| 摘要 |
The present invention is directed to substituted tetrahydropyrimidine derivatives of general formula (I) wherein R<1>, R<2>, R<3>, R<4>, R<5>, R<6> and R<7>, which may be the same or different are hydrogen or alkyl, aryl, cycloalkyl, alkaryl, aralkyl or heterocyclic, or substituted derivative thereof, R<6> or R<7> can additionally be -OH or -NR<8> wherein R<8> is hydrogen, alkyl, aryl, cycloalkyl, alkaryl, aralkyl or heterocyclic, or substituted derivative thereof, or R<6> and R<7> together can be =O or =NOH, and any two R groups on the same or adjacent carbon atoms can be joined in a cyclic configuration, and X is oxyl or hydroxy, it being provided that at least one of R<2> and R<3> and at least one of R<4> and R<5> are other than hydrogen. These compounds are used as polymerisation inhibitors for vinyl aromatic compounds. Compounds where X = hydroxy can also be used as polymer stabilisers.
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