(Biphenyl-2,2′-di­yl)di-tert-butyl­phos­phonium trifluoro­methane­sulfonate

To aid in the elucidation of catalytic reaction mechanism of palladacycles, we found that reaction of trifluoro­methane­sulfonic acid with a phosphapalladacycle resulted in elimination of the palladium and formation of the title phospholium salt, C₂₀H₂₆P⁺·CF₃SO₃⁻. Selected geometrical parameters include P—biphenyl (av.) = 1.801 (3) Å and P—t-Bu (av.) = 1.858 (3) Å, and significant distortion of the tetra­hedral P-atom environment with biphen­yl—P—biphenyl = 93.93 (13)° and t-Bu—P—t-Bu = 118.82 (14)°. In the crystal, weak C—H...O inter­actions lead to channels along the c axis that are occupied by CF₃SO₃⁻ anions.

P,P-Bis[4-(dimethyl­amino)­phen­yl]-N,N-bis­(propan-2-yl)phosphinic amide

The mol­ecular structure of the title compound, C₂₂H₃₄N₃OP, adopts a distorted tetra­hedral geometry at the P atom, with the most noticeable distortion being for the O—P—N angle [117.53 (10)°]. An effective cone angle of 187° was calculated for the compound. In the crystal, weak C—H...O inter­actions create infinite chains along [100], whereas C—H...π inter­actions propagating in [001] generate a herringbone motif.

rac-[2-(Dicyclohexylphosphanyl)phenyl](phenyl)phosphinic diisopropyl­amide–borane hemihydrate

In the title compound, C₃₀H₄₈BNOP₂·0.5H₂O, the water molecule is disordered about an inversion centre. Both phospho­rus atoms shows distortions in their tetra­hedral environments with the cyclo­hexyl substituents disordered over two orientations in a 0.851 (3):0.149 (3) occupancy ratio. The crystal structure is assembled via O—H...O inter­actions between pairs of phosphininc amide mol­ecules and water molecules, creating hydrogen-bonded dimers with graph-set R₂⁴(8) along [001]. Weak C—H...O inter­actions are also observed.