Alkadienes are hydrocarbons that contain two carbon-carbon double bonds. They can be classified based on the location and relationship of the double bonds as cumulated, conjugated, or isolated. Cumulated dienes are reactive, while conjugated dienes have similar physical and chemical properties to alkenes. Isolated dienes behave similarly to monoolefins. Alkadienes are used in the production of tires and plastics. Exposure safety hazards include possible cancer risks from inhalation or skin contact. Symptoms from inhalation include respiratory irritation and effects on the central nervous system. Skin or eye contact may cause burns or irritation.

1. ALKADIENES
(diolefines, dienes)

2.  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.  General
Formula: CnH2n-2

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

5. 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:

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

8. 1,3-pentadiene

9. 
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. 1,4-pentadiene

11. Botryococcus
braunii

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

13. 
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. 
Isolated dienes- Similar
properties to monoolefins.

16. APPLICATIONS OF
ALKADIENES

17. APPLICATIONS OF ALKADIENES

Used in the production of tires

18. APPLICATIONS OF ALKADIENES

Used in the production of
plastics

19. SAFETY AND HAZARDS

20. 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.

21. 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.

22. SAFETY AND HAZARDS
POTENTIAL HEALTH EFFECTS
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.

23. 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.

24. SAFETY AND HAZARDS
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
Skin Contact: Remove contaminated clothing immediately
and wash skin with soap and water. If
irritation occurs, get medical assistance.