Treatment of o-quinonemonohydrazone 1 with phosphorus ylides 2a and 2b yielded the pyrazoles 4a,b and 1,4-oxazine 6. Reaction of 1 with 2c and 2d gave exclusively the new ylides 7a,b whereas with ylide 2e, the unexpected pyridazine derivative 11 was obtained.
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Wafaa M. Abdou (1997) studied this question.
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