Ochem 3
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cyclohexane gives how many H NMR signals
1
as mass increase, frequency (cm-1)
decreases
nucleophile elimination
opposite of addition form a pi bond 1 reactant, 2 product
amide stretching
primary (1 R): 2 peaks secondary (2 R): 1 peak
SN2
nucleophile and electrophile
deshielded protons
chemical shift will increase
anions become more stable as
size increases
% transmittance =
(light detected / light source) *100%
bimolecular elimination (E2)
strong base 3 products need beta hydrogen
nucleophilic addition
attack pi bond lose pi bond 2 reactant, 1 product
Ephoton =
h (constant) * Vphoton (frequency)
heterolysis reaction
break apart single molecule
frequency (cm-1) increases
as bond strength increase
electrophile elimination
remove a H to get double bond
Fragments increase as…
stability of the fragment increases
wave numbers =
1/A (wavelength cm)
electrophilic addition
double or triple CC bond attack a H
Carbon rearangment
move a hydrogen or methyl make sure it’s a 1,2 shift
integration
number of protons under peak, relative number
protons by electronegative atoms
have higher downfield shift
amine stretching
primary (1 R): 2 peak secondary (2 R): 1 peak tertiary (3 R): 0 peak
beta hydrogen
hydrogen attached to beta carbon understand how to find this
resonance is more import than induction because
will cause greater shift
Beff
Bloc + Bext