Lecture 8 with ink

Lecture 8 with ink - Lecture 8 Combined Spectra Optical...

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Lecture 8
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Combined Spectra Optical Activity
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Often, one form of characterization is not enough to deduce the structure IR can give you functional group info, but not necessarily connectivity or quantity NMR can give you quantity and connectivity, but determining functionality may be unclear MS can tell you molecular weight and functionality, but fragmentation can be complicated
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Determine the molecular formula if you can Use rule of 13 if a M + molecular ion is given Calculate the “Degrees of Unsaturation” (U) U=[(2C+2)-H]/2 C = # of carbons H = # hydrogens + halogens Nitrogen atoms count as ½ carbon atom Other atoms (sulfer, oxygen) don’t count U=0 means no double bonds or rings U=1 one double bond or ring U=2 one triple bond or many possibilities U=3 multiple possibilities U=4 often an aromatic ring, but can be combo
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Molecular Ion peak in MS is 86 and has 1 oxygen atom, what is the molecular formula? What is U?
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This note was uploaded on 04/09/2010 for the course CHEM 6a taught by Professor Pettus during the Fall '07 term at UCSB.

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Lecture 8 with ink - Lecture 8 Combined Spectra Optical...

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