Abstract
Crystals of 1-hydroxycyclodecyl dimethyl phosphonate are triclinic with space group P 1 . The unit cell dimensions are a = 10·86; b = 13·15; c = 8·467 Å; α = 111sd65°; β = 76·09°; γ = 141·41°. The structure was solved by the symbolic addition procedure and refined with anisotropic temperature factors by the least-squares method to a conventional R index of 0·057 (Rω = 0·066). The ring conformation is boat chair boat. A comparative study of the conformations of cyclodecanone and 1-hydroxy cyclodecyl dimethyl phosphonate has shown that it is probably a less stable form of cyclodecanone which reacts during the addition of dimethyl phosphite. Each molecule is bonded to its centrosymmetric homologue through two hydrogen bonds (2·719 Å).
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