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This cycloaddition reaction involves sixteen electrons; hence, it must be suprafacial on one component and antarafacial on the other. Thus, it must be a [14s + 2a] or a [14a + 2s] cycloaddition. The heptafulvene molecule is large enough that its p-electron system can twist without introducing too much strain or without losing too much p-electron overlap; hence, the cycloaddition is a [14a + 2s] process. In either case, the product has the following stereochemistry:
Explain the Components approach to the phase rule? The derivation of the phase rule in this section uses the concept of components. The number of components, C, is the minimum
Low grade oxide, sulphide and carbonate ores of copper are treated with dilute sulphuric acid in the existence of oxygen: CuO+ H 2 SO 4 ------------------> CuSO 4 + H 2 O CuC
Antioxidants: Antioxidants are the significant and essential food additives. These substances hold back the action of oxygen on the food and hence help in its preservation. Th
The concentration of hydrogen ions in solution affects the enzyme activity. Every enzyme has maximal efficiency under an optimum pH. As pH is one of the factors for the denatura
the value of charge on the oil droplets experimentally observed were -1.6*10-19 and -4*10-19coulomb. the value of the electronic charge,indicated by these results is
construction and working of secondary cell
why we consider carbon as standared for atomic mass unit
Q. Explain Preservation by Preservatives? Preservatives, as you may already know, belong to a class of food additives that extend shelf life by inhibiting microbial growth, o
This compound, 1,3,5-cyclohexanetrione, exists as its "triene-triol" isomer phloroglucinol because the latter is aroma
Explain with appropriate diagrams the lever rule and Tie-line rule. Compositions of two coexisting phases of a binary system are given by tie-line rule. For overall composition
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