Abstract
The title reactions begin with the attack on the aldonitronyl group by the nitrogen atom α to the ylidic carbon, to give, presumably, a cyclic species, which splits off a nitroso compound to afford indazolyl-2-methylenetriphenylphosphorane. In one case the primarily formed cyclic species underwent a further intra molecular cyclization to imidazo[1,2-b] indazole.
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