Search results
Results from the WOW.Com Content Network
Allogenes is a series of Gnostic texts. [1] [2] The main character in these texts is Allogenes (Greek: ἀλλογενής), which translates as 'stranger,' 'foreigner,' or 'of another race.' [3] [4] The first text discovered was Allogenes as the third tractate in Codex XI of the Nag Hammadi library. [5]
This suggests an origin for the efficacy of NHC transfer chemistry from Ag NHC complexes, with weaker M-NHC bonds in addition to the straightforward synthetic route described previously. [5] Further charge-decomposition analysis of the three model complexes suggests that the- major contribution to covalent bonding arises from the NHC to M σ ...
A Generic NHC Boryl Anion. An N-heterocyclic carbene boryl anion is an isoelectronic structure of an N-heterocyclic carbene (NHC), where the carbene carbon is replaced with a boron atom that has a -1 charge. [1] NHC boryl anions have a planar geometry, and the boron atom is considered to be sp 2-hybridized.
1,3-Dimesityl-imidazol-4,5-dihydro-2-ylidene, a representative persistent carbene. A persistent carbene (also known as stable carbene) is an organic molecule whose natural resonance structure has a carbon atom with incomplete octet (a carbene), but does not exhibit the tremendous instability typically associated with such moieties.
Allogenes: 40–44: Allogenes: The title is at the end of the tractate. The account of Allogenes of a revelation received from the angel Jude, and of an ascent to heavenly beings. 47: 4: Hypsiphrone: 45–69: Hypsiph. The title is at the beginning of the text, which is very poorly preserved. The book of visions of Hypsiphrone. 48 NHC-XII 1: The ...
In coordination chemistry, a transition metal NHC complex is a metal complex containing one or more N-heterocyclic carbene ligands. Such compounds are the subject of much research, in part because of prospective applications in homogeneous catalysis. One such success is the second generation Grubbs catalyst. [1] IMes is a popular NHC ligand.
The most studied mesoionic carbenes are based on imidazole and are referred to as imidazolin-4-ylidenes. These complexes were first reported by Crabtree in 2001. [7] The formation of imidazolin-4-ylidenes (MIC) instead of imidazolin-2-ylidenes (NHC) is typically a matter of blocking the C2 position.
Pd-NHC complexes used in Sonogashira cross-coupling effect temperature stability in the complex. [9] As in other Pd-NHC mediated cross-coupling reactions, the use of Pd-NHC complexes also allow higher turnover numbers than their NHC-free counterparts. [10] NHC-palladacycles permit copper-free Sonogashira reactions to be carried out. [11] [12]