52 research outputs found
An Unusual Copper Catalyzed Iodine Mediated Aziridination of Olefins with the Direct Use of p
Calix[4]pyrrole as a promoter of the CuCl-catalyzed reaction of styrene and chloramine-T
Calix[4]pyrrole, an easy-to-prepare anion receptor, acts to promote the cuprous chloride-catalyzed aziridination of styrene by the nitrene source chloramine-T in acetonitrile. The mechanism of action is believed to involve incipient anion-receptor interactions involving the calix[4]pyrrole NH protons and the chlorine atom of the CuCl, rather than direct bonding to, and activation of, the chloramine-T Consistent with this supposition were the findings that (1) the use of calix[4]pyrrole, in combination with CuCl, did promote enhanced reactivity when PhI=NTs was used as the nitrene source and (2) the presence of calix[4]pyrrole had no effect on the reaction when Cul was used as a catalyst. Decreased yields were also seen with CuCl2, and no appreciable aziridination product was observed when the calix[4]pyrrole was replaced by an appropriately chosen dipyrromethane control compound. On the other hand, the enhancement effect provided by calix[4]pyrrole proved relatively insensitive to the presence of trace quantities of water
Bacteria in the gular and paracloacal glands of the American alligator (Alligator mississippiensis; Reptila, Crocodilia)
Identification of endogenous gibberellins, and metabolism of tritiated and deuterated GA4, GA9 and GA20, in Scots pine (Pinus sylvestris) shoots
Investigations in the Transition Metal Catalyzed Aziridination of Olefins, Amination, and Other Insertion Reactions with Bromamine-T as the Source of Nitrene
Convenient MetalâFree Aziridination of Alkenes with ChloramineâT Using Tetrabutylammonium Iodide in Water
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