CH 6610 / 6604 – CHEMISTRY OF NATURAL PRODUCTS

Date & Time: 23/04/2009 / 9:00 – 12:00 Dept. No. Max. : 100 Marks

PART – A

Answer ALL the questions: (10 x 2 = 20)

What is Zeisels method?
Predict the product of complete Hoffmann’s exhaustive methylation of piperidine.
What are flavones?
Explain the geometrical isomerism exhibited by citral.
Write down the Robinsons Synthesis of anthocyandin.
Predict the product of KoH fusion of cyandine chloride.
What happends when uric acid treated with Conc. HNO₃.
How will you convert uric acid to Theophylline.
Write the structure of alizarin.
What will be the product selenium distillation of cholestrol.

PART – B

Answer any EIGHT questions: (8 x 5 = 40)

How will you synthesis piperine.
What are anthocyanisis? Give exmaples.
What are the various conformation exhibited by Menthol.
Predict the Ozonolysis product of b–ionone.
What happens when Geranic acid is treated with cold alkaline potassium permanganate solution.
How flavones are prepared by Baker-Venkatraman Synthesis.
Write down the Traubes Synthesis of Caffeine.
Write down the synthesis of Camphornic acid.
Explain the nature and position of side chain in cholestrol.
Write the synthesis of Alizarin.
Briefly elucidate the structure of Indigoitin.
What are purines? What are all its biological importance.

PART – C

Answer any FOUR questions: (4 x 10 = 40)

Elucidate the structure of papaverine.
Explain the general methods of structural clucidation of alkaloids with suitable examples.
Explain any two of the following:
Cartenoids
Biological properties of papaverine
Spectral properties of steroids
Isoprene rule.
Write down the synthesis of Oestrone.
Write the synthesis of any two (i) Conine (ii) Nicotine (iii) Indigotin
Write the importance and structural determination Quercetin.

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