| abstract |
The present invention provides an aminomethylene derivative represented by general formula (I), a preparation method thereof, and a use thereof.n n n n n n n n In the above formula, A is a cyclic oxo group selected from the group consisting of the following general formulas (a), (b), (c), (d) and (e),n n n n n n n n (In the above formulas (a) to (e), R 1 , R 2 , R 3 , R 4 , and R 5 each independently represent H, an alkyl group, etc., and R 6 , R 7, and R 8 are independent of each other. To an alkyl group, and R 1 , R 2 , R 7, and R 8 may together form a tetramethylene group, and n is an integer of 0 to 4;n n n R represents the alkyl group which may contain OH, O, etc.n n n This derivative has excellent ultraviolet absorption and high photostability. |