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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.
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).
A rhyme scheme is the pattern of rhymes at the end of each line of a poem or song.It is usually referred to by using letters to indicate which lines rhyme; lines designated with the same letter all rhyme with each other.
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 ...
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.
A Fischer carbene is a type of transition metal carbene complex, which is an organometallic compound containing a divalent organic ligand. In a Fischer carbene, the carbene ligand is a σ-donor π-acceptor ligand. Because π-backdonation from the metal centre is generally weak, the carbene carbon is electrophilic.
A mesostic is a poem or other text arranged so that a vertical phrase intersects lines of horizontal text. It is similar to an acrostic, but with the vertical phrase intersecting somewhere in the midst of the line, as opposed to the beginning of each line.