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The crystal structures of 5a 4-methoxy-2,3-dimethyl-2,4-dihydro[1,2]benzoxaphosphinino-[4,3-c]pyrazole-4-oxide and 5b 2,3-dimethyl[1]benzopyrano[4,3-c]pyrazol-4-one have been determined by 31 P and 1 H NMR study and single-crystal X-ray diffraction. The progress of conversion of chromone 1a was monitored by 31 P NMR. After 24h two additional signals of 4a and 5a could be seen...
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