Friday May 28th, 2010

Yesterday was an interesting class (because of the fact that there was no physical classroom). We saw once more the Hydrocarbons subject, and yesterday (to be more specific) we saw ALKYNES. (every time i hear this word i remember the music video from the 1 semester jajaja).

Well, Alkynes are almost the same as Alkanes and Alkenes, but the differ in one thing: Alkynes have triple bonds. Also, the termination of the Alkynes is different, since their suffix is -dyne or -yne (depending on the prefix); for example: Ethyne

To name an alkyne there's this "importance" of the types of bonds that has to be considered:

1. Double Bond (like the King of the Hill)
2. Triple Bond (i don't know why it has less importance, but that's the way it is)
3. Single Bond

Also, the "Hierchy" in Alkanes, Alkenes and Alkynes it's this (to know exactly from where we have to start counting the carbons):

1. Longest Chain
2. Closes Double Bond
3. Closes Triple Bond
4. Closest Branch
5. Shortest Branch

If a chemical formula is the same in all this 5 characteristics, then they are "Simetrical", and you can start counting from wherever you want, since it would be the same on both sides.

Also, before the class ended, we saw a little about CYCLOALKANES: The only thing that has to worry you in naming this formulas are the quantity of branches that it has, how long it is and how many carbons has the longest "circle", like Methyl Cyclopentane (also, in this Alkanes we have to add the prefix Cyclo- because it's a Cycloalkane).

Homar Hurtado