. Discuss umpolung formation with dithiane. Give the reaction of 1,3-dithiane anion with ethanal and cyclohexanone.
Umpolung refers to the reversal of the normal polarity of a functional group in organic chemistry, allowing reactions that are otherwise difficult or impossible. In carbonyl chemistry, the carbon atom of a carbonyl group is normally electrophilic. Umpolung enables this ___ ________ _____ _____ ______ ________ _______ ______.
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) Give the products formed when
give a general reaction of asymmetric 1, 2-aminohydroxylation of alkenes using (DHQ)2-PHAL AD catalyst in the presence of (TsNCINa). Also give various nitrene equivalents which are frequently as reagents in this reaction.
Explain using suitable diagram the mechanism of catalytic hydrogenation of an alkene.
How many signals will appear in the 1H-NMR of the following compounds?
Give the oxiranes formed by the epoxidation reactions of cis- and trans-2-butenes. Also write the mechanism of this reaction.
Nitration of benzothiophene
Discuss any two methods of preparation of oxetanes giving suitable examples.