Cover Feature: Chemoselective Synthesis of α,β-Unsaturated Silyl Esters and Silyl Phosphonates over Cyclopropanation (Eur. J. Org. Chem. 39/2025)

The Cover Feature illustrates the synthesis of α,β-unsaturated silyl esters and silyl phosphonates from α-diazo esters, and α-diazo phosphonate esters with allyl trimethyl silane in the presence of a catalyst. The sun symbolizes the catalyst, [Ru(Cp)*Cl₂]_n, which activates the trees and the canal through which acetonitrile and allyl trimethyl silane flow. These substances are absorbed by the trees next to the canal, along with fertilizer (diazo), to produce as fruits α,β-unsaturated silyl esters at 0 °C (right) and α,β-unsaturated silyl phosphonates at 50 °C (left). More information can be found in the Research Article by C. Sivasankar and co-workers (DOI: 10.1002/ejoc.202500133).