the facile and high yield synthesis of a new series of dibenzophenones in the presence of polyphosphoric acid (ppa) together with their cyclization to corresponding moni and dixanthones are described. the aromatic nucleophilic substitution of these new compounds are also studied.

Interspecific germplasm introgression enables unique opportunities for genetic analysis and improvement of domesticated plants, but is commonly impeded by barriers to transmission and recombination, insufficient genetic resolution, and the difficulty of deriving economically suitable products. Such impediments are mitigated to varying extents by the breeding of chromosome substitution lines; ho...

Carbon dioxide enrichment changes the balance of photosynthetic limitations due to water, nitrogen, and light. This paper examines the role of stomata in these changes by comparing enrichment responses predicted by an optimality-based tree growth model, DESPOT, using three alternative 'setpoints' for stomatal acclimation: leaf water potential (psi(l)-setpoint), the ratio of intercellular to amb...

nitrate is an anion of major importance particularly in biological areas. excessive amounts in water supplies indicate pollution from sewage or agricultural effluents. the effects of excessive quantities of nitrate in water are well known. in this research structural modification of natural clinoptilolite by isomorphic substitution was performed. isomorphously substituted zeolite was prepared u...

In this study, aggregates in asphalt concrete were partially replaced by basic oxygen furnace slag (BOFS) proportions of 45 wt.%, 55 and 75 wt.%. The thermal performances the specimens are discussed based on conductivity, emissivity, indoor outdoor temperature measurements. Consequently, wt.% specimen’s BOFS, which had a high emissivity 0.86 across sky window. tests, change was recorded to esti...

This paper investigates an isolated setting of the lexical substitution task of replacing words with their synonyms. In particular, we examine this problem in the setting of subtitle generation and evaluate state of the art scoring methods that predict the validity of a given substitution. The paper evaluates two context independent models and two contextual models. The major findings suggest t...