Piperonal → HCID 68843936, compound

Participants

Reaction Conditions

Reaction Steps

A suspension of 2,7-bis(diethylphosphonatomethyl)-9,9-dipropylfluorene (4) (2.70 g, 5 mmol), 3,4-methylenedioxybenzaldehyde (7) (1.60 g, 11 mmol) and potassium hydroxide (0.85 g, 15 mmol) in THF (30 mL) and DMSO (1 mL) was heated at 70° C. for 7 hours. The suspension was diluted with Ethanol (50 mL) and the solvent removed under vacuum. The product was purified by refluxing in Methanol followed by filtration. After drying, (II-5) was obtained as a pale yellow powder (1.95 g, 72%). The UV/VIS spectrum of (II-5) in methyl ethyl ketone (MEK) has two maxima at 382 nm and at 401 nm with a molar extinction coefficient of 79099 Mol−1 cm−1 and 63911 Mol−1 cm−1 respectively. Under UV irradiation (II-5) shows a strong blue fluorescence. The 1H-NMR data in CDCl3 are summarized in table 3.

Provenance & Evidence