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Type of carbene demonstrating particular stability
A persistent carbene (also known as stable carbene) is an organic molecule whose natural resonance structure has a carbon atom with incomplete octet (a
Persistent_carbene
Organic molecule containing a neutral carbon with two unbound valence electrons
exception are the persistent carbenes, which have extensive application in modern organometallic chemistry. There are two common methods for carbene generation:
Carbene
Class of organometalic compounds
transition metal carbene complex is an organometallic compound featuring a divalent carbon ligand, itself also called a carbene. Carbene complexes have
Transition metal carbene complex
Transition_metal_carbene_complex
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
Coinage metal N-heterocyclic carbene complexes
Coinage_metal_N-heterocyclic_carbene_complexes
Atom, molecule, or ion that has an unpaired valence electron; typically highly reactive
Carbenes in their triplet state can be viewed as diradicals centred on the same atom, while these are usually highly reactive persistent carbenes are
Radical_(chemistry)
Class of organometallic complexes
Cyclic iron tetra N-heterocyclic carbenes are a family of organometallic complexes that are unique in their steric and electronic tunability. This is because
Cyclic iron tetra N-heterocyclic carbenes
Cyclic_iron_tetra_N-heterocyclic_carbenes
American chemist
synthesis of some original persistent carbenes, including bis(diisopropylamino)cyclopropenylidene, the first example of a carbene with all-carbon environment
Guy_Bertrand_(chemist)
Reaction in organic chemistr
with a carbene precursor. An early pioneer was Christoph Grundmann reporting on a carbene dimerisation in 1938. In the domain of persistent carbenes the
Carbene_dimerization
stable digermyne was prepared using DIPP-based terphenyl ligands. Persistent carbenes containing 2,6-diisopropylphenyl substituents are sterically demanding
2,6-Diisopropylphenyl_group
German chemist (1917–1988)
chemistry at Technische Universität Berlin he is notable for work on persistent carbenes and for proposing the Wanzlick equilibrium between saturated imidazolin-2-ylidenes
Hans-Werner_Wanzlick
Class of chemical compounds
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
Triazol-5-ylidene
Retrieved January 7, 2007. A. J. Arduengo (1976). "Looking for Stable Carbenes: The Difficulty in Starting Anew". Accounts of Chemical Research. 32 (11):
List_of_people_from_Florida
Chemical compound
nitrogens) would yield the carbene dihydroimidazol-2-ylidene. Derivatives of the latter comprise an important class of persistent carbenes. Classified as a diamine
Imidazolidine
Chemical compound
surprisingly stable, and form an important class of the persistent carbenes. They include the first stable carbenes postulated (but not isolated) by Hans-Werner
Dihydroimidazol-2-ylidene
Chemical compound
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
Furoin
Family of chemical compounds
Stable and persistent phosphorus radicals are phosphorus-centred radicals that are isolable and can exist for at least short periods of time. The common
Stable_phosphorus_radicals
Topics referred to by the same term
New Haven County, a county in Connecticut, US N-Heterocyclic carbene, a persistent carbene, commonly used as ligand in organometallic chemistry Nag Hammadi
NHC
Family of chemical compounds
Cyclic(alkyl)(amino) carbenes (CAACs) are a class of stable singlet carbene ligands that feature one amino and one sp3 alkyl group adjacent to the carbene carbon atom
Cyclic_alkyl_amino_carbenes
Radicals centered on boron atoms
characteristics of the carbene. The stability of the radicals has been successfully engineered to achieve kinetic persistency and thermodynamic stability
Boryl_radicals
Class of carbon compounds
atom stabilized by two neutral carbene donors, most commonly N-heterocyclic carbenes (NHCs) or cyclic (alkyl)(amino)carbenes (CAACs). As such, they may be
Carbodicarbenes
Canadian chemist
applications in biology and medicine. Crudden's research interests lie in persistent carbenes, materials chemistry, hydroboration, organometallic chemistry, and
Cathleen_Crudden
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
DuPont_Central_Research
Chemical compound
bonds are more non-polar covalent in character. Gallium(III) iodide Persistent carbene Dohmeier, Carsten; Loos, Dagmar; Schnöckel, Hansgeorg (1996). "Aluminum(I)
Gallium_monoiodide
Class of organotin(II) compounds
(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
Stannylene
Study of compounds containing a boron-carbon bond
exchange: As shown, the product is isoelectronic to an N-heterocyclic carbene. Related ligands are borylenes (M–B(R)–M). Alkylideneboranes (RB=CRR) with
Organoboron_chemistry
Chemical element with atomic number 50 (Sn)
compounds include both stannylenes (formula: R2Sn, as seen for singlet carbenes) and distannylenes (R4Sn2), which are roughly equivalent to alkenes. Both
Tin
Study of chemical compounds containing fluorine-carbon bonds
The premier example is difluorocarbene, CF2, which is a singlet whereas carbene (CH2) has a triplet ground state. This difference is significant because
Organofluorine_chemistry
Chemical group derived from alkanes (one hydrogen removed)
species are usually encountered only as transient intermediates. However, persistent alkyl radicals with half-lives "from seconds to years" have been prepared
Alkyl_group
Class of chemical compounds
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
9-Borafluorene
Class of aluminium compounds
synthesize dialumenes, incorporating strong σ-donors such as N-heterocyclic carbenes (NHCs) to stabilize the bonding structure. Their weak π-bonding in comparison
Dialumene
Chemical element with atomic number 33 (As)
Wang Y, Xie Y, Wei P, Shaefer III HF, Schleyer Pv, Robinson GH (2010). "Carbene Stabilization of Diarsenic: From Hypervalency to Allotropy". Chemistry:
Arsenic
Chemical radical
oxidation of a carbene-coordinated pnictogen complex to obtain Bi(II) radical species was reported by Stephan Schulz and coworkers in 2022. The carbene-coordinated
Organobismuth_radical
Chemical element with atomic number 30 (Zn)
Soleilhavoup, Michèle; Bertrand, Guy (2015). "Cyclic (Alkyl)(Amino)Carbenes (CAACs): Stable Carbenes on the Rise". Acc. Chem. Res. 48 (2): 256–266. doi:10.1021/ar5003494
Zinc
Chemical radical
"(L)2C2P2: Dicarbondiphosphide Stabilized by N-Heterocyclic Carbenes or Cyclic Diamido Carbenes". Angewandte Chemie International Edition. 56 (21): 5744–5749
Diradicaloid
Hypothetical charge of an atom if all its bonds to different atoms were fully ionic
Soleilhavoup, Michèle; Bertrand, Guy (2015). "Cyclic (Alkyl)(Amino)Carbenes (CAACs): Stable Carbenes on the Rise". Acc. Chem. Res. 48 (2): 256–266. doi:10.1021/ar5003494
Oxidation_state
Class of organic compounds
Vinyl Allyl 1-Propenyl Crotyl Allene Cumulene Aryl Phenyl Benzyl Alkyne Carbene Only carbon, hydrogen, and oxygen (only C, H and O) R-O-R Acetal Alcohol
Chlorofluorocarbon
Branch of organic chemistry
pyramidal. Monomeric compounds with the formula SnR2, tin analogues of carbenes CR2 are also known in a few cases. One example is Sn(SiR3)2, where R is
Organotin_chemistry
Chain-growth polymerization without the ability to terminate
with Richard R. Schrock describing living polymerization with a tungsten carbene complex. Generally, ROMP reactions involve the conversion of a cyclic olefin
Living_polymerization
Pericyclic chemical reaction
these cases, the metallocarbene, such as the dirhodium(II)tetracarboxylate carbene, is stabilized through hyperconjugative metal enolate-type interactions
1,3-Dipolar_cycloaddition
that unstable phosphasilene can react with DMAP and small N-heterocyclic carbene (NHC) to afford the corresponding stable complexes. In phosphasilenes stabilized
Phosphasilene
PERSISTENT CARBENE
PERSISTENT CARBENE
Female
Bulgarian
, persistent, resolute.
Boy/Male
Arabic, Muslim
To Attack Violently and Persistently
Girl/Female
Muslim
Assiduous, Persistent
Surname or Lastname
Jewish (Ashkenazic)
Jewish (Ashkenazic) : ornamental name from modern German Gold, Yiddish gold ‘gold’. In North America it is often a reduced form of one of the many compound ornamental names of which Gold is the first element.English and German : from Old English, Old High German gold ‘gold’, applied as a metonymic occupational name for someone who worked in gold, i.e. a refiner, jeweler, or gilder, or as a nickname for someone who either had many gold possessions or bright yellow hair.English : from an Old English personal name Golda (or the feminine Golde), which persisted into the Middle Ages as a personal name. The name was in part a byname from gold ‘gold’, and in part a short form of the various compound names with this first element.
Surname or Lastname
English (Devon)
English (Devon) : from Middle English hauek ‘hawk’, applied as a metonymic occupational name for a hawker (see Hawker), a name denoting a tenant who held land in return for providing hawks for his lord, or a nickname for someone supposedly resembling a hawk. There was an Old English personal name (originally a byname) H(e)afoc ‘hawk’, which persisted into the early Middle English period as a personal name and may therefore also be a source.English (Devon) : topographic name for someone who lived in an isolated nook, from Middle English halke (derived from Old English halh + the diminutive suffix -oc), or a habitational name from some minor place named with this word, such as Halke in Sheldwich, Kent.
Girl/Female
Arabic, Muslim
Assiduous; Persistent; Devoted
Boy/Male
Hindu, Indian, Kannada, Marathi, Sanskrit, Telugu
Never Ending; Persistence; Continuity; Perpetuity; Eternity; Uninterrupted Duration; Diligence; Conscientiousness; Truthful; Straightforward; Honest
Girl/Female
Indian
Assiduous, Persistent
Surname or Lastname
German and Dutch
German and Dutch : from Middle High German bloch, Middle Dutch blok ‘block of wood’, ‘stocks’. The surname probably originated as a nickname for a large, lumpish man, or perhaps as a nickname for a persistent lawbreaker who found himself often in the stocks.English : possibly a metonymic occupational name for someone who blocks, as in shoemaking and bookbinding, from Middle English blok ‘block’.Jewish (Ashkenazic) : Americanized spelling of Bloch (see Vlach).Adriaen Coertsz Block was a Dutch-born merchant-explorer who traded along the CT coast and Long Island shortly after Hudson’s voyage to the region in 1609. Block Island, between the north fork of Long Island and RI, which he used as a base of operations, is named after him.
Surname or Lastname
English
English : from an Old English personal name or byname Tutta, preserved in place names such as Tutnall (Worcestershire) and Tuttington (Norfolk), and apparently persisting into the Middle Ages. Its origin and meaning are unclear.German (also Tütt) : from a short form of a Germanic personal name formed with Diet- (see Dietrich), or from a short form of Dudo, originally a name from nursery talk.
Surname or Lastname
English
English : from northern Middle English gad ‘goad’, ‘spike’, ‘sting’ (Old Norse gaddr), hence a metonymic occupational name for a cattle driver or, more likely, a nickname for a persistent and irritating person. The Old Norse word is attested as a byname (see Gadsby).
Male
African
obstinate, persistent.
PERSISTENT CARBENE
PERSISTENT CARBENE
Girl/Female
Hindu, Indian
Always Fortunate; Prosperous
Girl/Female
Indian
Beautiful, A musical Raag
Girl/Female
Tamil
Mild, Goddess Durga
Boy/Male
Tamil
Bidyut | பீதயà¯à®‚த
Lightning, Electricity
Boy/Male
Tamil
Fame of Lord
Girl/Female
Tamil
A creeper with flowers
Girl/Female
Indian, Malay, Portuguese, Sikh
Pure
Boy/Male
Hebrew
The Lord has remembered.
Boy/Male
Anglo Saxon
Bold in war.
Boy/Male
Arabic, Muslim
Mercury; Silver
PERSISTENT CARBENE
PERSISTENT CARBENE
PERSISTENT CARBENE
PERSISTENT CARBENE
PERSISTENT CARBENE
a.
Sullenly obstinate; obstinately determined or persistent; as, dogged resolution; dogged work.
n.
Visual persistence, or persistence of the visual impression; auditory persistence, etc.
a.
Performed with constant diligence or attention; unremitting; persistent; as, assiduous labor.
a.
Characterized by perseverance; persistent.
a.
See Persistent.
n.
Alt. of Persistency
a.
Persistently opposed.
a.
Insisting; persistent; persevering.
n.
The persistence of motion.
n.
Indefatigable quality; unweariedness; persistency.
n.
The act of soliciting; earnest request; persistent asking; importunity.
v. t.
To hold or maintain persistently.
adv.
In a persistent manner.
a.
Persistent.
a.
Remaining beyond the period when parts of the same kind sometimes fall off or are absorbed; permanent; as, persistent teeth or gills; a persistent calyx; -- opposed to deciduous, and caducous.
v. t.
To harass with importunity; to pursue with persistent solicitations; to annoy.
n.
The quality or state of being persistent; staying or continuing quality; hence, in an unfavorable sense, doggedness; obstinacy.
a.
Inclined to persist; tenacious of purpose; persistent.
v. t.
Figuratively, to draw out or obtain, as secrets or money, by persistent questioning or plying; to question or ply persistently in order to elicit something, as information, money, etc.
a.
Inclined to persist; having staying qualities; tenacious of position or purpose.