ALKADIENES

1. ORGANIC CHEMISTRY 2 ALKADIENES (diolefines, dienes)

2. ALKADIENES Acyclic acid or unbranched hydrocarbons having two carbon-carbon double bonds. Many compounds contain two or more double bonds and are known as alkadienes, alkatrienes, alkatetraenes, and so on, the suffix denoting the number of double bonds.

3. ALKADIENES General Formula: CnH2n-2

4. ALKADIENES   Alkadienes are classified into three categories on the basis of location of two double bonds.

5. CUMULATIVE DOUBLE BONDS A further classification is used for the relationships of the double bonds to each other. Thus 1,2-alkadienes and similar substances are said to have cumulated double bonds:

6. CUMULATIVE DOUBLE BONDS

7. CONJUGATED DOUBLE BONDS 1,3-Alkadienes and other compounds with alternating double and single bonds are said to have conjugated double bonds:

8. CONJUGATED DOUBLE BONDS 1,3-pentadiene

9. ISOLATED DOUBLE BONDS  Molecules having two double bonds separated by more than one single bond. Compounds with double bonds that are neither cumulated nor conjugated are classified as having isolated double-bond systems:

10. ISOLATED DOUBLE BONDS 1,4-pentadiene

11. Sources Botryococcus braunii

12. PROPERTIES Cumulated dienes- are reactive compounds and their are in the first place theoretical importance. 

13. PROPERTIES Conjugated dienes- Physical properties of the conjugated dienes are similar than simple alkenes. Produce from diol for example.  Chemical properties of the conjugated dienes are similar than simple alkenes too. So the first reaction the addition.

14. PROPERTIES Isolated dienes-  Similar properties to monoolefins.

15. APPLICATIONS OF ALKADIENES

16. Used in the production of tires APPLICATIONS OF ALKADIENES

17. Used in the production of plastics APPLICATIONS OF ALKADIENES

18. SAFETY AND HAZARDS

19. SAFETY AND HAZARDS Possible hazard : May cause cancer. Rubber compounds generally do not pose a health hazard unless heated. Under normal conditions of processing and use, exposure to the chemical constituents in this product is unlikely. Skin (dermal) contact is possible.

20. SAFETY AND HAZARDS POTENTIAL HEALTH EFFECTS HAZARDS Inhalation: Dust may irritate throat and respiratory system and cause coughing. Lower concentrations of fumes from burning this material may cause respiratory irritation with coughing, difficulty in breathing, or shortness of breath. High concentrations may cause severe irritation, pulmonary edema (body fluid in the lungs) with coughing, wheezing, and abnormal lung sounds. Symptoms may progress to severe shortness of breath, central nervous system effects, and collapse. Symptoms may be delayed and progressively worsen.

21. SAFETY Inhalation : If fumes from heated product are inhaled: Move into fresh air and keep at rest. Move the exposed person to fresh air at once. For breathing difficulties oxygen may be necessary. If breathing stops, provide artificial respiration. Consult a physician for specific advice. SAFETY AND HAZARDS POTENTIAL HEALTH EFFECTS

22. SAFETY AND HAZARDS HAZARDS Eye Contact: . Decomposition products may cause eye irritation. Contact with hot material can cause thermal burns which may result in permanent damage. SAFETY Eye Contact: Dust in the eyes: Flush eyes thoroughly with water, taking care to rinse under eyelids. If irritation persists, continue flushing for 15 minutes, rinsing from time to time under eyelids. If discomfort continues, consult a physician.

23. HAZARDS Skin Contact: Prolonged or repeated skin contact may cause irritation. Individuals sensitive to small amounts of curing agents present may develop a rash (dermatitis). Contact with hot material can cause thermal burns which may result in permanent damage. SAFETY AND HAZARDS SAFETY Skin Contact: Remove contaminated clothing immediately and wash skin with soap and water. If irritation occurs, get medical assistance.