A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 7492-70-8, Name is Butyl Butyryllactate, molecular formula is C11H20O4. In an article, author is Ahmed, Nagwa H. S.,once mentioned of 7492-70-8, Recommanded Product: Butyl Butyryllactate.
Effect of replacing the terminal phenyl ring with 3-pyridyl and inversion of imine linkage on the mesophase behaviour of four-ring azo/ester/Schiff base compounds.
In the present work two homologue series of four-ring azo/ester/imine compounds; namely, 4-(4 ‘-alkoxy-phenylazo) phenyl-4 ”-(benzylidene-amino) benzoate, I n, and 4-(4 ‘-alkoxy-phenylazo) phenyl-4 ”-[(pyridin-3-ylmethylene)-amino] benzoate, II n, were prepared and investigated for their mesophase behaviour. In these two types of homologue series, the length of the terminal alkoxy group (n) varies between 6 and 16 carbons. Compounds prepared in both series were structurally characterised via thermogravimetric and elemental analyses, FTIR, H-1-NMR, and mass spectroscopy. Their mesophase transition temperatures were determined by differential scanning calorimetry (DSC), whereas, the type of the mesophase was identified by polarised light microscopy (PLM). The molecular structure-property relationship was conducted aiming to investigate the effect of replacing the terminal phenyl group in I n with a pyridyl one in II n, in addition to the effect of variation of the alkoxy chain length. Aiming to investigate the effect of inversion of the methineazo group on the mesophase behaviour of the compounds, a comparison was made between the prepared series of compounds (I n) with previously prepared four rings 4-(4 ‘-alkoxyphenylazo)-phenyl 4 ”-phenyliminomethyl-benzoate phenyl-4MODIFIER LETTER PRIME-(4 ”-alkoxyphenylazo) benzoate, III n. Finally, the mesophases of series II n were compared with their corresponding three-ring analogues, 4-(4 ‘-alkoxy phenyl -4 ”-[(pyridin-4-ylmethylene)-amino] benzoate analogues (IV n).
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