4-OCTYNE......COCK WILL REACH YOU NMR

 
4-OCTYNE
Formula: C₈H₁₄

 COCK WILL REACH YOU NMR

C₈H₁₄
8 - 14/2 + 1 = 2 degrees of unsaturation.
Look for any 2 of pi bonds or aliphatic rings.

The bands at 3000-2850 indicate C-H alkane stretches. There really aren't many other bands in the spectrum to indicate functional groups. The compound is an alkyne; we would expect to see a carbon-carbon triple bond stretch at 2260-2100, however, this is a weak band at best and often does not show up on IR.

This is the structure. See if you can assign the peaks on your own.

Show NMR answer

The integral values for A, B, and C need to be multiplied by 2 to get a total of 14 protons in the molecule. By convention, integral values on an NMR spectrum are reported as the lowest common multiple.

 
 


 
 


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IR Spectra of 1-Octyne and 4-Octyne

 The IR spectrum of 1-octyne shows characteristics absorptions at 3313 cm-1 and at 2119 cm-1. (b) Neither of this absorptions are seen in the spectrum of 1-octyne.

Terminal alkynes have a characteristic C-H (alkynyl) stretch at around 3300 cm-1 and a C-C triple bond stretch at around 2100 - 2200 cm-1. Internal alkynes cannot exhibit the acetylenic C-H stretch. The very small dipole moment of the disubstituted triple bond limits the stretching and makes the C-C triple band bond not visible.