Organic compounds -- part of the class 532-570 series – Organic compounds – Phosphorus esters
Reexamination Certificate
2011-06-21
2011-06-21
Kosack, Joseph R (Department: 1626)
Organic compounds -- part of the class 532-570 series
Organic compounds
Phosphorus esters
C558S122000, C562S019000
Reexamination Certificate
active
07964750
ABSTRACT:
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.
REFERENCES:
patent: 4086206 (1978-04-01), Saito et al.
patent: 5391798 (1995-02-01), Kleiner
patent: 5481017 (1996-01-01), Kleiner
patent: 5650530 (1997-07-01), Buysch et al.
patent: 5821376 (1998-10-01), Rathfelder et al.
patent: 6107506 (2000-08-01), Saito et al.
patent: 101108864 (2008-01-01), None
patent: 19505352 (1996-03-01), None
patent: 19505353 (1996-03-01), None
patent: 582957 (1994-02-01), None
patent: 739896 (1998-02-01), None
Merriam-Webster Online Dictionary entry for “derivative”, (http://www.merriam-webster.com/dictionary/derivative), last accessed May 12, 2010.
Wang, Chun-Shan et al., Synthesis and properties of epoxy resins containing 2-(6-oxid-6H-debenz[c,e][1,2] oxaphosphorin-6-y1) 1,4-benzenediol, Polymer, vol. 39: pp. 5819-5826, 1998, Elsevier Science Ltd.
Fan Chung-Ning
Huang Kai-Chiang
Lee Yu-Cheng
Lee Yu-Chin
Lo Tien-Wen
Coughlin Matthew P
King Anthony
Kosack Joseph R
UFC Corporation
WPAT, P.C.
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