3,4,5,6-Tetrahydrophthalic anhydride

CAS 2426-02-0

Molecular formula C8H8O3,

molecular weight 152.15,

EINECS number 219-374-3

Melting point 69-73°C (lit.)

Boiling point 234.6°C (rough estimate)

Density 1.2000

) Storage conditions 2-8°C Solubility: Soluble in chloroform (small amount, sonicated),

DMSO (small amount)

Form: Crystalline powder

Color: White to creamy

Chemical Properties:

This product is a colorless, flaky crystal, m.p. 71–72℃, b.p. 140–150℃/0.67–1.2 kPa. It is sparingly soluble in water but soluble in organic solvents such as benzene, toluene, and ethanol. Uses: 3,4,5,6-Tetrahydrophthalic anhydride, abbreviated as Δ1, is an intermediate in the production of the insecticide pyrethroids.

The production method involves adding 1,2,3,6-tetrahydrophthalic anhydride and phosphorus pentoxide into a reactor, heating the mixture to a controlled temperature of 200°C. During the reaction, low-boiling substances are distilled off. After the reaction is complete, vacuum distillation is performed, and the fraction collected at 144–150°C/600 Pa is the 3,4,5,6-tetrahydrophthalic anhydride.

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