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New olefin metathesis methodology for the homologation of terminal olefins to protected α,β-unsaturated aldehydes is described. Acrolein acetals, including asymmetric derivatives, are robust cross-metathesis substrates as evidenced by reaction yields of 80-90% at catalyst loadings of 2-5 mol % (PCy 3 ) 2 Cl 2 Ru=CHPh (1).
A new method for the cross-metathesis of terminal olefins is described. Treatment of terminal olefins with 1-2 equivalents of a symmetric disubstituted cis or trans olefin and 5 mol% Cl 2 (PCy 3 ) 2 Ru=CHPh (1) in dichloromethane generates the desired cross-metathesis products in good yield.
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