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The N, N′‐annulated dichlorodiazaphosphole 1 was prepared in 55 % yield by the reaction of cyclohexanone azine (c‐HA) with two equivalents of PCl3 in pyridine. Compound 1 revealed one‐dimensional chains in crystal with short intermolecular interactions [3.194(1) Å] between phosphorus atoms of adjacent molecules. Treatment of c‐HA with MeLi (2 equiv. in Et2O) followed by addition of PCl3 gave 1 in...
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