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orgo 2 > other > Flashcards

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1
Q

wavenumber

A

V/C (frequency/speed of light)

(1/2piC)(f/mred)

f=force constant, bond strength inc wavenumer inc.

mred = heaver attoms dec wavenumer

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2
Q

heavyer attoms in IR

A

cause a dec in wavenumer

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3
Q

Bond strength in IR

A

inc wavemenuber

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4
Q

Bond strecgth stronger, bond charatar

A

is more S charatar, smaler orbitals

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5
Q

Csp-H

A

3200

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6
Q

Csp2-H

A

LEFT of 3000

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7
Q

Csp3-H

A

RIGHT of 3000

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8
Q

tripple bond in IR

A

2300-2100

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9
Q

double bond in IR

A

1900-1600

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10
Q

IR fingerprint regon

A

below 1500

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11
Q

IR intesnity

A

inc absorbion inc signal

inc polar bond, inc absorbtion

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12
Q

symetrical in IR

A

may not show up

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13
Q

OH Bonds in IR

A

are broad

because of H bonding

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14
Q

Amines in IR

A

Two signals - symetric and asymetic

primary (NH2)- two N-H singals

Secondary(NH) - 1 N-H bond

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15
Q

Mas spec formula

A

inc mass - dec turn

inc charge - harder turn

mass/charge =M/Z (Z usaly +1) =M

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16
Q

Molecular Ion peak

A

M not stable fragment

is frutherst right (rest/small peaks are from isotopes)

17
Q

Base peak

A

largest set to 100

18
Q

Br mas spec

19
Q

Cl Mass spec

20
Q

High resolution mass spec

A

differntate between small differences (in mol weight)

21
Q

Gass chromotography mass spec

A

take mixture - pull out specific moleucle - cleaned sample

leave in GC at differnt times - analize mas spec

22
Q

Electrospray Ionization

A

ESI

soft ionization

sample disolve in solvent - gives charge

used for large molecules

23
Q

HDI

A

add 1 degree of unsat for every 2 hydrogen atoms mission

add 1H for each halogen

Igonre Oxygen

Subtract one H for each N

24
Q

HDI formula

A

1/2 (2C(# carbons)+2+N(# nitrogens)-H(#hydrogens)-X (# halogens)

25
Q

shielding and dehsilding

A

more e density, shields/protects nuc, more upfield

less e density, dec sheilding more downfield

26
Q

spin

A

nucli with odd number of protins and/or neutrons

27
Q

chem equiv or not

A

methyl (ch3) - equiv

methylene - no sterocenter, equiv. sterocenter - not equiv

28
Q

Integration

A

area under signal - number of protons

devide all by smallest and multiply by two ->ratio

29
Q

1-7 in splitting

A

singlet

doublet

triplet

quartet

quintet

sextet

septet

30
Q

ethyl H NMR

A

2H - 4 peaks, quartet

3H - three peaks - tripelt

31
Q

Isopropl H NMR

A

1H - multiplet

6H - singlet

32
Q

tert butyl H NMR

A

9H - singlet

33
Q

completx couppling

A

number of peaks = (n+1)(n+1)

34
Q

Libel protons

A

produce broad singla

OH, NH

orgo 2 (10 decks)

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