LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.Sc. DEGREE EXAMINATION – CHEMISTRY
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SIXTH SEMESTER – April 2009
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.