Stereochemistry of seven-membered heterocycles Communication 12. Flexible form of tetrachlorophthalylformal and dipole moment of COCOC fragment in γ1 conformation

Abstract

1. According to IR and13C NMR spectroscopic data, tetrachlorophthalylformal exists in the flexible form. 2. By the use of tetrachlorophthalyl sulfite as a model compound, the relative conformational energy of the tetrachloro-o-xylylene fragment has been determined to be -0.70±0.15 kcal/mole. 3. The group DM of the COCOC fragment in the gg1 conformation has been determined experimentally, and its components have been analyzed. © 1984 Plenum Publishing Corporation.