acs Flashcards

1
Q

is epoxidation stereoselective or regiospecific

A

it is stereoselective only

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2
Q

whats the nitrogen rule for mass spec

A

even masses have either 0 or +2 nitrogen

odd masses have at least 1 nitrogen

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3
Q

where do aldehydes and ketones appear on C13 NMR

A

190-200

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4
Q

where do esters, carboxylic acids and carbonyls appear on 13C NMR

A

160-180

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5
Q

where do alkyne bonds appear on IR

A

2100

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6
Q

where do cyanide bonds appear on IR

A

2100

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7
Q

where do amine bonds appear on IR

A

3400 as a sharp peak

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8
Q

where are triple bonds in C 13 NMR

A

75-90

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9
Q

where are alkene bonds in C12 NMR

A

100-160

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10
Q

in the presence of a strong acid, what happens to sulfate groups on aromatic rings

A

they are removed

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11
Q

when reacting an aromatic chloride with liquid amonia what two products are observed

A

an amine will substitute in place of the chloride or it will substitute meta but never para

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12
Q

what does lithium aluminum hydride to do amides?

A

reduces it to an amine

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13
Q

when reacting an alkene with Br2 and light, what is the resulting reaction

A

allylic substitution

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14
Q

which is a better lewis base? water or a carbonyl?

A

carbonyls tend to act as electrophiles so water is a better lewis base

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15
Q

what reagents will reduce an alkyne to an alkane

A

H2/Pt or H2/Pd

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16
Q

what reagents will reduce an alkyne to a cis alkene

A

lindlars catalyst or H2, Pd/CaCO3

17
Q

what reagents will reduce an alkyne to a trans alkene

A

Metal and hydrogen source or Na/NH3

18
Q

what are the reagents for carbene to make a cyclopropane

A

Zn(cu). Ch2I2

NaOH/CHCl3

Daizomethane

19
Q

why is an amine more nucleophillic than an alcohol

A

it is less electronegative so it is more willing to donate its electrons than an alcohol

20
Q

why is a SH more nucleophillic than an alcohol

A

it is more polarizable

21
Q

what is the general trend for Michael addition products

A

two carbonyls separated by 3 carbons in the middle (1,5) carbonyl

22
Q
A