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9,10-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) is an organophosphorus compound that is used to produce fire retardants. From the chemistry perspective, it is a derivative of hypophosphorous acid as well as a derivative of phenanthrene. The reactivity of the P-H center allows for the conjugation of DOPO to many monomers.
In 1010, Lý Công Uẩn published an edict explaining why he moved his capital to Dai La. [4] Lý Công Uẩn chose the site because it had been an earlier capital in the rich Red River Delta. He saw Đại La as a place "between Heaven and Earth where the coiling dragon and the crouching tiger lie, and his capital would last 10,000 years". [ 7 ]
Lý Tự Trọng (20 October 1914 in Thailand [1] – 21 November 1931 in Saigon; born Lê Hữu Trọng) was a Vietnamese revolutionary, executed by the French when he was only 17 years old. [2] He is considered to be a revolutionary martyr.