75-19-4Relevant articles and documents
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Kaplan
, p. 1753 (1967)
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Haehn
, p. 518 (1907)
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Masri,Blass
, p. 21,23-26 (1971)
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Hemminger et al.
, p. 1867 (1971)
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Nickel-Catalyzed Cyclopropanation with NMe4OTf and nBuLi
Künzi, Stefan A.,Sarria Toro, Juan Manuel,Den Hartog, Tim,Chen, Peter
supporting information, p. 10670 - 10674 (2015/09/02)
Nickel was identified as a catalyst for the cyclopropanation of unactivated olefins by using in situ generated lithiomethyl trimethylammonium triflate as a methylene donor. A mechanistic hypothesis is proposed in which the generation of a reactive nickel carbene explains several interesting observations. Additionally, our findings shed light on a report by Franzen and Wittig published in 1960 that had been retracted later owing to irreproducibility, and provide a rational basis for the systematic development of the reaction for preparative purposes as an alternative to diazomethane or Simmons-Smith conditions.
GASEOUS DIELECTRICS WITH LOW GLOBAL WARMING POTENTIALS
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, (2010/12/31)
A dielectric gaseous compound which exhibits the following properties: a boiling point in the range between about ?20° C. to about ?273° C.; non-ozone depleting; a GWP less than about 22,200; chemical stability, as measured by a negative standard enthalpy of formation (dHf0); a toxicity level such that when the dielectric gas leaks, the effective diluted concentration does not exceed its PEL; and a dielectric strength greater than air.