Multifunctional phosphane and phosphane oxide ligands derived from p-tert-butylcalixarene. Synthesis of a large diphosphane with C2 symmetry and behaving as a cis or trans binding ligand

Article abstract of DOI:10.1016/0022-328X(94)84035-0

The calix<4>arene derived di(phosphane oxide) 2 (cone conformation) was obtained in 78percent yield by treatment of 1 with 2 equiv NaO-t-Bu followed by reaction with 2 equiv Ph2P(O)CH2OTs.When KO-t-Bu was used instead of NaO-t-Bu, the partial cone isomer