Synthesis of Poly(thioether thioether ketone) (PTTK) Starting from Hydroquinone

Synthesis of All Aromatic Poly(Thioether-Ketone)s, Sulfur-Containing High Performance Polymers with High Solubility

Novel aromatic poly(thioether-ketone)s (PTEKs) bearing the 2,6-dimethyl-1,5-naphthylene unit were synthesized by the polycondensation of aromatic dihaloketones and aromatic dithiols in the presence of K2CO3. High molecular weight ( Mn∼ 65 000, Mw∼ 350 000) PTEKs were obtained in quantitative yields. The molecular weight and yield of PTEK obtained from dichloroketone and dithiol were much higher than those of the corresponding poly(ether-ketone) obtained from dichloroketone and biphenol. The use of the fluoroketone as a monomer did not increase the Mn of PTEK. The effect of reaction conditions on the yield and the molecular weight of PTEKs was investigated. The phase-transfer-catalysed polycondensation and the polycondensation using masked dithiol and dichloroketone were also investigated. The PTEKs prepared have high solubility in ordinary organic solvents. Flexible, transparent, and strong cast films were prepared. The PTEKs had high glass transition temperatures (PTEK-1, 245°C and PTEK-2, 215°C) and 5% weight loss temperatures (PTEK-1, 435°C and PTEK-2, 436°C).

Thione-thiol rearrangement: miyazaki-newman-kwart rearrangement and others

Thione-to-thiol rearrangements represent a general route for the synthesis of sulfur compoundsfrom hydroxyl functionalities. In particular, the Miyazaki-Newman-Kwart rearrangementhas been widely used for the synthesis of aromatic thiols from the corresponding phenols.

Synthesis of functional aromatic multisulfonyl chlorides and their masked precursors

The synthesis of functional aromatic bis(sulfonyl chlorides) containing an acetophenone and two sulfonyl chloride groups, i.e., 3,5-bis[4-(chlorosulfonyl)phenyl]-1-acetophenone (16), 3,5-bis(chlorosulfonyl)-1-acetophenone (17), and 3,5-bis(4-(chlorosulfonyl)phenyloxy)-1-acetophenone (18) via a sequence of reactions, involving in the last step the quantitative oxidative chlorination of S-(aryl)- N,N'-diethylthiocarbamate, alkyl- or benzyl thiophenyl groups as masked nonreactive precursors to sulfonyl chlorides is described. A related sequence of reactions was used for the synthesis of the aromatic trisulfonyl chloride 1,1,1-tris(4-chlorosulfonylphenyl)ethane (24). 4-(Chlorosulfonyl)phenoxyacetic acid, 2,2-bis[[[4-(chlorosulfonyl)phenoxyacetyl]oxy]methyl]-1,3-propanediyl ester (27), 5,11,17,23-tetrakis(chlorosulfonyl)-25,26,27,28-tetrakis(ethoxycarbonylmethoxy)calix[4]arene (38), 5,11,17,23,29,35-hexakis(chlorosulfonyl)-37,38,39,40,41,42-hexakis(ethoxycarbonylmethoxy)calix[6]arene (39), 5,11,17,23,29,35,41,47-octakis(chlorosulfonyl)-49,50,51,52,53,54,55,56-octakis(ethoxycarbonylmethoxy)calix[8]arene (40), 5,11,17,23-tetrakis(tert-butyl)-25,26,27,28-tetrakis(chlorosulfonyl phenoxyacetoxy)calix[4]arene (44), 5,11,17,23,29,35-hexakis(tert-butyl)-37,38,39,40,41,42-hexakis(chlorosulfonylphenoxyacetoxy)calix[6]arene (45), and 5,11,17,23,29,35,41,47-octakis(tert-butyl)-49,40,51,52,53,54,55,56-octakis(chlorosulfonylphenoxyacetoxy)calix[8]arene (46) were synthesized by two different multistep reaction procedures, the last step of both methods consisting of the chlorosulfonation of compounds containing suitable activated aromatic positions. 2,4,6-Tris(chlorosulfonyl)aniline (47) was obtained by the chlorosulfonation of aniline. The conformation of two series of multisulfonyl chlorides i.e., 38, 39, 40 and 44, 45, 46, was investigated by (1)H NMR spectroscopy. The masked nonreactive precursor states of the functional aromatic multisulfonyl chlorides and the aromatic multisulfonyl chlorides reported here represent the main starting building blocks required in a new synthetic strategy elaborated for the preparation of dendritic and other complex organic molecules.