4-Methylphthalic anhydride → Isoprene

HRID 1155481Notes

Reaction equation

[CH3:1][C:2]1[CH:3]=[C:4]2[C:9](=[O:10])[O:8][C:6](=[O:7])[C:5]2=[CH:11][CH:12]=1.[S].CC1C=CC2C(OC(=O)C2C1)=O>>[CH2:11]=[CH:12][C:2](=[CH2:1])[CH3:3].[C:6]1(=[O:7])[O:8][C:9](=[O:10])[CH:4]=[CH:5]1

Participants

Reactant 3

HCID 880694-Methylphthalic anhydride

HCID 5362487Sulfur

HCID 12726604Tetrahydro-4-methylphthalic anhydride

Product 2

HCID 6557Isoprene

HCID 7923Maleic Anhydride

Procedure

4-Methylphthalic anhydride is also able to be prepared by dehydrogenation, with sulfur, of tetrahydro-4-methylphthalic anhydride obtained from the reaction between isoprene and maleic anhydride: ##STR4##

Sources & evidence

ORD record: ord-a68eb8af74494a68a8c98191dc52d72b
Source dataset: uspto-grants-1981_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04302396

Reaction notes

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