Co-operative ortho-effects on the Wittig reaction. Interpretation of stereoselectivity in the reaction of ortho-halo-substituted benzaldehydes and benzylidenetriphenylphosphoranes
作者:Eoin C Dunne、Éamonn J Coyne、Peter B Crowley、Declan G Gilheany
DOI:10.1016/s0040-4039(02)00281-2
日期:2002.3
of the stilbenes 1 formed in the Wittigreaction of ortho-halo substituted benzyltriphenylphosphonium salts 2 and benzaldehydes 3 were determined. It was found that there is a co-operative effect of one ortho-halo group on each of the two reacting partners which increases Z-selectivity, but two such groups on the same reactant gives high E-selectivity. The effects are strong enough to be preparatively
Wittig Reaction in Deep Eutectic Solvents: Expanding the DES Toolbox in Synthesis
作者:Federica De Nardi、Giulia Gorreta、Carolina Meazzo、Stefano Parisotto、Marco Blangetti、Cristina Prandi
DOI:10.1002/chem.202402090
日期:2024.9.5
Wittigreaction was performed in Deep Eutectic Solvents with high yields, wide scope, facile TPPO (triphenyl phosphine oxide) removal and scalability of the process.