1. alpha-Amylcinnamaldehyde; Amyl cinnamic aldehyde; alpha-amyl-beta-phenyl-acrolein; 2-Benzylidene heptanal; alpha-Pentyl-cinnamaldehyde

2. or OH, R = C¿1?-C¿9? alkylene, C¿3?-C¿6? cycloalkylene or benzylidene and R?

3. Hydrogen [4-[4-(dimethylamino)-.alpha.-(2-hydroxy-3,6-disulphonato-1-naphthyl)benzylidene]cyclohexa-2,5-dien-1-ylidene]dimethylammonium, monosodium salt

4. Treatment of methyl 3,4-O-(S′)-benzylidene-β-D-ribopyranoside (4) with acid resulted in the immediate formation of the equilibrium mixture of pyranoside acetals.