Terephth aldehyde

Both carbonyl groups of terephthaldehyde are reported to react with the exocyclic nitrogen of 2-aminothiazole yielding 1.4-phenylene bis(2-methyleneamino)thiazole. The same report describes the reactions of 2-amino-4-phenylthiazole with terephth aldehyde and salicylaldehyde as yielding 64 and 65, respectively (Scheme 45) (215), whose structures are based on ultraviolet and infrared spectra. 

Benzene Toluene Benzal- dehyde Tolual- dehyde Terephthal- aldehyde Total... 

Benzoic acid, 4-formyl-, methyl ester p-Carbomethoxybenzaldehyde CCRIS 6063 EINECS 216-385-5 p-Formylbenzoic acid methyl ester HSDB 5842 Methyl 4-formylbenzoate Methyl p-formylbenzoate Methyl benzaldehyde-4-carboxylate Methyl terephth-aldehydate NSC 28459 Terephthalaidehydic acid, methylester. 

Modified benzoin condensation. Benzoin-type condensation of terephthal-aldehyde (1) apparently involves only one of the two aldehyde groups. However,... 

Assigned by analogy with the terephthal-aldehyde radical anion. 

Compounds 5 were generally recrystallized from absolute ethanol. For different symmetrical phasmids and biforked mesogens, the synthetic route is similar with protected and deprotected phenols or anilines. The central ring moiety is often terephthal-ic acid, 1,4-cyclohexanedicarboxylic acid, or terephthaldehyde. With non-symmetric polycatenar mesogens, the different intermediate compounds are protected or deprotected phenols, anilines and acids or aldehydes. The same method is repeated to add a benzoate. The last step is often an esterification reaction (Scheme 2) unlike the imine derivatives, compounds with ester linkages can be easily purified by chromatography on silica gel with dichloromethane as eluent. 

Other methods for modifying polymers with carbohydrates via the postpolymerization technique include the photo-grafting of poly(ethylene terephthal-ate) (PET) fibers with glycosyl azides [218] and the use of carbohydrates bearing isocyanate [219] or aldehyde [220] groups, which react efficiently with polymers bearing pendant amino residues. 

---