35948-25-5Relevant articles and documents
Thermogravimetric analysis study of a cyclic organo-phosphorus compound
Chang,Wu,Wu,Chiu
, p. 45 - 55 (1998)
Four methods were used to study the thermal cyclisation of 2-(2-hydroxyphenyl)-phenylphosphonous acid 3, and the results were compared with the thermal decomposition of 9,10-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO). The decomposition of DOPO was found to be a simple process composed of at least one stage for which apparent activation energies can be calculated. These investigated methods were those of van Krevelen, Horowitz-Metzger, Coats-Redfern, and MacCallum-Tanner. These methodologies evaluated the similar apparent activation energies Ea for cyclisation of 3 and for decomposition of DOPO. Moreover, these apparent activation energies for decomposition of DOPO were compared with that calculated by the isothermal method.
Method for synthesizing 9, 10-dihydro-9-oxygen-10-phosphaphenanthrene-10-oxide
-
Paragraph 0003; 0015; 0052; 0059-0060, (2018/02/04)
The invention discloses a method for synthesizing 9, 10-dihydro-9-oxygen-10-phosphaphenanthrene-10-oxide. The method includes adding phosphorus trichloride into excessive o-phenylphenol drop by drop and carrying out esterification reaction to obtain phosphorous acid tri-orthophthalic phenyl ester; adding ZnCl2 catalysts into the phosphorous acid tri-orthophthalic phenyl ester, adding phosphorus trichloride into the phosphorous acid tri-orthophthalic phenyl ester drop by drop and carrying out acylation reaction to obtain 6-chlorine-(6 hydrogen)-dibenzo-(c, e)-oxygen phosphorus heterocyclic hexa-rings; sequentially carrying out hydrolysis reaction and cyclization reaction on the 6-chlorine-(6 hydrogen)-dibenzo-(c, e)-oxygen phosphorus heterocyclic hexa-rings to obtain the 9, 10-dihydro-9-oxygen-10-phosphaphenanthrene-10-oxide. The method has the advantages that the o-phenylphenol can be prevented from being volatilized or oxidized at high temperatures, the method is high in reaction speed and suitable for industrial production, and target products are high in yield and purity.
METHOD FOR SYNTHESIZING 9,10-DIHYDRO-9-OXA-10-PHOSPHAPHENANTHRENE-10-OXIDE AND DERIVATIVES THEREOF
-
Page/Page column 3, (2011/02/26)
A method for synthesizing 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide or its derivatives has a step of introducing 6-chloro-6H-dibenz[c,e][1,2]oxaphosphorin or its derivative, an acid compound and water into a reacting chamber to form an organic layer having 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide or its derivative and an aqueous layer. Because the acid compound is from an external source and has a catalyzing effect, employing the method can prevent side reaction from occurring and increase yield of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide or its derivative. Furthermore, the method is a one-pot operation of hydrolysis, dehydration and cyclization, so the method does not require purification of intermediates. Therefore, the method is time-and cost-saving and requires less organic solvent, resulting in less pollution to the environment.