Halil Zeki Gök

Enantioselective Ethylation of Various Aldehydes Catalyzed by Readily Accessible Chiral Diols.

Four chiral C2 -symmetric diols were synthesized in a straightforward three-step reaction and demonstrated excellent enantioselectivities and good overall yields. Their catalytic activities were examined via the addition of diethylzinc to various aldehydes. The enantioselective addition of diethylzinc to 2-methoxybenzaldehyde gave the corresponding chiral secondary alcohol with high yields (up to 95%) and moderate to good enantiomeric excess (up to 88%). All synthesized ligands were evaluated in the addition of diethylzinc to various aldehydes in the presence of an additional metal such as Ti(IV) complexes. Chirality 28:593-598, 2016.

Complexation and Adsorption Studies of 27-Membered Dioxadiazapentathia Macrocycles with Some Transition Metals

The metal ion-binding properties of two 27-membered macrocycles with N2S5O2 donor atoms 1 and 2 were investigated using solvent extraction experiments. In order to explain complexation behavior of macrocycles, extraction of ions in the interfacial region of liquid-liquid phase was modeled by Langmuir adsorption isotherm. The macrocycles 1 and 2 extracted Ag+ metal ion up to 95% to the dichloromethane and chloroform phase effectively. The Ag+ ion adsorption capacities of macrocycles 1 and 2 were obtained as 75% and 98% at 20°C, respectively.