
TY  - JOUR
A1  - Riggs, NV 
T1  - <i>Ab Initio</i> Studies on Amides: Pyrrolidin-2-one (&#947;-Butyrolactam)
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1985
VL  - 38
IS  - 11
SP  - 1585
EP  - 1589
KW  - 
UR  - https://doi.org/10.1071/CH9851585 
N2  - By optimization with the 3-21G basis set, pyrrolidin-2-one is found clearly to prefer an envelope conformation with the flap bent 27.4&#176; out of the NC(=O)C reference plane. The ring may be bent or twisted through a few degrees at low energy-cost, and undergoes rapid inversion through a planar-ring structure lying only 3.3 kJ mol-1 above the preferred equilibrium structure. 
ER  -

