A persistent carbene (also known as stable carbene) is an organic molecule whose natural resonance structure has a carbon atom with incomplete octet (a...
62 KB (6,933 words) - 11:59, 13 August 2024
exception are the persistent carbenes, which have extensive application in modern organometallic chemistry. There are two common methods for carbene generation...
22 KB (2,401 words) - 05:50, 13 August 2024
transition metal carbene complex is an organometallic compound featuring a divalent carbon ligand, itself also called a carbene. Carbene complexes have...
20 KB (1,995 words) - 05:52, 13 August 2024
coinage metal center (M = Cu, Ag, Au) ligated by at least one NHC-type persistent carbene. A variety of such complexes have been synthesized through deprotonation...
24 KB (2,695 words) - 02:20, 25 January 2024
Radical (chemistry) (redirect from Persistent radical)
Carbenes in their triplet state can be viewed as diradicals centred on the same atom, while these are usually highly reactive persistent carbenes are...
40 KB (4,613 words) - 06:59, 17 October 2024
with a carbene precursor. An early pioneer was Christoph Grundmann reporting on a carbene dimerisation in 1938. In the domain of persistent carbenes the...
3 KB (362 words) - 20:09, 2 February 2024
New Haven County, a county in Connecticut, US N-Heterocyclic carbene, a persistent carbene, commonly used as ligand in organometallic chemistry Nag Hammadi...
1 KB (157 words) - 10:28, 18 October 2024
Triazol-5-ylidene (category Carbenes)
The triazol-5-ylidenes are a group of persistent carbenes which includes the 1,2,4-triazol-5-ylidene system and the 1,2,3-triazol-5-ylidene system. As...
22 KB (2,758 words) - 23:40, 9 December 2023
synthesis of some original persistent carbenes, including bis(diisopropylamino)cyclopropenylidene, the first example of a carbene with all-carbon environment...
20 KB (1,578 words) - 21:22, 29 September 2024
Dihydroimidazol-2-ylidene (category Carbenes)
surprisingly stable, and form an important class of the persistent carbenes. They include the first stable carbenes postulated (but not isolated) by Hans-Werner...
3 KB (215 words) - 00:22, 17 July 2024
nitrogens) would yield the carbene dihydroimidazol-2-ylidene. Derivatives of the latter comprise an important class of persistent carbenes. Classified as a diamine...
4 KB (372 words) - 11:30, 17 February 2024
Retrieved January 7, 2007. A. J. Arduengo (1976). "Looking for Stable Carbenes: The Difficulty in Starting Anew". Accounts of Chemical Research. 32 (11):...
141 KB (4,883 words) - 05:21, 30 October 2024
chemistry at Technische Universität Berlin he is notable for work on persistent carbenes and for proposing the Wanzlick equilibrium between saturated imidazolin-2-ylidenes...
2 KB (154 words) - 21:28, 7 July 2024
strong bases. Unlike with olefins, the ylides traditionally called persistent carbenes instead tend to cleave the central bond, forming two phosphaalkene/phosphinidene...
19 KB (2,163 words) - 23:31, 1 July 2024
of vitamin B1: This was the first evidence for the existence of persistent carbenes. Furoin has been used as a plasticizer. Denis Lorient (1999), New...
2 KB (172 words) - 14:45, 28 October 2022
in hydroboration, organometallic chemistry, chiral materials and persistent carbenes. In 2010 Crudden became head of a Natural Sciences and Engineering...
13 KB (1,138 words) - 04:03, 26 August 2024
Stable phosphorus radicals (redirect from Stable and persistent phosphorus radicals)
Stable and persistent phosphorus radicals are phosphorus-centred radicals that are isolable and can exist for at least short periods of time. Radicals...
43 KB (4,298 words) - 17:13, 18 September 2024
Stannylene (section Persistent stannylene)
(R2Sn:) are a class of organotin(II) compounds that are analogues of carbene. Unlike carbene, which usually has a triplet ground state, stannylenes have a singlet...
13 KB (1,329 words) - 05:06, 8 February 2024
species are usually encountered only as transient intermediates. However, persistent alkyl radicals with half-lives "from seconds to years" have been prepared...
12 KB (1,221 words) - 23:26, 4 August 2024
Grubbs, a CRD consultant, for the metathesis work. Anthony Arduengo’s persistent carbenes opened up a new area of chemistry and they have proven to be important...
30 KB (3,971 words) - 21:54, 23 March 2024
bonds are more non-polar covalent in character. Gallium(III) iodide Persistent carbene Dohmeier, Carsten; Loos, Dagmar; Schnöckel, Hansgeorg (1996). "Aluminum(I)...
34 KB (3,439 words) - 03:33, 22 August 2024
The premier example is difluorocarbene, CF2, which is a singlet whereas carbene (CH2) has a triplet ground state. This difference is significant because...
41 KB (4,534 words) - 14:34, 22 September 2024
a carbene via loss of N2. Insertion generated a BC5 system, which could then undergo a subsequent insertion with another equivalent of the carbene to...
26 KB (2,648 words) - 20:40, 22 July 2024
compounds include both stannylenes (formula: R2Sn, as seen for singlet carbenes) and distannylenes (R4Sn2), which are roughly equivalent to alkenes. Both...
81 KB (8,961 words) - 18:13, 28 October 2024
Vinyl Allyl 1-Propenyl Crotyl Allene Cumulene Aryl Phenyl Benzyl Alkyne Carbene Only carbon, hydrogen, and oxygen (only C, H and O) Only one element, not...
64 KB (6,657 words) - 20:26, 5 October 2024
that unstable phosphasilene can react with DMAP and small N-heterocyclic carbene (NHC) to afford the corresponding stable complexes. In phosphasilenes stabilized...
31 KB (3,350 words) - 18:13, 20 November 2023
these cases, the metallocarbene, such as the dirhodium(II)tetracarboxylate carbene, is stabilized through hyperconjugative metal enolate-type interactions...
65 KB (6,396 words) - 21:04, 1 August 2024
with Richard R. Schrock describing living polymerization with a tungsten carbene complex. Generally, ROMP reactions involve the conversion of a cyclic olefin...
37 KB (4,445 words) - 05:32, 3 June 2024