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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:
Nucleus - Nomenclature of simple aromatic compounds The benzene ring denoted by regular hexagon of six carbon atoms along with three double bonds in the alternate positions is
Calculate the free energy change of following reaction at298 kelvin H2+I2=2HI if the enthalpy change is 51.8816kj and the entropy change is 166.15j is this reaction thermodyanamica
Li + H20 ----> LiOH + H2....if I start with 3.4 mols of H2O , how many mols of H2 can I make?
What is the name of this reaction cycle? Which oxidation product is released from the cycle? What are the decreased products? The reduced products A and B are reoxidiz
Which of the following compounds is ionic: (1) Kl (2) CH 4 (3) Diamond (4) H 2 Ans: Kl
SULFUR, SELENIUM AND TELLURIUM The elements known commonly as the chalcogens are in the same group (16) as oxygen. They form some compounds same to those of oxygen, but show m
Q. How to Replace Metals from their Salts: Ans. If zinc is added to a solution of copper (II) sulfate, it dissolves. A reddish-brown deposit of metallic copper appears,
Q. Estimation of synthetic food colours in foods? Food colours in various products need to be isolated, identified and then quantitatively measured for their limits. Estimatio
Electron transfer is the easiest type of redox process, an example being A majority of reactions of that type are very fast, but oxidation by some complexes (especially of
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