TEST 1 Flashcards
Mass spec uses
find molecular weight and fomula
mass spec uses what to work
high energy electrons bombard the compound and fragment it
M peak
weight of molecule on graph
Base peak
tallest peak
mass spec only detects what
charge particles
chlorine on mass spec
3:1 ratio
35 & 37
bromine on mass spec
1:1 ratio
79 & 81
aldehydes and ketones in mass spec
alpha cleavage
alcohols in mass spec
alpha cleavage and dehydration (lose h2o, 18 amu from m peak)
amines in mass spec
alpha cleavage
mass spec m/z meaning
mass to charge ratio
DOU equation
((2C+2)-H-X+N)/2
C13 nmr detects what
only c13
1-2 additions
occur in conjugated dienes
kinetic product
1-4 additions
occur in conjugated dienes
thermodynamic product, hydrogen bonds to one end, the double bond moves then the carbocation end is taken by the halogen
diel alder reactions
happens between a s-cis double bond and another double bond
bromine bonding and radicals
bromine & radicals only bond to the weakest H bond in the compound. So 3>2>1. 1 being the strongest
chlorine bonding and radicals
bonds anywhere in 1:1 ratio
M+1 peak
isotopic peak
what makes a compound IR active
assymetrical stretches/rotations
hookes law
stronger bonds-stronger frequency absorbed
what indicates alkanes on mass spec
increments of 14 between each peak
on hydrogen nmrs, what doesnt show up correctly
always check the number of peaks. if there is to few number of peaks for the correct number of hydrogen, it is likely it will be bonded to a O or N
