THE REACTION OF 2,4-BIS(4-METHOXYPHENYL)-l,3,2,4-D1THIA DIPHOSPHETANE-2,4-DISULFIDE (LR) WITH COUMARIN OXIME AND HYDRAZONE DERIVATIVES. SYNTHESIS OF BENZOPYRANO (3,2-D)-Δ⁵-2,1,3-OXAZA- AND 1,2,3-DIAZA-PHOSPHOLINES

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