A Novel and Highly Regioselective Synthesis of New Carbamoylcarboxylic Acids from Dianhydrides

Table 1

Yields for bis(carbamoylcarboxylic) acids.

Amine	Products
	3	6
A	92	>98
B	60	68
C	63	89
D	>98	82
E	83	63
F	85	90
G	>98	80
H	>98	86
I	>98	>98
J	96	82
K	63	86
L	74	71
M	>98	84
N	98	98