Epoxy curing agent Knowledge DL-Pantoyl Lacyone DL-Pantoyl Lacyone

DL-Pantoyl Lacyone DL-Pantoyl Lacyone

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DL-pantoyl lactone structural formula

Structural formula

Business number 01Q1
Molecular formula C6H10O3
Molecular weight 130.14
label

DL-2-hydroxy-3,3-dimethyl-4-butyrolactone,

DL-α-Hydroxy-β,β-dimethyl-γ-butyrolactone,

Dihydro-3-hydroxy-4,4-dimethyl-2(3H)-furanone,

DL-Pantolactone

Numbering system

CAS number:79-50-5

MDL number:MFCD00064333

EINECS number:201-210-7

RTECS number:None

BRN number:80958

PubChem number:24879247

Physical property data

1. Characteristics: deliquescent columnar crystals.


2. Density (g/mL,25/4℃): Unsure


3. Relative vapor density (g/mL,AIR=1): Unsure


4. Melting point (ºC):80 ℃


5. Boiling point (ºC,Normal pressure):130℃ 2.4kPa)


6. Boiling point (ºC,5.2kPa): Unsure


7. Refractive index: Uncertain


8. Flash point (ºC): Unsure


9. Specific optical rotation (º): Unsure


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


11. Vapor pressure (kPa,25ºC): Unsure


12.3. Isotonic specific volume (90.2K): 277.4


4. Surface Tension (dyne/cm):38.1


5. Polarizability10-24cm3):12.32

Compute chemical data

1. Reference value for hydrophobic parameter calculation (XlogP): 0.5

2. Number of hydrogen bond donors: 1

3. Number of hydrogen bond acceptors: 3

4. Number of rotatable chemical bonds: 0

5. Number of tautomers: 3

6. Topological molecule polar surface area 46.5

7. Number of heavy atoms: 9

8. Surface charge: 0

9. Complexity: 139

10. Number of isotope atoms: 0

11. Determine the number of atomic stereocenters: 0

12. Uncertain number of atomic stereocenters: 1

13. Determine the number of chemical bond stereocenters: 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 in a cool place.

Synthesis method

Produced from isobutyraldehyde2,2-Dimethyl-3-After adding hydroxypropionaldehyde with sodium cyanide, it is obtained by hydrolysis, acidification and lactonization. 2,2- Dimethyl-3- Dissolve hydroxypropionaldehyde in water, put it into the reaction pot, and then add sodium cyanide aqueous solution and calcium chloride aqueous solution. Stir well and add 50% sulfuric acid solution. The reaction produces highly toxic hydrogen cyanide tail gas, which is absorbed by ferrous sulfate solution. At60-65℃ Reaction6hAfter that, heat up To80-85℃ Reaction3h, reduce stress Concentrate, add 95%95% -SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-font-kerning: 0pt; mso-bidi-font-family: Arial”> Ethanol precipitates inorganic salts. Filtration, the filtrate is decompressed to recover ethanol and then fractionated to collect130-145 ℃1.33-2.44 kPa) fraction, get DL-Panthenolactone.

Purpose

This product is an intermediate of pantothenic acid and is also used in other organic synthesis.

Arial; mso-font-kerning: 0pt”>-3-Hydroxypropionaldehyde is added with sodium cyanide, and then hydrolyzed, acidified, and lactonized to obtain it.2,2-Dimethyl -3-hydroxypropyl Dissolve the aldehyde in water, put it into the reaction pot, then add sodium cyanide aqueous solution and calcium chloride aqueous solution. Stir evenly and add 50%sulfuric acid solution. The reaction produces highly toxic hydrogen cyanide tail gas, which is absorbed by ferrous sulfate solution. At60-65℃ Reaction6hAfter that, heat up To80-85℃ Reaction3h, reduce stress Concentrate, add 95%95% -SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-font-kerning: 0pt; mso-bidi-font-family: Arial”> Ethanol precipitates inorganic salts. Filtration, the filtrate is decompressed to recover ethanol and then fractionated to collect130-145 ℃1.33-2.44 kPa) fraction, get DL-Panthenolactone.

Purpose

This product is an intermediate of pantothenic acid and is also used in other organic synthesis.

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