Thiols & sulfides

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Thiols & sulfides

  1. 1. Thiols & Sulfides Melanie Otte & Julie Fuhrman
  2. 2. Thiols <ul><li>Thiols are sulfur analogs of alcohols </li></ul><ul><li>Also called mercaptans (mercury capturing) </li></ul>
  3. 3. Sulfides <ul><li>Sulfur analogs are called sulfides or thioethers </li></ul><ul><li>Most sulfides react readily to form sulfonium salts </li></ul>
  4. 4. Physical Properties of Thiols & Sulfides <ul><li>Thiols with a low-molecular weight have an appalling odor. The skunk scent is caused by the simple thiols 3-methyl-1 butanethiol and butane-1-thiol </li></ul><ul><li>Thiols have lower boiling points and are less soluble in water than other alcohols </li></ul>
  5. 5. Physical Properties of Thiols & Sulfides <ul><li>The difference in electronegativity between S (2.5) and H (2.1) is 0.4. </li></ul><ul><li>This creates a bond with low polarity </li></ul><ul><li>Show little association by hydrogen bonding </li></ul>
  6. 6. Chemical Properties <ul><li>Sulfides are easily oxidized </li></ul>
  7. 7. Common Compounds <ul><li>Sulfides: argentite (silver sulfide), cinnabar ( mercury, galena lead sulfide), molybdenite ( molybdenum sulfide </li></ul><ul><li>They have a single Sulfur element bonded to a Carbon. </li></ul><ul><li>CH 3 OH = Methanol </li></ul><ul><li>C 4 H 9 SH = Butanethiol </li></ul><ul><li>CH 3 SCH 3 = Dimethyl sulfide </li></ul><ul><li>C 2 H 2 SSC 2 H 5 = diethyl disulfide </li></ul>
  8. 8. Uses & Occurrence <ul><li>Thiols are added to natural gas to serve as an easily detectable warning in case of leaks </li></ul><ul><li>The most common reaction in biological systems is between thiols and disulfides </li></ul><ul><li>Thiols are often found in petroleum, pulp, and paper industries </li></ul><ul><li>Thiols occur naturally such as in onions and garlic oil. </li></ul>
  9. 9. Hazards & Benefits <ul><li>Some thiols are flammable </li></ul><ul><li>Some metal sulfides when exposed to a strong mineral acid, will release toxic hydrogen sulfide. </li></ul><ul><li>Organic sulfides are highly flammable </li></ul><ul><li>Almost all ogranic sulfides have a strong stench which rotting biomass releases also. </li></ul><ul><li>Thiols have the ability to temporarily reduce a person’s ability to smell odors </li></ul>
  10. 10. Hazards & Benefits <ul><li>Thiols are strong irritants and can be toxic at high concentration, and can cause nausea, vomiting, coughing, and lung irritation. </li></ul><ul><li>The active substance in onions, garlic, and and other members of the allium families are allyl sulfides have many health benefits including, protection against caner, lower cholesterol, reduce the risk of blood clots, and heart disease </li></ul>
  11. 11. How Thiols & Sulfides Relate <ul><li>Sulfur analogs of alcohols are called thiols or mercaptans and ether analogs are calle sulfides. </li></ul>
  12. 12. How it relates to other groups <ul><li>Thiols are stronger acids than other alcohols </li></ul>
  13. 13. Works Cited <ul><li>Organic Chemistry Powerpoint by William H. Brown, Christopher S. Foote, Brent L. Iverson </li></ul><ul><li>www.snow.edu/danb/files/organic/ch%2010.ppt </li></ul><ul><li>employment.alberta.ca/documents/WHS/WHS-PUB_ch060.pdf - </li></ul><ul><li>http://www.answers.com/topic/sulfide </li></ul><ul><li>http://findarticles.com/p/articles/mi_m0826/is_1_16/ai_59017937/ </li></ul><ul><li>http://cem.msu.edu/~reusch/VirtualText/special2.htm#top1a </li></ul>

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