Bisphenol A, diacetate

Terephthalic Acid—Isophthalic Acid—Bisphenol-A Diacetate Melt Polyesterification... 

Polyesters extended with dianhydride Via (from bisphenol A diacetate and trimellitic anhydride) instead of PMDA gave results similar to those shown in Table II. Polyesters extended with dianhydrides VIb or Vic gave inferior results. 

Also obtained by Fries rearrangement of bisphenol A diacetate in nitrobenzene,... 

Also obtained by Fries rearrangement of 2,2-bis(4-acetoxyphenyl)propane (bisphenol A diacetate) with alnmininm chloride in an acetyl chloride/ethylene dichloride mixture at 50° for 30 h (10%) [5905],... 

Benzylresorcinol. 4-Benzyl-l,3-benzenediol, 1002 Bisphenol A diacetate. 2,2-Bis(4-acetoxyphenyl)propane, 1032 Bisphenol S diacetate. 4,4 -Diacetoxydiphenyl sulfone, 974, 1016 Brevifolin. 2 -Hydroxy-4, 6 -dimethoxyacetophenone, 837 2-Bromohydroquinone diacetate. 2-Bromo-l,4-benzenediol diacetate, 683... 

Fusion with alkali and sodium acetate also served to cleave bisphenol A polycarbonate - dimethylsiloxane block copolymer. Bisphenol A diacetate produced was identified by gas chromatography as a polycarbonate fragment and gas-solid chromatography was used to identify methane produced by cleavage of substituted siloxone. 

Boxing dental wax, 8 299 specification, 8 300t Box-type mixer-settler, 10 774 Boyer, Herbert, 11 11 BPA diacetate, transesterification of, 19 816. See also Bisphenol A (BPA)... 

There is an alternative method of making functional derivatives for polymerization. Durene can be condensed with formaldehyde in the presence of hydrochloric acid and zinc chloride to give the bis-chloromethyl durene(75). This can be converted into a number of derivatives from which polymers can be made, e.g. durene-1,4-dicarboxylic acid for polyamides(76), the diacetic acid for polyesters(77,78) or for polyamides(79), the diisocyanatomethyl derivative for polyureas and polyurethanes(80,81), the dimethanol derivative for polyurethanes(82) and for epoxies(83), while the bis chloromethyl derivative has also been proposed for making polyethers (with bisphenol A)(84). In each case, the attraction from the durene derivative has been the introduction of higher melting points and inproved softening properties. None of these polymers have been commercialized, possibly in part because of the difficulty of obtaining durene at suitable-prices. 

Bisa.codyl, 4,4 -(2-PyridyLmethylene)bisphenol diacetate [603-50-9] (Dulcolax) (9) is a white to off-white crystalline powder ia which particles of 50 p.m dia predominate. It is very soluble ia water, freely soluble ia chloroform and alcohol, soluble ia methanol and ben2ene, and slightly soluble ia diethyl ether. Bisacodyl may be prepared from 2-pyridine-carboxaldehyde by condensation with phenol and the aid of a dehydrant such as sulfuric acid. The resulting 4,4 -(pyridyLmethylene)diphenol is esterified by treatment with acetic anhydride and anhydrous sodium acetate. Crystallisation is from ethanol. 

The effect of bisphenol structure on kinetic parameters of their high temperature reaction with terephthaloyl chloride has been evaluated and discussed. " In this field a new preparative process involving the interaction of a pre-formed polyester, a diacid, and bisphenol diacetates in the melt-phase has been described. Kinetic and mechanistic studies have indicated the reaction to occur via the simultaneous cleavage of the pre-formed polyester by the diacid, condensation polymerization of carboxy and bisphenol acetate groups, and equilibration through polyester cleavage by carboxyl polymer ends. 

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