نتایج جستجو برای: polyphosphoric acid
تعداد نتایج: 747445 فیلتر نتایج به سال:
An efficient access to the tetracyclic-fused quinoline systems, 12-phenylbenzo[6,7]oxepino[3,4-b]quinolin-13(6H)-one derivatives 4a-l, is described, involving the intramolecular Friedel-Crafts acylation reaction of 2-(phenoxymethyl)-4-phenylquinoline-3-carboxylic acid derivatives 3a-l aided by the treatment with PPA (polyphosphoric acid) or Eaton's reagent. The required starting compound (2) wa...
Polybenzimidazole (PBI)-based high-temperature proton exchange membranes (PEMs) offer many advantages that aid in a simplified fuel cell system design. Such benefits include high resistance to fuel impurities (most notably carbon monoxide), fast electrode kinetics, and simplified water and thermal management due to operational temperatures above 120 ◦C.[1] As a result of its intrinsic physicoch...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید