20. IDENTIFY THE MISSING DIPOLES, DIPOLAROPHILES AND CYCLOADDUCTS
1
i, NaNO2/ HCl Ph Ph
Ph NH2
ii, NaN3
2
CN
i, NaNO2/HCl heat
ii, NaN3
NH2
Ph CO2Et
3
NH i, POCl3
HN ii, Et3N
EtO2C
O
O
4 OH i, Cl2 O
O N
N ii, Et3N CH3
H3 C H iii. H3 C
H3 C H
CH3
5
O O O
NO2
excess PhNCO
Ph
6
OH O
N
N O
i, NaOCl
ii, Et3N Et CH2Ph
Et H

21. IDENTIFY THE MISSING DIPOLES, DIPOLAROPHILES AND CYCLOADDUCTS
OH O
7
N i, NCS
O
ii, Et3N
EtO2C H
8 O t
BuNHOH
Me H
9 CHO PhNHOH
H CO2Me
O PhCH2 O
N (exo)
10
OMe H
11
OMe H
N
HCl O
(exo)
NHOH
12 Ph
NH
N heat
Ph H