139517-41-2Relevant academic research and scientific papers
Photo-induced ditelluration of acetylenes with diphenyl ditelluride
Ogawa,Yokoyama,Obayashi,Han,Kambe,Sonoda
, p. 1177 - 1188 (2007/10/02)
Diphenyl ditelluride (PhTeTePh) adds to a variety of acetylenes upon irradiation with visible light in the absence of solvent to provide vic-bis(phenyltelluro)alkenes in good yields. The reaction may proceed by a radical-chain mechanism that includes the addition to acetylenes of phenyltelluro radical (phTe·) generated in situ by photolysis of diphenyl ditelluride, followed by the S(H)2 reaction between thus formed β-(phenyltelluro)alkenyl radicals and diphenyl ditelluride. In the cases of unactivated acetylenes such as 1-octyne, the addition proceeds stereoselectively to provide only (E)-vic-bis(phenyltelluro)alkenes. Contrary to this, activated acetylenes like phenylacetylene give rise to a mixture of E- and Z-isomers of vic-bis(phenyltelluro)alkenes. Since the obtained vic-bis(phenyltelluro)alkenes indicate absorption in the near-UV, irradiation with near-UV light in solvent causes a novel reverse reaction of the adducts to the starting acetylenes and diphenyl ditelluride. Accordingly, irradiation with visible light (> 400 nm) under high concentrations of the substrates induces the addition of (PhTe)2 to acetylenes, whereas irradiation with near-ultraviolet (> 300 nm) under dilution condition causes the reverse reaction.
Photo-initiated Addition of Diphenyl Ditelluride to Acetylenes
Ogawa, Akiya,Yokoyama, Kazuyuki,Yokoyama, Hiroshi,Obayashi, Ryoichi,Kambe, Nobuaki,Sonoda, Noboru
, p. 1748 - 1750 (2007/10/02)
Diphenyl ditelluride 2 has been found to add efficiently to various acetylenes 1 upon irradiation with visible light (>400 nm), providing vic-bis(phenyltelluro)alkenes 3 in good yields.
