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Both isomers of 3,5-dioxo-3,5-diisopropoxy-1,3,5-thiadiphosphorinane have two molecules in the asymmetric unit. The  trans  isomer crystallises in  P [unk] with  a  = 9.635(3) Å,  b  = 10.516(3) å,  c  = 14.146(4) Å,  α  = 93.20(2), Å  β  = 100.28(2) Å,  γ  = 90.18(2)° (at 178 K), final  R ( F ) 0.041. The  cis  isomer crystallises in  P 2 1 / n  with  a  = 8.459(4) Å,  b  = 11.410(4), Å  c  = 29.458(12) Å,  β  = 93.12(3)° (at 293 K), final  R ( F ) 0.046. The rings adopt a chair conformation. All four rings display closely similar dimensions. The P–C–P angles are wide (120°). In the  cis  isomer the bulky substituents are both axial, whereas in the  trans  isomer one substituent is forced to be equatorial.

Structures of the trans and cis isomers of 3,5-dioxo-3,5-diisopropoxy-1,3,5-thiadiphosphorinane