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.
Superacid-catalyzed Friedel–Crafts phosphination of 2-hydroxybiphenyls with phosphorus trichloride
Ito, Takatoshi,Iwai, Toshiyuki,Nakai, Takeo,Mihara, Masatoshi,Mizuno, Takumi,Ohno, Toshinobu,Ishikawa, Akira,Kobayashi, Jun-ichi
, p. 336 - 342 (2016/10/11)
Cyclic phosphorus compounds, 6H-dibenz[c,e][1,2]oxaphosphorin-6-oxide derivatives, were efficiently synthesized by the Friedel–Crafts reaction of 2-hydroxybiphenyls with phosphorus trichloride in the presence of superacids, especially trifluoromethanesulfonic acid (TfOH) as a catalyst. TfOH was investigated for the first time as an effective catalyst for the aromatic phosphination of 2-hydroxybiphenyls.
METHOD FOR SYNTHESIZING 9,10-DIHYDRO-9-OXA-10-PHOSPHAPHENANTHRENE-10-OXIDE AND DERIVATIVES THEREOF
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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.