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3,4-Dihydroxybenzaldehyde(cas 139-85-5) properties

Date : 2016/8/19 10:32:29

3,4-Dihydroxybenzaldehyde(cas 139-85-5) Physical properties:
Light beige needle crystals (water or toluene) or off-white powder, double-crystalline form. Melting point (m.p.) 153 ℃ ~ 154 ℃. K = 2.8 × 10-8 (25 ℃). Soluble in ethanol, acetone, ethyl acetate, ethyl ether and water, soluble in cold water, not soluble in benzene and chloroform. Solubility in water (g / 100m1): 5 (20 ℃); 33 (99 ℃); solubility in ethanol: 79 (78 ℃). It has cited moist, easily oxidized in the water discoloration. Pale yellow crystals, mp / 152 ~ 154 ℃ (decomposition when melted), dissolved in water, can also soluble in alcohol, ether, chloroform and other organic solvents.
Storage conditions: 2-8 ° C
Color: slightly brown
Water solubility: 50 g / L (20 & ordm; C)
Sensitivity: Air Sensitive
Merck: 14,7893
Detection methods: HPLC, NMR

BRN: 774381

3,4-Dihydroxybenzaldehyde(cas 139-85-5) Extraction Process:

Salvia herbs crushed, plus the amount of 12 times methanol, soaked overnight, ultrasonic extraction, 3500 rpm / centrifuged, the supernatant through a polyamide column and eluted with 20% alcohol, ethyl acetate extraction, purification, crystallization content of about 98%.

3,4-Dihydroxybenzaldehyde(cas 139-85-5) Chemical identification:

Take 3,4-dihydroxybenzaldehyde(cas 139-85-5) 0.1g, plus ethanol to dissolve, as the test solution. Take protocatechuic aldehyde reference substance, add ethanol made solution containing 1mg per 1ml, as the reference solution. Thin layer chromatography (Appendix ⅥB) test, to learn the two solutions of 2 ~ 5μl, respectively, points on the same silica gel G plate with benzene - ethyl acetate - formic acid (8: 5: 0.8) as the agent , started out, dried, sprayed with 2% ferric chloride 1% potassium ferricyanide solution (1: 1). Test products for chromatography, chromatography with reference substance corresponding position, was the same color spots.