Thianthrene-containing

A brownish-purple solid salt, T SbCls, made by reacting thianthrene with antimony(V) chloride at room temperature in chloroform (62BCJ1137, 62JCS4963 67BCJ2539), was shown, by comparison with a methylene chloride solution of the salt, to have the radical as free in the solid as in solution (69BCJ548). Antimony(V) chloride was used to oxidize a thianthrene-containing polymer, —[T—C(Ph)=C(Ph) presumably... 

A series of thianthrene-containing triosmium clusters has been prepared (62-64). The electron deficient complex 63 (L = CO) reversibly adds CO to give 64 and reacts with PPh3 to give 63 (L = PPh3).42... 

M. Yoneyama, R. A. Johnson, and L. J. Mathias. Thianthrene-containing polyimides with monomer formation via nncleophiUc aromatic substitution. J. Polym. Set, Part A Polym. Chem., 33 1891-1899,1995. 

R.A. Johnnson, L.J. Mathis, Synthesis and characterization of thianthrene-containing poly(benzoxazole)s, J. Polym. Sci. Part A Polym. Chem. 33 (11) (1995) 1901-1906. 

Thianthrene-Containing Polymers Polyimides, Aramids, and Polybenzoxazoles... 

New thianthrene-containing PBOs were synthesized by the polycondensation reaction of thianthrene dicarbonyl chlorides witii bis-o-aminophenols in PPA. The PBOs exhibit high glass transition temperatures and good thermal stabilities. No solubility improvements were observed but films were transparent and tough. 

Thianthrene-containing polyamides have also been prepared by reacting thianthrene-2,7-dicarboxylic acid chloride with aromatic and aliphatic diamines at low-temperature. The polymerization of thianthrene-2,7-dicarboxylic acid chloride and 1,4-phenylenediamine yielded 81% polyamide with an inherent viscosity of 0.75 dL/g, although no other polymers or characterization results were discussed. 

Thianthrene-containing polyamides were also prepared by converting thianthrene-containing polyketones to polyamides by Schmidt and Beckmaim rearrangements. These polymers derived had lower inherent viscosities relative to those prepared by the low-temperature reaction of diamines and diacid chlorides. 

Overall goals of our research in this area include synthesis of thianthrene di-, tri- and tetracarboxylic acid derivatives (10,11,12,13 Figure 7) starting with 3,4-dichlorobenzoic acid and 4,5-dichlorophthalic acid evaluation of their use in formation of thianthrene-containing polyimides, aramids, and polybenzoxazoles and... 

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