A carboxamide can be produced in a high yield by a method for producing a carboxamide, for example, represented by formula (4):
(wherein R
1
and R
3
are as defined below), the method comprising a step of allowing a carboxylic acid ester represented by formula (1):
(wherein R
1
represents an optionally substituented C
1
-C
20
hydrocarbon group or an optionally substituented C
3
-C
20
heterocyclic group, and R
2
represents an optionally substituented C
1
-C
20
hydrocarbon group), an amine represented by formula (2):
R
3
—NH
2
(2)
(wherein R
3
represents a hydrogen atom or an optionally substituented C
1
-C
20
hydrocarbon group), and a formamide compound represented by formula (3):
(wherein R
3
is as defined above) to react in the presence of a metal alkoxide.
analysis clearly shows that variance in the spacer functional group has a major impact on density, conformational preference, coordination environment and geometric modes. Furthermore, inter- and intramolecularinteractions in crystal packing also influence the defining parameters of conformation, leading to better aromatic-involved interactions both energetically and geometrically.