Journal
DOKLADY CHEMISTRY
Volume 510, Issue 2, Pages 142-148Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0012500823600438
Keywords
isoxazole; benzimidazole; benzothiazole; thiadiazole; cyclic phosphines; 1; 5; 3; 7-diazadiphosphacyclooctanes
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New 1,5,3,7-diazadiphosphacyclooctanes with N,O-, N,N-, N,S-, and N,N,S-heterocyclic substituents at the nitrogen atoms have been synthesized. The influence of the ortho-position of the heterocyclic substituent on the result of Mannich condensation in phosphine-paraformaldehyde-primary amine system has been revealed. The low yield of the target cyclic diphosphines based on the above amines is due to the stabilization of intermediate acyclic products-aminomethyl(hydroxymethyl)arylphosphines and bis(aminomethyl)arylphosphines through amino-imine tautomerism.
New 1,5,3,7-diazadiphosphacyclooctanes with N,O-, N,N-, N,S-, and N,N,S-heterocyclic substituents at the nitrogen atoms have been synthesized. The influence of the nature of amines containing sp(2)-hybridized nitrogen atom in the ortho-position of the heterocyclic substituent on the result of Mannich condensation in phosphine-paraformaldehyde-primary amine system has been revealed. The stabilization of intermediate acyclic products-aminomethyl(hydroxymethyl)arylphosphines and bis(aminomethyl)arylphosphines-due to amino-imine tautomerism is responsible for the low yield of the target cyclic diphosphines based on the above amines.
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