates for the Application of Generating Cyanocarbenes
Published on: September 8, 2013
Reactions of aquatitanium(II) with hypervalent chromium species
Basab Bijayi Dhar1, Ritam Mukherjee, Edwin S Gould
1Department of Chemistry, Kent State University, Kent, Ohio 44242, USA.
Abstract:
Titanium(ii) solutions, prepared by dissolving titanium metal in triflic acid and HF, react readily with derivatives of Cr(vi), Cr(v) and Cr(iv). Reductions of Cr(vi) and Cr(iv), carried out with [Co(NH(3))(5)Br](2+) as a scavenger for Cr(ii), yield no detectable Co(2+), indicating that 2e(-) steps, bypassing Cr(v) and Cr(iii), are not operative. Catalysis by Ti(iv) is observed only for reduction of Cr(vi). Rates for reduction by Ti(iii) are remarkably similar to those for the corresponding reductions by Ti(ii). The addition of Ti(iii) to triflic acid and HF results in rapid and quantitative disproportionation to Ti(ii) and Ti(iv).
Related Concept Videos
Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation reactions,...
Properties of Transition Metals
Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction
Redox Titration: Other Oxidizing and Reducing Agents
Radical Reactivity: Concentration Effects
Radical Substitution: Allylic Chlorination

