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For IR, what is located 4000-25000 cm-1
N-H,O-H, C-H
IR spectra(4000-500)
How does Mass Spectra work?
gas pushed through waterfall of electrons, causing fragmentation
NMR?
Looks at carbon-Carbon backbone
What does MS measure?
molecular weight
charge to mass ratio measured
What is the Base Peak in MS
Tallest peak (100 %)
most stable peak
What is the parent peak/Molecular ion M+ ?
Peak representing unfragmented radical cation.
On far right-ignoring blip
gives molecular weight
Where is C=O on IR
1670-1780 cm-1
O-H on IR
3400-3650 cm-1
alkyne IR
C-H alkyne bond
2100-2260
3300
C=C IR
RC=CH2
=C-H
1640-1680
910-990
3020-3100
C=O
sharp peak 1670-1780
aromatic compunds
1400-2000
name hydrocarbon aromatic molecules
hydrocarbonbenzene
ie bromobenzene C6H5Br
C6H5 CH2CH2CH3=propylbenzene
Name aromatic ring as substituent
phenyl
ie 2-phenylheptane
name aromatic ring+CH2 as substituent
benzyl
Ortho/meta/pera
adjacent/seperated by 1 C/opposite(sep. by 2C)
Benzene+Br--Fe/catalyst--->?
bromobenzene+HBr
Heat of hydrogenation
more energy=less stable
H2 w/ C=C is 118kJ/mol
how prove benzene more stable with hydrogenation
benzene (206) vs 3 dbl bond (356)
benzene has 150 more stability
benzene structure
planar, 120, each C is sp2, conjugated
Huckle's rule
4n+2 pi electrons means aromatic stability
benzene:4+2=6 b/c 3 dbl bonds=6 pi
anti aromatic
4n pi electrons
pyridine?
N in place of one C of benzene
naming alcohols
number longest chain
start where OH will be lowest number
list substituents in alphabetical order
replace "e" at end with ol
ie2-Methyl-2-pentanol
naming phenols
OH attached to benzene ring
name substituents on ring based upon position from OH
use "phenol" instead of "benzene"
benzyl alcohol=phenymethanol
alcohol and phenol properties
sp3 hybridized
higher boiling point than similar alkanes/ alkyl halides
weakly basic/acidic
protonated by strong acid to yield oxonium ion
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Author
alyspins
ID
23655
Card Set
exam1.txt
Description
chp 12,14,15,16,17 for exam 1 of ochem 2
Updated
2010-06-15T17:45:41Z
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