| abstract |
WHEREIN R4 has the same meaning as described above. WHEREIN R1 represents a lower alkyl group, R2 represents R1O or an alkyl, aralkyl or aryl group, R3 represents an acyclic or cyclic alkyl or aryl group, and R4 represents a hydrogen atom, an alkyl, aralkyl or alkoxycarbonyl group or a halogen atom, which react with carbonyl compounds Reagents for aldehyde synthesis, particularly for formylolefination, of the general formula: |