Crystal structure of O -isopropyl [bis(trimethylsilyl)amino]( tert -butylamino)phosphinothioate

[Bis(trimethylsilyl)amino]( tert -butylimino)thiophosphorane reacts in benzene with isopropyl alcohol via 1,2-addition of an i PrO–H bond across the P=N bond, resulting in the title compound, C 13 H 35 N 2 OPSSi 2 . In the molecule, the P atom possesses a distorted tetrahedral environment involving two N atoms from (Me 3 Si) 2 N– and t BuNH– groups, one O atom from an i PrO group and one S atom, therefore the molecule has a stereocenter on the P atom but crystal symmetry leads to a racemate. In the crystal, a pair of enantiomers form a centrosymmetric dimer via a pair of N—H...S hydrogen bonds.