[摘要]：The synthesis and I lie X-ray structure of the three new N-(arylcarbonyl)-substituted derivatives 2a-2c of (2 R)-bornane-10,2-sultam are presented and discussed. Direct comparison of the solid-state analyses shows that the dipole-directed SO2/C=O anti-/syn-conformations may be very sensitive to weak electronic/electrostatic repulsions of the heteroatom lone pairs. The optimum interactions are reached when the lone pair of the beta-positioned heteroatom is oriented in the O(3)=C(11)-N(1) plane. Such rare syn-conformations may lie observed with at least Lip to 1.8 kcal/mol higher energy its compared to their ground states. Additionally. these anti/syn-conformations are also very sensitive to external influences such its, for example, the crystal-packing forces.
