1.
2.
R
N N O
N N
N N
Ar
N
N
N
S
(Ia)
Ar
N
(Ib)
S
R
1
Ar
N
N
N
S
CH Ar
1
(II)
Ar
N
N
S
Ar
N
N
S
R
1
(IV)
Ar
2
N N
(III)
Ar
O
N
S
Ar = X S ; X= H, Cl, Br
HN
R
3 O
O
(V)
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Project Director,
Prof Dr IOANA SARAMET