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• W2086878889 endingPage "967" @default.
• W2086878889 startingPage "957" @default.
• W2086878889 abstract "Two types of diphenyldiazomethanes having two trifluoromethyl and two bromine groups at the ortho positions, either in unsymmetrical or in symmetrical fashion, that is, (2,6-dibromo-4-phenylphenyl)[4-phenyl-2,6-bis(trifluoromethyl)phenyl]diazomethane (U-1−N2) and bis(2-bromo-4-phenyl-6-trifluoromethylphenyl)diazomethane (S-1−N2), are prepared. Triplet diphenylcarbenes (U-31 or S-31) are generated from those precursors and are characterized by ESR, UV/vis spectroscopy at low temperature, as well as time-resolved UV/vis spectroscopy at room temperature. Those carbenes are shown to be at least 2 orders of magnitude less reactive than the most stable triplet diphenylcarbene thus far known, that is, bis(2,6-dibromo-4-phenylphenyl)carbene. It has been also shown that S-31 is significantly more stable than U-31 even though both have the same two kinds of substituents. It is suspected that the perpendicular alignment of the two most bulky groups is a more effective way to shield the carbenic center than the planar one. By this way, triplet substituted diphenylcarbene surviving nearly a day in solution at room temperature is realized for the first time." @default.
• W2086878889 created "2016-06-24" @default.
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• W2086878889 date "2005-12-31" @default.
• W2086878889 modified "2023-10-16" @default.
• W2086878889 title "Triplet Diphenylcarbenes Protected by Trifluoromethyl and Bromine Groups. A Triplet Carbene Surviving a Day in Solution at Room Temperature" @default.
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• W2086878889 doi "https://doi.org/10.1021/ja056575j" @default.
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