Abstract
AbstractCondensation of 2‐aminopyridine and chloromethyldichlorophosphane yields 1,3,4‐diazaphospholo[1,2‐a]pyridine 2. Methanol adds to 2 while diethylamine does not; with additional elemental sulfur, in both cases the sulfides 4, 6 of the respective adducts are formed. Hydrolysis of 2 specifically opens the PN‐bond and gives the zwitterionic 2‐aminopyridinio‐methylphosphonite 7. The compound crystallizes with one molecule water in the monoclinic space group P21/c with a = 25.490(7)Å, b = 7.365(4)Å, c = 9.088(3)Å, β = 100.06(3)°, and Z = 8 with two independent molecules of 7 and of water. In the crystal hydrogen bonds connect the molecules of 7 to form double‐chain structured polymers. The individual double‐chains are linked to each other by hydrogen‐bonded water molecules.
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