Crystal structure analysis establishes the configuration of one of two
isomers of the thermal dimerization of ,2,2-trifluoroethenyl)-4-pheno
xyphenyl]phthalimide to be trans-5,5'-[1,2,3,3,4,4-hexafluorocyclobuta
ne-1 2-diylbis(2-phenoxyphenyl)]-N,N'-bis(phthalimide), C44H24F6N2O6.
The cyclobutane ring puckers and has a dihedral angle of 23.5(4)degree
s. The crystal also contains a diethyl ether molecule of solvation, C4
H10O.