| abstract |
The present invention relates to compounds of formula (I) The compound is useful as a polymerization inhibitor and the like. Formula I In the above formula (I) R 1 and R 2 are each independently a monovalent hydrocarbon group, R 3 is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, X is a divalent hydrocarbon group, R 4 , R 5 and R 6 are each independently a monovalent organic group or a group represented by the following formula (II), provided that R 5 and R 6 may be together to form a divalent hydrocarbon group. Formula II In Formula II above, R 7 and R 8 are each independently a monovalent hydrocarbon group, R 9 is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. |