| 摘要 |
KOE 88/F 370 Process for the preparation of organophosphorus derivatives 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 derivatives 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 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 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) chlorophosphite. 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.
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