02038nas a2200229   4500008004100000022001400041245012400055210006900179260010300248300001200351490000700363520112000370653002801490653002101518653002001539653002401559653002301583100002901606700002301635700001901658856013101677       2014                        eng d  a0376-469900aSynthesis and characterization of triad based rigid mesogenic diols derived from hydroquinone and 4-hydroxybenzoic acid0 aSynthesis and characterization of triad based rigid mesogenic di  aANUSANDHAN BHAWAN, 2 RAFI MARG, NEW DELHI, 110001, INDIAbCOUNCIL SCIENTIFIC & INDUSTRIAL REScMAY  a591-5960 v533 a<p>Triad based rigid mesogenic diols have been synthesized by four step synthesis method using protection-deprotection method. Hydroquinone and 4-hydroxy benzoic acid have been used as starting materials. Synthesized diols have been characterized by IR, H-1 and C-13 NMR, and mass spectroscopic methods. Thermal properties have been determined by thermo gravimetric analysis method and degree of crystallinity have been measured by wide angle X-ray technique. Substituted hydroquinones (methyl and chloro) have been used to study the effect of substitution on physical and thermal properties. Synthesis of rigid mesogenic diol monomer using p-hydroxy benzoic acid and hydroquinone is reported, which is a facile route. Hydrolysis of diacetate derivatives of rigid mesogenic diols is performed in good yields, even though two types of ester groups present in the same moiety, aromatic and aliphatic. The experimental results reveal that hydroquinone based rigid triad mesogenic diol have high thermal stability and degree of crystallinity as compared to methyl-and chloro-substituted rigid triad mesogenic diols.</p>10adegree of crystallinity10aester hydrolysis10aMesogenic diols10aspectral properties10aThermal properties1 aMulani, Khudbudin, Baban1 aGanjave, Nitin, V.1 aChavan, Nayaku  uhttps://library.ncl.res.in/content/synthesis-and-characterization-triad-based-rigid-mesogenic-diols-derived-hydroquinone-and-0