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Two new crystal structures of eight- and ten-membered cyclic bis-anisyl-phosphono-thioyl disulfanes, namely 2,5-bis-(4-meth-oxy-phen-yl)-1,6,3,4,2λ 5 ,5λ 5 -dioxadi-thiadi-phospho-cane-2,5-di-thione, C 16 H 18 O 4 P 2 S 4 , and 2,5-bis-(4-meth-oxy-phen-yl)-1,6,3,4,2λ 5 ,5λ 5 -dioxadi-thia-diphosphecane-2,5-di-thione, 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.

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