Compound
4a
4b
4c
4d
4e
-R
-H
P-Br
P-OCH
3
P-CH
3
P-NO
2
Compound
5a
5b
5c
5d
5e
-R
1
-H
P-Br
P-OCH
3
P-Cl
M-NO
2
Table 1:
2,6-dihydro-2,6-diimino-4,8-bis (substituted) pyrimido [2,1b][1,3] thiazine-3,7- dicarbonitrile.
