Carbon materials like activated carbon (AC) undergo chemisorption with O to give species with electron deficiency in the carbon skeleton and negative charge at the oxygen end that upon reaction with PPh and benzoic acid afford PhP═O. Whereas amine donors react with O-chemisorbed AC and nucleophiles to give dehydrogenatively coupled products in 67-89% yields via the corresponding radical cation and iminium ion intermediates, the reactions using β-naphthoxide derivatives give the corresponding oxidatively coupled bi-2-naphthol products in 68-95% yields.
1,2-Diarylacenaphthylene, 9,10-diarylphenanthrene and 9,10-diarylanthracene derivatives were obtained in good yields (61-92%) in short reaction times (5-30 min) from the corresponding diols with the titanium(III) reagent prepared in situ using the TiCl 4 /Et 3 N reagent system in dichloromethane at 25°C.
Organo-selenium compounds S 0130 Synthesis and Characterization of 5-(Cyclohexylsulfanyl)-4-aryl-1,2,3-selena/ thiadiazoles. -The title compounds (IV), and (V) are obtained from corresponding α-sulfanyl semicarbazones (III). -(SARAVANAN, S.; NAMITHARAN, K.; MUTHUSUBRAMANIAN*, S.; Indian J.
Synthesis and Characterization of 5-Heteroarylsulfanyl-4-aryl-1,2,3-selena/thiadiazoles. -The reaction of heteroarylthio substituted semicarbazones (I) and (III) with thionyl chloride and selenium dioxide affords the corresponding thia-(II) and selenadiazoles (IV), respectively. -(MANIKANNAN, R.; SHANMUGARAJA, M.; MANOJVEER, S.; MUTHUSUBRAMANIAN*, S.; J.
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