Polymerization of β-phenyl glutaconic diethyl ester (GE) with various diamines (DA) at 1:2 molar ratios in 1,4dioxane solvent was carried out at reflux temperature. The resultant amino terminated unsaturated oligomers (ATUP) were characterized by elemental analysis, number of terminal amino groups, IR spectral studies, number average molecular weight estimated by non-aqueous conductometric titr...

A polyester composite was prepared through the polymerization of an unsaturated ester resin with styrene and an open-cage oligomeric silsesquioxane with methacrylate groups. The effect of the open-cage oligomeric silsesquioxane on the thermal stability of the thermostable polyester was studied using both thermogravimetric analysis and differential thermal analysis. The results showed that the m...

The rhodium-catalyzed, directed catalytic asymmetric hydroboration of g,d-unsaturated amides affords a direct route to chiral acyclic secondary g-borylated carbonyl derivatives in high enantiomeric purity. In contrast to a similar b-borylated amide derivative, the g-borylated amide undergoes Suzuki–Miyaura cross-coupling with stereoretention. The utility of the boronic ester products is further...

The planar structure of aculeximycin (1) produced by Streptosporangium albidum has been determined by spectral methods and chemical degradations such as 1,8-diazabicyclo[5,4,0]undec-7-ene (DBU)-methanol reaction, ozonolysis, and periodative oxidation. The antibiotic consists of a 30-membered polyhydroxy lactone ring, an alpha, beta-unsaturated ester group, an intramolecular hemiketal, an oligos...

The fatty acid specificity of the bile salt-activated lipase purified from human milk was studied using C12 to C54 (total acyl carbon) saturated and the C54 unsaturated triacylglycerols. Kinetic studies indicated that the short chain triacylglycerols were hydrolyzed more readily than the long chain triacylglycerols, and that the long chain unsaturated triacylglycerols were attacked more readily...

In the present paper, many unsaturated polyesters has been synthesized using maleic anhydride, phthalic anhydride and succinic for esterification with new monomer [E)-1-(4-hydroxyphenyl)-3-(3-methoxy-4-hydroxyphenyl) prop-2-en-1-one]. These were polymerized by condensation reaction . Their chemical structures characterized FTIR, 13C-NMR 1H NMR spectroscopy. Thermal properties have analysed Diff...

The limited solubility of cholesteryl esters in polar lipids is important as it determines their access to polar surfaces of lipoproteins, their interaction with plasma membranes and their phase formation with phospholipids. Variations in cholesteryl ester concentrations in membranes may be related to the physiological role of the membranes. In lysosoma1 membranes cholesteryl ester concentratio...

Recent work (1) has established that plaamalogenic phosphatides resemble the conventional glycerophosphatides such as phosphatidylcholme (I) very closely in structure, except that one fatty acid ester linkage is replaced in the plasmalogens by an aldehydogenic bond, presumably that of an a,fi-unsaturated ether. The exact position of the aldehydogenic bond is not yet certain. It had been conclud...