Malonaldehyde bis(phenylimine) monohydrochloride → HCID 86614813, compound

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Reaction Steps

1-Ethyl-2,3-dimethyl-3-(4-sulphobutyl)-3H-indolium-5-sulphonate, crude (1.1 g), malonaldehyde bis(phenylimine) HCl (0.5 g) and acetic acid (20 ml) were heated under nitrogen at 130° C. for 8 hrs to give a dark orange-red solution. The solvent was then evaporated under vacuum; the residue was partitioned in a water/dichloromethane/methanol mixture. UV/Vis is analysis (ethanol) confirmed the presence of the product in the upper, aqueous layer (λmax=524 nm) while the malonaldehyde starting material was present only in the lower, organic layer (λmax=384 nm). The aqueous layer was evaporated under vacuum and purified by HPLC (water/0.1% TFA and acetonitrile/0.1% TFA eluants). Fractions containing the product were pooled and evaporated, with final drying under high vacuum over phosphorus pentoxide to give the title product.

Provenance & Evidence