Synthesis and single-crystal X-ray diffraction structures of (3,5-tBu 2 -C 6 H 3 ) 3 P, (3,5-tBu 2 -C 6 H 3 ) 3 PO·H 2 O, (3,5-tBu 2 -C 6 H 3 ) 3 PS and (3,5-tBu 2 -C 6 H 3 ) 3 PSe are reported. The structure of (3,5-tBu 2 -C 6 H 3 ) 3 P has Z′ = 4, with both M and P enantiomers of a helical conformation and a conformation with one flat ring in the same lattice. The pyramidality index, Σ{∠CPC}, is smaller for the helical compared to the flat conformers. All four have structures that are more pyramidal than the corresponding Ph 3 P(E) derivatives, which is attributed to stronger intramolecular dispersion forces. The oxide crystallizes with Z′ = 2 as a water-bridged dimer that is the most separated such dimer [a]
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.