Tris- and tetrakis-phthalyl-silanes, useful as crosslinking agents - by oxidn. of the corresp. tris- and tetrakis-(3,4- di:methylphenyl)-silane, followed by reaction with acetic anhydride

    公开(公告)号:DE4229086A1

    公开(公告)日:1994-03-03

    申请号:DE4229086

    申请日:1992-09-01

    Applicant: HOECHST AG

    Abstract: Cpds. of formula (I) are new. In formula (I) R1 = Ar, Ar'-Phe-, 1- or 2-naphthyl, Ar'-R4-Phe-, alkyl (pref. 1-12C alkyl), or a gp. of formula (X) (with Ar = phenyl substd. with R2 and R2 with R2, R3 = H, tert.-Bu or OMe; Ar' = phenyl substd. with R2; Phe = 1,4-phenylene; R4 =O or (CH2)n with n = 1-3). Also claimed are processes for the prodn. of (I), (a) by oxidn. of the corresp. 3,4-xylyl cpd. of formula R1Si(xylyl)3 (II) (with xylyl = 1-(3,4-dimethylphenyl); R1 = as above except for X), or (b) (with R1 = X), by oxidn. of Si(xylyl), (III) and reaction with Ac2O. Also claimed are (i) cpds. of formula (I) with R1 = as above or also xylyl; and (ii) the prodn. of (II) and (III) by reaction of R1SiCl3 with R1 not = X or SCl4 respectively with a xylyl Grignard reagent or xylyl-Li. USE/ADVANTAGE - (I) are useful as crosslinking reagents for amino or OH gp.-contg. cpds., and cpds. (II) are useful as starting materials for prodn. of (I) (claimed). Applications include hardeners for paints, resins and plastics, esp. epoxy resins, hardeners for reaction adhesives, and textile finishing. The invention enables the prodn., in high yield, of cpds. (I) with at least 3 phthalic acid or anhydride gps..

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