C - Chemistry – Metallurgy – 07 – F
Patent
C - Chemistry, Metallurgy
07
F
C07F 9/547 (2006.01) C07F 3/02 (2006.01) C07F 9/40 (2006.01) C07F 9/48 (2006.01) C08K 5/5393 (2006.01)
Patent
CA 2006077
KOE 88/F 370 Abstract Process for the preparation of organophosphorus deriva- tives of 2,4-di-tert-butylphenol, of 4,4'-dihalomagnesium compounds of biphenyl and the use of the organophosphorus derivatives for the stabilization of plastics A process for the preparation of organophosphorus deriva- tives of 2,4-di-tert-butylphenol with a high proportion of organophosphorus derivatives of biphenyl, which comprises reacting, in a first step, 4,4'-dihalobi- phenyl whose halogen has an atomic weight of at least 35, under Grignard conditions with magnesium to form the corresponding Grignard compound and this is further reacted in a second step with bis(2,4-di-tert-butyl- phenyl) chlorophosphite of the formula IV Image IV with the formation of a mixture in which at least 50% by weight of the phosphorus is combined in the form of tetrakis(2,4-di-tert-butylphenyl) 4,4'-biphenylene- diphosphonite of the formula I Image I, the bonding of the phosphorus being determined by 31P-NMR analysis. The invention further relates to a polyolefin molding composition containing tetrakis(2,4-di-tert-butylphenyl) 4,4'-biphenylenediphosphonite of the formula I which was prepared by reaction of a 4,4'-dihalobiphenyl whose halogen has an atomic weight of at least 35 with magnesium to form the Grignard compound and by subsequent HOE 88/F 370K reaction with bis(2,4-di-tert-butylphenyl) chloro- phosphite. The molding composition has improved properties relative to those molding compositions which contain the said phosphonite prepared by the prior art. The invention furthermore relates to a process for the preparation of 4,4'-dihalomagnesium compounds of biphenyl by reacting a 4,4'-dihalobiphenyl whose halogen has an atomic weight of at least 35 with magnesium in the absence of an entrainer, during which a 4,4'-dihalobi- phenyl whose halogen has an atomic weight of at least 35 is reacted with fine-particle magnesium which is held in suspension.
Bohshar Manfred
Kleiner Hans-Jerg
Pfahler Gerhard
Waldmann Karl
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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