organic compunds: last week: formation of dioxins. When you are generating these defoliants
you end up forming dioxins. When yo are forming T4DD and T5DD you can end up forming
dioxins. Reason for accidents.
2. There are other ways they can be generated:
a. Temporaphenol? – (image one) often put into wood. Kills mold. if you burn wood you
can see the structure and how it might end up with dioxin. This Is why it is not used
b. Paper industry: ligning is highly aromatic and the way wood is bleached is through Cl2
gas, and ends up chlorinating lots of compounds,and this is not used as a bleaching
agent anymore. CL2o is used now.
c. _ end of herbicides and pesticides –
4. PCB – are chemicals that was baned in 1977 in Namerica. Had some degree of chlorination in it.
See the image above. Not acutely toxic. Was good electric insulators, was used in industrially.
Log kow depends on the amount of chlorine in rings: 4.5 8.2. chlorinated biphenyl is 8.2.?
5. More chlorines heavier the compounds, the lighter ones slowly volatizes from the lake. 6. When they are heated in the presence of Q they transform themselves. One f the byproducts
will be the compound in the image. Furans. Example of polychlorinated dibenzofurans. / PCDFs.
7. Many of them are not used anymore.
9. Stockhalm convention addresses POP’s : persistent Organic Pollutants. A whole bunch of
organic products are addressed in this convetion
10. They all have a few common factors:
a. They resist degradation. : largely related fact for chlorine compounds
b. Persist in the envronemnt:
c. Have to bioaccumulate and biomagnify.
d. Inential impacts on human health. Which are largely developmental or neurological.
e. PCB, DDT are pesticides. Stockhalm convention was signed in 2004? 2001.
f. These compounds which fit into this category is:
i. Low water solubility: so they don’t wash away relate to their persistence in the
ii. Semi volatile : if they are too involatile they don’t bioaccumulate. They have to
have some degree of volatility too
iii. Chmorinated: almost entirely chlorinatesd
iv. Little soluilty in water.
v. Montreal protocol removed use of CFC.
vi. The one that is more realistc is the Kyoto convention? 11. Two more classes of compunds:
i. Enterpreunal destructers and estradiol release?
ii. The compound is a good example. Image above.
iii. This mimics some problems: if oyu put up destructer estradiol you can look at
the structure you can think that the
iv. There are reproductive effects relaresd with this compunds, can affect
hormones. Endorphin destructers and estrogens you can have extremely low
levels and still have effects.
v. You can see some of them effects in chlorins compunds as well. Much of the
time is taken to change the environmental impact of these compunds.
vi. For EDT you can do the same thing. The active site is the tetrahedral C in the