Formation of 2,3-dihydro-1,3,2-benzoxazaphospholes by cheletropic reaction of o-quinone monoimines with triphenylphosphane. Crystal and molecular structures of 2,3-dihydro-2,2,2-triphenylphenanthro[9,10-d]-1,3,2λ5-oxazaphosphole and 5,7-di-tert-butyl-2,3-dihydro-2,2,2-triphenyl-1,3,2λ5-benzoxazaphosphole

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