enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Carbene - Wikipedia

    en.wikipedia.org/wiki/Carbene

    Carbene radicals, in which the carbene is bonded to an open-shell metal with the carbene carbon possessing a radical character. Carbene radicals have features of both Fischer and Schrock carbenes, but are typically long-lived reaction intermediates. The "second generation" of the Grubbs catalysts for alkene metathesis features an NHC ligand.

  3. Transition metal carbene complex - Wikipedia

    en.wikipedia.org/wiki/Transition_metal_carbene...

    Examples include (CO) 5 W=COMePh and (OC) 5 Cr=C(NR 2)Ph. Orbital interaction in a Fisher carbene. The carbene electrons are donated to a sigma bond, and weak pi-backbonding occurs. Fisher carbene complexes are related to the singlet form of carbenes, where both electrons occupy the same sp 2 orbital at the carbon. This lone pair donates to a ...

  4. Carbyne - Wikipedia

    en.wikipedia.org/wiki/Carbyne

    Carbyne molecules are generally found to be in electronic doublet states: the non-bonding electrons on carbon are arranged as one radical (unpaired electron) and one electron pair, leaving a vacant atomic orbital, rather than being a triradical (the quartet state).

  5. Transition metal carbyne complex - Wikipedia

    en.wikipedia.org/wiki/Transition_metal_carbyne...

    The net reaction gives a transition metal carbene complex: L n M≡CR + HX → L n (X)M=CHR. These complexes can also undergo photochemical reactions. In some carbyne complexes, coupling of the carbyne ligand to a carbonyl is observed. Protonation of the carbyne carbon and conversion of the carbyne ligand into a π-allyl. [13]

  6. Fischer carbene - Wikipedia

    en.wikipedia.org/wiki/Fischer_carbene

    Bonding between carbene and the metal centre involves a strong σ donation from sp 2 orbital to an empty d orbital on metal centre and a weak π back donation from the metal centre to the empty p z orbital. Because the π donation is weak, the carbene carbon is electrophilic in nature. [1] Because of this bonding property, Fischer carbenes ...

  7. Carmina Burana - Wikipedia

    en.wikipedia.org/wiki/Carmina_Burana

    The Wheel of Fortune from Carmina Burana. Carmina Burana (/ ˈ k ɑːr m ɪ n ə b ʊ ˈ r ɑː n ə /, Latin for "Songs from Benediktbeuern" [Buria in Latin]) is a manuscript of 254 [1] poems and dramatic texts mostly from the 11th or 12th century, although some are from the 13th century.

  8. Methylene (compound) - Wikipedia

    en.wikipedia.org/wiki/Methylene_(compound)

    Methylene (IUPAC name: Methylidene, also called carbene or methene) is an organic compound with the chemical formula CH 2 (also written [CH 2] and not to be confused with compressed hydrogen, which is also denoted CH 2). It is a colourless gas that fluoresces in the mid-infrared range, and only persists in dilution, or as an adduct.

  9. Diazirine - Wikipedia

    en.wikipedia.org/wiki/Diazirine

    The carbene compound may include a bioorthogonal tag or handle by which the protein of interest can be isolated. The protein can then be digested and sequenced by mass spectrometry in order to identify which residues the carbene containing ligand is bound to, and hence the identity of the binding site in the receptor.