Expanding the Reactivity of Rosenthal's Reagent to Cyclopropenes and Allenes

Key Points

• To explore the reactivity of Rosenthal's reagent with cyclopropenes and allenes, specifically focusing on ring expansion phenomena.
• Systematic investigation of reactions involving Rosenthal reagent Cp₂Ti(η²-BTMSA) with cyclopropenes and allenes.
• Analysis of selective 1,2-insertion mechanisms in the Ti-C bond.
• The reaction with cyclopropenes results in selective 1,2-insertion causing ring expansion from three-membered to five-membered structures.
• Similar reactivity patterns were observed with allenes, indicating expanded utility of Rosenthal's reagent.