Reaction of 2‐Imino‐2 H ‐chromene‐3‐carboxamide with Phosphorus Isothiocyanates: First Synthesis of Novel Chromeno[2,3‐ d ]pyrimidinyl and Bis(chromeno[2,3‐ d ]pyrimidinyl)phosphines and Chromeno[2′,3′:4,5]pyrimido[2,1‐ d ][1,3,5,2]triazaphosphinine

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