Methyl yellow Methyl yellow

Structural formula

• Numbering system
• Physical property data
• Toxicological data
• Ecological data
• Molecular structure data
• Computing chemical data
• More
  • Properties and Stability
  • Storage method
  • Synthesis method
  • Purpose

Numbering system

CAS number:60-11-7

MDL number:MFCD00008308

EINECS number:200-455-7

RTECS number:BX7350000

BRN number:746016

PubChem number:24859947

Physical property data

1. Properties: golden flakes or orange-yellow powder.

2. Density (g/mL, 25/4℃): Undetermined

3. Relative vapor density (g/mL, air=1): Undetermined

4. Melting point (ºC): 114～117

5. Boiling point (ºC, normal pressure): Undetermined

6. Boiling point (ºC, 5.2kPa): Not determined

7. Refractive index: Not determined

8. Flash point (ºC): Not determined

9. Specific rotation (º): Not determined Determined

10. Autoignition point or ignition temperature (ºC): Not determined

11. Vapor pressure (kPa, 25ºC): Not determined

12. Saturated vapor pressure (kPa, 60ºC): Undetermined

13. Heat of combustion (KJ/mol): Undetermined

14. Critical temperature (ºC): Undetermined

15. Critical pressure (KPa): Undetermined

16. Log value of oil-water (octanol/water) partition coefficient: Undetermined

17. Explosion upper limit ( %, V/V): Undetermined

18. Lower explosion limit (%, V/V): Undetermined

19. Solubility: soluble in ethanol, benzene, chloroform, Diethyl ether, petroleum ether, strong acids and oils are insoluble in water.

Toxicological data

None yet

Ecological data

None yet

Molecular structure data

1. Molar refractive index: 71.66

2. Molar volume (cm³/mol): 219.4

3. Isotonic specific volume (90.2K): 543.9

4.   Surface tension (dyne/cm): 37.7

5. Polarizability (10^-24cm³): 28.40

Compute chemical data

1. Reference value for hydrophobic parameter calculation (XlogP): 4.6

2. Number of hydrogen bond donors: 0

3. Number of hydrogen bond acceptors: 3

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4. Number of rotatable chemical bonds: 3

5. Number of tautomers:

6. Topological molecular polar surface area (TPSA): 28

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7. Number of heavy atoms: 17

8. Surface charge: 0

9. Complexity: 236

10. Number of isotope atoms : 0

11. Determine the number of atomic stereocenters: 0

12. Uncertain number of atomic stereocenters: 0

13. Determine the chemical bond configuration Number of centers: 0

14. Number of uncertain chemical bond stereocenters: 0

15. Number of covalent bond units: 1

Properties and stability

None yet

Storage method

This product should be sealed and stored away from light.

Synthesis method

1. Slowly add aniline to the concentrated hydrochloric acid with crushed ice to mix evenly. Control the temperature to 0~5℃, and stir the aniline into the concentrated hydrochloric acid with crushed ice. Sodium nitrate is added dropwise to the hydrochloric acid solution of aniline to perform diazotization reaction:

Afterthereactioniscompleted,addtheprepareddimethylanilineandmaintainWhenthetemperatureisbelow5°C,addindustrialsodiumacetatewhilestirring.Afterstirringfor3hours,addasmallamountofsodiumacetatetocarryoutthereaction:

Let it stand and then filter. The yellow crystals are dried first and then recrystallized with toluene and ethanol. , the finished product dimethyl yellow can be obtained.

Purpose

1. Acid-base indicator, pH 2.9 (red) ~ 4.0 (yellow). Determination of free hydrochloric acid in gastric juice. Spot test for peroxidized fats. For titration of non-aqueous solutions.