... ofstronger resonance stabilization by the strong electron-withdrawing groups (R = CN and NO2) and thehydrogen bonding between the leaving group nitrogenand the main chain carbonyl of GlnB23 ... leaving group affect thestructure of the second transition state. It is shown that the main chain car-bonyl group of GlnB23 forms a hydrogen bond with the leaving groupnitrogen, thus influencing ... Trucks GW, Schlegel HB, Scuseria GE,Robb MA, Cheeseman JR, Zakrzewski VG, Montgom-ery JA, Stratmann RE, Burant JC et al. (1998)Gaussian 98 (Revision A.7). Gaussian, Inc., Pittsburgh,PA.29 Peng...