Structure of 5-(diphenylphosphino)uracil

The observed and energetically feasible crystal structures of 5-substituted uracils

“…a series of single and double N-HÁ Á ÁO interactions (double hydrogen bond interactions formed through N3 and O2) but with a free oxygen acceptor in the 2-position. 63 An alternative brick wall 6,3-net (Scheme 3d) is formed by 5-(diphenylphosphino)uracil 64 and 5-[1-(3-methoxycarbonyl-S-ethylpseudothioureido)]uracil 42 again through a series of single and double N-HÁ Á ÁO interactions (double hydrogen bond interactions formed through N3 and O1, with single hydrogen bonds formed between N1 and O2). The 5-nitrouracil 1,4-dioxane solvate 27 (Scheme 3e) forms a herringbone 6,3-net which utilizes all of the available uracil donors and acceptors (double hydrogen bond interactions formed through N1 and O1).…”