(L)-Ephedrine

CAS RN: 299-42-3

Other Properties

Boiling point = 255 deg C (decomposes)
pKa = 10.25 at 0 deg C
Unctuous to touch ... hygroscopic, gradually decomposes on exposure to light
Mol wt: 201.69. Fine, white, colorless crystals or powder, affected by light, mp 217-220 deg C. Odorless. Specific optical rotation: -33 to -35.5 deg ar 25 deg C/D ( c = 5). Freely soluble in water, soluble in alcohol. Practically insoluble in ether. /Ephedrine hydrochloride/
Mol wt: 428.55. Fine, white, odorless crystals or powder. Darkens on exposure to light, mp 245 deg C (decomposes). Specific optical rotation: -30 to -32.5 deg ar 25 deg C/D ( c = 5). Freely soluble in water; sparingly soluble in alcohol. /Ephedrine sulfate/
Crystals from chloroform-petroleum ether, mp 75 deg C. Soluble in water, alcohol, ether, chloroform, oils. /dl-Ephedrine/
1 g dissolves in 1.2 mL water, 95 L alcohol; freely soluble in hot alcohol /L-Ephedrine sulfate/
Crystals from alcohol-acetone, mp 189 deg C. One gram dissolves in 4 mL water, in about 40 mL of 95% alcohol at 20 deg C. Practically insoluble in ether. pH about 6. /dl-Form, hydrochloride/
May contain up to 1/2 mole H2O (5.2%)
Absorption of water raises the mp to 40 deg C.
(+)-threo-Form, ... pseudoephedrine
Henry's Law constant = 8.7X10-11 atm-cu m/mol at 25 deg C (est)
Hydroxyl radical reaction rate constant = 1.0X10-10 cu cm/molec-sec at 25 deg C (est)
Find more information on this substance at: PubChem, PubMed