1. Introduction of DL-Cysteine

DL-Cysteine, with its CAS registry number is 3374-22-9, is one kind of white solid. And its product categories are Pharmaceutical Intermediates; Amino Acids. It has slight bad smell and sour taste. In addition, this chemical is soluble in water, acetic acid, ammonia and ethanol, insoluble in ether, benzene, acetone, ethyl acetate, carbon disulfide and carbon tetrachloride.

2. Properties of DL-Cysteine

Other characteristics of the DL-Cysteine can be summarised as followings: (1)ACD/LogP: 0.09; (2)# of Rule of 5 Violations: 0; (3)ACD/BCF (pH 5.5): 1; (4)ACD/BCF (pH 7.4): 1; (5)ACD/KOC (pH 5.5): 1; (6)ACD/KOC (pH 7.4): 1; (7)#H bond acceptors: 3; (8)#H bond donors: 3; (9)#Freely Rotating Bonds: 4; (10)Polar Surface Area: 102.12 Å²; (11)Index of Refraction: 1.55; (12)Molar Refractivity: 28.902 cm³; (13)Molar Volume: 90.783 cm³; (14)Polarizability: 11.458×10^-24cm³; (15)Surface Tension: 58.975 dyne/cm; (16)Density: 1.335 g/cm³; (17)Flash Point: 131.536 °C; (18)Enthalpy of Vaporization: 58.69 kJ/mol; (19)Boiling Point: 293.883 °C at 760 mmHg; (20)Vapour Pressure: 0 mmHg at 25°C.

3. Structure Descriptors of DL-Cysteine

You could convert the following datas into the molecular structure:
1).SMILES: C(C(C(=O)O)N)S
2).InChI: InChI=1/C3H7NO2S/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6)
3).InChIKey:XUJNEKJLAYXESH-UHFFFAOYAC

4. Production method of DL-Cysteine

With the raw materials DL-cysteine hydrochloride, the DL-Cysteine could be obtained after the neutrallzation reaction with alkali. The finished product could be got by a series of process filtering, drying, refining derived.

5. Uses of DL-Cysteine

The DL-Cysteine could react with dimethyl-(2-methyl-indol-3-ylmethyl)-amine, and obtain the 2-amino-3-(2-methyl-1H-indol-3-ylmethylsulfanyl)-propionic acid. This reaction needs the reagent of aq. NaOH. The yield is 68 %. In addition, this reaction should be taken for 0.5 hour. The other condition is heating.

6. Safety information of DL-Cysteine

Hazard Codes Xn,Xi
Risk Statements 20/21/22-36/37/38
Safety Statements 26-36-37/39
WGK Germany 3
RTECS HA1595000
F 8-10-23
HS Code 29309013

When you are using this chemical, please be cautious about it as the following: This chemical is irritating / harmful to eyes, respiratory system and skin. You should wear suitable protective clothing if you use it. In case of contacting with eyes, rinse immediately with plenty of water and seek medical advice.