Crystal structure of the cage derivative penta­cyclo­[5.4.0.0^2,6.0^3,10.0^5,9]undeca-8,11-dione ethyl­ene di­thio­ketal

The penta­cyclo­undecane cage derivative exhibits unusual Csp³-Csp³ single bond lengths ranging from 1.495 (3) to 1.581 (2) and strained bond angles as small as 89.29 (12) and as large as 115.11 (11)°.

Crystal structures of 3,6-di­allyl­tetra­cyclo[6.3.0.0^4,11.0^5,9]undeca-2,7-dione and 1,7-di­allyl­penta­cyclo­[5.4.0.0^2,6. 0^3,10.0^5,9]undecane-8,11-dione: allyl­ated caged compounds

The crystal structures of two allyl­ated caged mol­ecules and the correlation of bond distances and feasibility of ring-closing metathesis is discussed.

Crystal structure of 1,3-diallyl-1,3,3a,4,7,7a-hexa­hydro-4,7-methano-2-benzo­thio­phene 2,2-dioxide

The title compound C₁₅H₂₀O₂S, was identified as a product of di­allyl­ation of the meso-isomer of the corresponding norbornene sulfone, and it is an achiral compound. The five-membered heterocycle adopts an envelope conformation with the S atom deviating by 0.795 (3) Å from the other atoms of the ring (r.m.s. deviation = 0.0131). Both allyl groups are anti-oriented relative to the S atom but their double bonds are directed in opposite directions relative to the plane of the heterocycle.