Crystal structures of eight- and ten-membered cyclic bis­anisyl­phosphono­thioyl disulfanes and comparison with their P-ferrocenyl analogues

Two new crystal structures of eight- and ten-membered cyclic bis­anisyl­phosphono­thioyl disulfanes, namely 2,5-bis­(4-meth­oxy­phen­yl)-1,6,3,4,2λ(5),5λ(5)-dioxadi­thiadi­phospho­cane-2,5-di­thione, C(16)H(18)O(4)P(2)S(4), and 2,5-bis­(4-meth­oxy­phen­yl)-1,6,3,4,2λ(5),5λ(5)-dioxadi­thia­diphosphecane-2,5-di­thione, C(18)H(22)O(4)P(2)S(4), have been determined and compared to structures of the ferrocenyl analogues. The eight-membered rings have similar conformations (TBC) but the ten-membered macrocycles are differently puckered. Structural parameters of the relevant SPSSPS motif have been analysed and are discussed in detail. Compound 1 was refined as an inversion twin and 2 was refined as a two-component rotational twin.