Toluene diisocyanate manufacturer Knowledge 4-Chlorobenzaldehyde 4-Chlorobenzaldehyde

4-Chlorobenzaldehyde 4-Chlorobenzaldehyde

4-Chlorobenzaldehyde Structural Formula

Structural formula

Business number 02QW
Molecular formula C7H5ClO
Molecular weight 140
label

p-chlorobenzaldehyde,

p-chlorobenzaldehyde

Numbering system

CAS number:104-88-1

MDL number:MFCD00003379

EINECS number:203-247-4

RTECS number:CU5076000

BRN number:385858

PubChem number:24854064

Physical property data

1. Properties: colorless to light yellow flake crystals or powder

2. Density (g/mL, 25℃): 1.196

3. Relative density (25 ℃, 4℃): 1.19661

4. Melting point (ºC): 48

5. Boiling point (ºC, normal pressure): 214

6. Refractive index at room temperature (n25): 1.55561

7. Refractive index: 1.5552

8. Flash point (ºC): 87

9. Crystal phase standard claims heat (enthalpy) (kJ·mol-1): -146.4

10. Autoignition point or ignition temperature (ºC): 395

11. Vapor pressure (mmHg, 20.2ºC): Undetermined

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

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

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

19. Solubility: Easily soluble in ethanol, ether and benzene, soluble in water and acetone.

Toxicological data

Acute toxicity: Rat oral LD50: 1575mg/kg; Rat inhalation LC: >473mg/m3/4H; Mouse oral LD50: 1400mg/kg;

Ecological data

It is extremely harmful to water and toxic to fish. Do not let the product enter the water body.

Molecular structure data

1. Molar refractive index: 37.90

2. Molar volume (cm3/mol): 113.0

3. Isotonic specific volume (90.2K ): 288.2

4. Surface tension (dyne/cm): 42.2

5. Dielectric constant:

6. Dipole moment (10-24cm3):

7. Polarizability: 15.02

Compute chemical data

1. Reference value for hydrophobic parameter calculation (XlogP): None

2. Number of hydrogen bond donors: 0

3.�Number of �� bond acceptors: 1

4. Number of rotatable chemical bonds: 1

5. Number of tautomers: None

6. Topology Molecular polar surface area 17.1

7. Number of heavy atoms: 9

8. Surface charge: 0

9. Complexity: 95.1

10. Number of isotope atoms: 0

11. Number of determined atomic stereocenters: 0

12. Number of uncertain atomic stereocenters: 0

13. Determine the number of stereocenters of chemical bonds: 0

14. Uncertain number of stereocenters of chemical bonds: 0

15. Number of covalent bond units: 1

Properties and stability

Avoid contact with oxidants, air, and light.

Storage method

Store in a cool, ventilated warehouse. Keep away from fire and heat sources. should be kept away from oxidizer, do not store together. Store away from air and away from light. Equipped with the appropriate variety and quantity of fire equipment. The storage area should be equipped with emergency release equipment and suitable containment materials.

Synthesis method

(1) by parachlorine Obtained by chlorine hydrolysis of toluene: Add p-chlorotoluene and phosphorus trichloride to the reaction pot, and heat it to 155℃, pass in chlorine gas. Control the temperature at160-170℃, pass chlorine to the calculated amount to obtain chlorinated liquid. Add it to concentrated sulfuric acid while stirring, and stir at room temperature 5h. Let stand and separate into layers. Remove the layer and put it into ice water for crystallization. Cool to Filter below 5℃. The filter cake is washed with ice water to obtain a crude product, which is distilled under reduced pressure and collected108-111℃ (3.33kPa) fraction is Get the finished product.

(2) p-chlorotoluene manganese dioxide oxidation method: first add p-chlorotoluene to the reaction pot, then add 70% Sulfuric acid, slowly add manganese dioxide below 70℃. After the addition is completed, react for 0.5h, and then steam distillation. In addition, p-chlorobenzaldehyde can also be obtained by oxidizing p-chlorotoluene with air.

Purpose

Used as pharmaceutical and dye intermediates, in the manufacture of fenalol, aminobutyric acid, etc.

This article is from the Internet, does not represent the position of Toluene diisocyanate reproduced please specify the source.https://www.chemicalchem.com/archives/25208

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