نتایج جستجو برای: polyphosphoric acid
تعداد نتایج: 747445 فیلتر نتایج به سال:
A new, robust and simple method is proposed for the chemiluminescent determination of the pesticide Bromoxynil. The empirical procedure is performed with the aid of a flow-injection manifold provided with an on-line photo-reactor to obtain chemiluminescent photofragments. After a period of 12 s of irradiation with an 8 W low-pressure mercury lamp, a chemiluminescent oxidation was performed with...
Background The modification of asphalt binder to improve performance properties has grown significantly since the implementation of the Strategic Highway Research Program (SHRP) binder specifications. There has been increased use of polymers, crumb rubber modifier and Polyphosphoric Acid (PPA). There has been concern by many highway agencies about the performance characteristics of PPA modifica...
The synthesis of the spiro(4,5)decane system is of interest because it constitutes the basic skeleton of the acoranic sesquiterpenes [1]. In this paper we wish to report a stereospecific synthesis of a promising precursor (1) of some of these natural products. According to literature [2] cyclohexanones asubstituted with a co-carboxyalkyl chain yield diketo-spiro systems on treatment with polyph...
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