Synthesis and Characterization of Antiapicophilic Arsoranes and Related Compounds

Utilizing bulky bidentate ligand systems with C2F5 and n-C3F7 groups,
antiapicophilic arsoranes (5b and 5c, respectively)
were synthesized. A kinetic study on the isomerization of these arsoranes
to their more stable isomers showed that the barriers increased in
the order of CF3 < C2F5 < n-C3F7 in accord with their steric
bulk. It was also revealed that the degree of freezing isomerization
was larger for the change from CF3 to C2F5 than from C2F5 to n-C3F7, obvious from the differences in activation
free energy at 363 K of 1.6 and 0.3 kcal mol–1,
respectively. X-ray structural analysis of several precursors of these
two systems disclosed the unique structures of these compounds.