1,5-bis(diphenylphosphanyl)-3,3-dimethylpentane-1,5-dione

1,6-bis(diphenylphosphanyl)hexane-1,6-dione

1,7-bis(diphenylphosphanyl)heptane-1,7-dione

1,8-bis(diphenylphosphanyl)octane-1,8-dione

1,1,6,6-tetrakis(diphenylphosphoryl)hexane-1,6-diol