Process for stereoisomerization of cis-3-methyl-.DELTA..sup.4 -t

Details Process for stereoisomerization of cis-3-methyl-.DELTA..sup.4 -t Process for stereoisomerization of cis-3-methyl-.DELTA..sup.4 -t

1979-03-20

1980-04-15

Raymond, Richard

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D30789

Patent

active

041983408

ABSTRACT:
A process is provided for isomerizing (1) cis-3-methyl-.DELTA..sup.4 -tetrahydro-cis,cis-phthalic anhydride into (2) trans-3-methyl-.DELTA..sup.4 -tetrahydro-cis,cis-phthalic anhydride, which is its stereoisomer, by heating the compound (1) preferably at a temperature of 100.degree. to 250.degree. C. in the presence of an alkali metal compound such as lithium hydroxide, sodium hydroxide or sodium acetate. A mixture of said compounds (1) and (2) in a ratio by weight of 7:3 to 2:8 obtained by the isomerization reaction is liquid at room temperature and can be used advantageously as a curing agent for epoxy resins.

REFERENCES:
Craig, JACS, vol. 72, (1950), pp. 1678-1681.

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