| http://www.w3.org/ns/prov#value | - The present invention relates to a method for producing a phosphonite compound containing phosphinobiphenylene of the formula (I???): wherein R is a hydrogen atom or methyl and R1 and R2 are each a hydrogen atom or alkyl having 1 to 5 carbon atoms [hereinafter to be also referred to as phosphinobiphenylene of the formula (I???)], which is useful as a stabilizer of organic polymer materials, and to
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