An Application of Differential Subordination

We apply the general theory of differential subordination to obtain certian interesting criteria for -valent starlikeness and strong starlikeness. Some applications of these results are also discussed

Differential Sandwich Theorems for Some Subclass of Analytic Functions Associated with Linear Operators

" PDF file" DOI : http://dx.doi.org/10.22342/jims.13.1.73.39-5

Applications of Differential Subordination and Superordination

In the present investigation we obtain asndwich theorems for certain subclass of analytic functions defined by convolution. Our results generalizes several well known results.DOI : http://dx.doi.org/10.22342/jims.14.1.62.47-5

1-Formyl-t-3,t-5-dimethyl-r-2,c-6-diphenyl­piperidin-4-one

In the title compound, C20H21NO2, the piperidine ring adopts a distorted boat conformation. The dihedral angle between the two phenyl rings is 61.33 (18)°. In the crystal, inter­molecular C—H⋯O inter­actions link the mol­ecules into zigzag C(5) chains running parallel to [100]

Kinetic and theoretical studies on the reaction of phenacyl bromide with 4DMAP in the presence of certain phenols

414-417The quanternization reaction between phenacyl bromide an 4-(dimethylamino)pyridine (4DMAP) has been studied at 25, 30 and 35°C in acetone, Added phenols with pKa > 7.0 retard the rate of quaternization and there is no ether formation. This has been confirmed through product analysis by HPLC using paired ion chromatography (PIC) reagents –A. The reaction has been followed conductometrically using Gugenheim’s method. Theoretical calculations(PM3) confirm the formation of H-bonded complex between the phenoI(s) and 4DMAP, that could retard the rate of quaternization. Relative proton affinity (PA) values of various phenolates computed here explain the preferential formation of quaternary salt over ether in the reaction