Greetings,
This post discusses naming of a diene hydrocarbon. A diene contains two double bonds. We'll focus on molecules with the double bonds at least one carbon atom removed from the ends. There are two general types of naming encountered:
1) No alkyl branches across the double bond (Use 'cis' and 'trans' convention)
2) One or two alkyl branches across the double bond ('E' or 'Z' designations)
When viewing the molecule with the double bonds arranged horizontally, 'Z' is used when the attached groups forming the main chain are both on top or both on the bottom. When the the primary chain constituents are arranged diagonally across the double bond, 'E' is used. 'Z' represents the German word, zusammen, which means 'same', as in "same side". 'E' represents 'entgegen', which is German for 'opposite', as in "opposite diagonally". For a diene molecule of type "2)", from above, the E and Z notations appear twice at the beginning of the compound name. Follow the video link below to see the naming process using a Ball-and-Stick model.
The video can be paused by clicking anywhere in the viewing area. The very end shows the molecule spinning, which provides a better look at the overall structure.
A few more words about the structure: The structure in the video is the author's creation and does not necessarily depict an actual compound; although it is likely that the compound, due to the incredible bonding-versatility of carbon, does exist in nature and/or has or could be synthesized in the lab. Additionally, the structure used contains a conjugated bond array, meaning that alternating single and double bonds are part of the molecular bonds between carbon atoms.
Conjugated bonding within an organic molecule can increase stability of a compound and allows for the absorbance of light energy, in the ultra-violet to visible wavelength range.
That's all!, or auf Deutsch, Das ist alles!
As always, thank you for reading!
A Publication of http://ExcellenceInLearning.biz
This post discusses naming of a diene hydrocarbon. A diene contains two double bonds. We'll focus on molecules with the double bonds at least one carbon atom removed from the ends. There are two general types of naming encountered:
1) No alkyl branches across the double bond (Use 'cis' and 'trans' convention)
2) One or two alkyl branches across the double bond ('E' or 'Z' designations)
When viewing the molecule with the double bonds arranged horizontally, 'Z' is used when the attached groups forming the main chain are both on top or both on the bottom. When the the primary chain constituents are arranged diagonally across the double bond, 'E' is used. 'Z' represents the German word, zusammen, which means 'same', as in "same side". 'E' represents 'entgegen', which is German for 'opposite', as in "opposite diagonally". For a diene molecule of type "2)", from above, the E and Z notations appear twice at the beginning of the compound name. Follow the video link below to see the naming process using a Ball-and-Stick model.
The video can be paused by clicking anywhere in the viewing area. The very end shows the molecule spinning, which provides a better look at the overall structure.
A few more words about the structure: The structure in the video is the author's creation and does not necessarily depict an actual compound; although it is likely that the compound, due to the incredible bonding-versatility of carbon, does exist in nature and/or has or could be synthesized in the lab. Additionally, the structure used contains a conjugated bond array, meaning that alternating single and double bonds are part of the molecular bonds between carbon atoms.
Conjugated bonding within an organic molecule can increase stability of a compound and allows for the absorbance of light energy, in the ultra-violet to visible wavelength range.
That's all!, or auf Deutsch, Das ist alles!
As always, thank you for reading!
A Publication of http://ExcellenceInLearning.biz
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