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The stabilities and reactive properties of 1.1.1 propellane and bicyclo 1.1.1 pentane are analyzed by means of calculated electrostatic potentials and bond deviation indices. These were computed from ab initio SCF minimum-basis-set molecular wave functions, using geometries determined by optimization at the 6-31G* level. 1.1.1 Propellane has rather unusual regions of relatively strong negative electrostatic potential to the outsides of the bridgehead carbons, those commonly described as inverted. These carbons are viewed here as being somewhat unsaturated, with no direct bonding between them. They should be attractive sites for electrophilic attack, and it is suggested that they may also be reactive toward radicals. Bicyclo 1.1.1 pentane has a less strained structure, and the electrostatic potentials and bond deviation indices reveal the C-C bonds to have some similarity to those in cubane.