Chemoselectivity and Regioselectivity in Reactions of Pyrimidines.

Chemoselectivity in Transfer-Hydrogenation Reactions

CHEMOSELECTIVITY AND REGIOSELECTIVITY IN HYDROFORMYLATION The control of chemoselectivity is a fundamental concern in Rh-catalyzed hydroformylation

1 RHODIUM-CATALYZED STEREOSELECTIVE HYDROFORMYLATION Reported by Daniel Robbins October 16, 2008 INTRODUCTION Hydroformylation, the conversion of olefins into aldehydes through the addition of CO and H2, is an important industrial reaction that employs homogeneous catalysis by transition metals (Figure 1). Hydroformylation is a valuable reaction in organic chemistry because it produces aldehyde...

Determinants of regioselectivity and chemoselectivity in fosfomycin resistance protein FosA from QM/MM calculations.

FosA is a manganese-dependent enzyme that utilizes a Mn(2+) ion to catalyze the inactivation of the fosfomycin antibiotic by glutathione (GSH) addition. We report a theoretical study on the catalytic mechanism and the factors governing the regioselectivity and chemoselectivity of FosA. Density functional theory (DFT) calculations on the uncatalyzed reaction give high barriers and almost no regi...

synthesis of sulfides from alcohols and thiols in solvent-freeconditions and deoxygenation of sulfoxides

کاتالیست یک سنتز جدید برای تیواترها توصیف شده است. واکنش الکل ها با آریل، هتروآریل و آلکیل تیو ل ها درحضور 1،3،5- تری آزو- 2،4،6- تری فسفرین-2،2،4،4،6،6 هگزاکلراید ((tapc به عنوان یک کاتالیست موُثر، بازده های خوب تا عالی از تیواترها را حاصل می کند. علاوه براین، واکنش تحت شرایط بدون فلز و بدون حلال پیش می رود، بنابراین یک مکمل جالب برای روش های شناخته شده سنتز تیواترها ارائه می دهد. یک مکانیسم ا...

role of cultural iran in promotion of multilaieralism in central asia and caucasus

cultural iran is a scope that is more extended than the political territories of iran as a political unit. this concept means that cultural geography(mehdi moghanlo-1383-1) of iran is greater than its political geography which, according to history, has a long history extending west-east from kandahar to the euphrates and north-south from the persian gulf to the caucasus including transoxiana a...