1,6-hexanediol, polycondensation with

PPF catalyzed an enantioselective polymerization of bis(2,2,2-trichloroethyl) tra 5-3,4-epoxyadipate with 1,4-butanediol in diethyl ether to give a highly optically active polyester (Scheme 9). °° The molar ratio of the diester to the diol was adjusted to 2 1 to produce the (-) polymer with enantiomeric purity of >96%. The polymerization of racemic bis(2-chloroethyl) 2,5-dibromoadipate with excess of 1,6-hexanediol using lipase A catalyst produced optically active trimer and pentamer. The polycondensation of 1,4-cyclohexanedimethanol with fumarate esters using PPL catalyst afforded moderate diastereoselectivity for the cis/trans monocondensate and markedly increased diastereoselectivity for the dicondensate product. 

Multicyclic polyesters by polycondensation of 5,5, 6,6 -telr hy ro-xY-XXy -tetramethylspiro-bisindane with sebacoyl chloride or 1,6-hexanediol bischlo-roformiate were synthesized, as depicted in Fig. 45, and the formed polymer has an amorphous character [150]. 

Another demonstration of the independence of the reactivity of functional groups with chain length was given by determining the degree of polycondensation for polymers derived from a homologous series of acids, each acid reacting with 1,6-hexanediol under identical conditions [32]... 

Aliphatic polycarbonates (polyesters of carbonic acid) are obtained by the transesterification reaction of dialkyl carbonates (for example dimethyl carbonate) with aliphatic diols. A typical example is the polycondensation of dimethyl carbonate with 1,6 hexanediol (reaction 8.3) [4-8] ... 

When an oil-soluble monomer and a water-soluble monomer reside in their respective oil and aqueous phase, respectively, they react at the miniemulsion droplet surface, thereby forming the nanocapsules. Torini et al. have shown that interfacial polycondensation of isophorone diisocyanate (IPDI) and 1,6-hexanediol in cyclohexane-water mini ulsions stabilized with SDS resulted in stable polyurethane nanocapsules with a diameter of around 200 nm and narrow size distribution. A critical SDS concentration higher than 1 wt%, relative to the organic dispersed phase, is required to ensure the stability of the miniemulsion and nanocapsules. Hexadecane was used as costabilizer, and the surfactant-to-costabilizer ratio, varied between 1 1 and 1 3, has no influence on the size and size distribution of the miniemulsion and nanocapsules. The nanocapsules obtained in such conditions are stable over 18 months, without any increase in the z-average diameter and the zcto-potential. 

Quintana et al. (59) have prepared a series of terpolyesters derived from PECT, where the EG units were partially replaced by lineal aliphatic diols as 1,3-propanediol, 1,4-butanediol or 1,6-hexanediol) (Figure 6.15). These terpolyesters were obtained with a random microstructure and in high yields by two-step melt polycondensation from terephthalic acid, 1,4-CHDM and mixtures of EG and the second alkanediol. The incorporation of the alkanediol into the copolyester was not complete, especially in the case of BD, which is partially converted into tetrahydrofurane during polycondensation. When these terpolyesters were synthesized using DTM instead of PTA, they reached higher molecular weights and their compositions were more in accordance with those used in the feeds. 

TTSBI which is soluble in various polar solvents was used as nucleophilic monomer for several syntheses of multicyclic polyesters [21] and polyethers [22]. With sebacoyl chloride or 1,6-hexanediol bischloroformiate (see Formula 12.7) gelation occurred even the ICM was lowered to 0.02 mol/L. At this ICM asoluble multicycles were obtained, when the ahphatic-aromatic DADs outlined in Formula 12.7 were used as reaction partners and with the m-isomers an ICM of 0.04 was sufihcient. Soluble, multicyclic polyethers were isolated from polycondensations of TTSBI and tosylated di- and tri(ethylene glycol) at an ICM of 0.02 mol/L [19]. These materials possess the expected properties of multicyclic crown ethers (or cryptants) and form complexes with aU alkali metal ions. Attempts to prepare multicyclic aromatic polyethers were less successful [23]. Despite optimization of the reaction conditions nearly quantitative conversions were never achieved regardless, if 4,4-dichlor- or 4,4-diffluorodiphenyl sulfone... 

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