Cumulene
A cumulene is a hydrocarbon with three or more cumulative (consecutive) double bonds. A member of this compound class is butatriene (which is also called simply cumulene), H2C=C=C=CH2. Unlike most alkanes and alkenes, cumulenes tend to be rigid, which makes them appealing for molecular nanotechnology. Polyynes are another kind of rigid carbon chains. Cumulenes are found in regions of space where hydrogen is rare (see astrochemistry). Inorganic cumulenes include carbon suboxide.

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Cumulene - Wikipedia, the free encyclopedia
A Cumulene is a hydrocarbon with three or more cumulative (consecutive) double bonds. A member of this compound class is butatriene (which is also called ...
en.wikipedia.org/wiki/Cumulene
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Orbital overlap occur in cumulene? - Yahoo Answers
The carbons on the ends are sp² hybridized, with a p-orbital for the 'second' bond in the double bond with their neighboring carbons. They have those ...
answers.yahoo.com/question/?qid=20090424082523AAr5HxB
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Structure of the Cumulene Carbene Butatrienylidene - Harvard ...
Sep 9, 1996 ... the Cumulene carbene series (H2Cn ) observed in the labora- pulse, is introduced into the cavity, producing a macroscopic tory. The first ...
cfa-www.harvard.edu/mmw/mmwlab/websitepdf/42.pdf
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Cumulene - definition of Cumulene by the Free Online Dictionary ...
cu·mu·late (ky m y -l t ). v. cu·mu·lat·ed, cu·mu·lat·ing, cu·mu·lates. v.tr. 1. To gather in a heap; accumulate. 2. To combine into one unit; merge. v.intr. To become ...
www.thefreedictionary.com/Cumulene
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Cumulene - Merriam-Webster Online
a hydrocarbon containing cumulated double bonds. Origin of Cumulene. cumulated + -ene. This word doesn't usually appear in our free dictionary, but the  ...
www.merriam-webster.com/dictionary/cumulene
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Relative stabilities of fullerene, cumulene, and ... - ResearchGate
The relative stabilities of closed fulIerene, Cumulene, and polyacetylene carbon structures, as well as the cohesive energies for clusters of size n = 18, 20, 22, 24,  ...
www.researchgate.net/publication/234855935_Relative_stabilities_of_fullerene_cumulene_and_polyacetylene_structures_for_Cn__n1860/file/72e7e52309a8ccbf07.pdf
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Catalytic and Stoichiometric Cumulene Formation within Dimeric ...
Aug 22, 2013 ... A series of β-diketiminate-supported magnesium and calcium acetylide complexes have been synthesized by σ-bond metathesis of magnesium ...
pubs.acs.org/doi/abs/10.1021/om400678d
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Synthesis and structure of seven-membered cyclic cumulene ...
Synthesis and structure of seven-membered cyclic Cumulene. PDF [210 KB] · PDF w/ Links[0 KB] · First Page · Supporting Info ->. PDF. ja00075a079_si_001. pdf ...
pubs.acs.org/doi/abs/10.1021/ja00075a079
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Thermal cyclotrimerization of tetraphenyl[5]cumulene ...
Tetraphenyl[5]Cumulene (tetraphenylhexapentaene) underwent cyclotrimerization in refluxing toluene for 10–15 min to give a tricyclodecadiene derivative in ...
pubs.rsc.org/en/content/articlelanding/2009/cc/b815620d
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cumulene - Wiktionary
Cumulene (plural Cumulenes). (organic chemistry) Any hydrocarbon (or derivative ) having three or more cumulative double bonds e.g. R2C=C=C=CR2 ...
en.wiktionary.org/wiki/cumulene
Search results for "Cumulene"
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Cumulene in science
Cumulene - Athenaeum Home - University of Georgia
Browsing University of Georgia Theses and Dissertations by Subject "Cumulene". 0-9 · A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W ...
Nearly Degenerate Isomers of C(BH)2: Cumulene, Carbene, or ...
Oct 7, 2013 ... The ground electronic state of C(BH)2 exhibits both a linear minimum and a peculiar angle-deformation isomer with a central B-C-B angle near ...
[PDF]r,ω-Diferrocenyl Cumulene Molecular Wires. Synthesis ...
Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, ... Cumulene chain length the reactivity of Cumulenes increases considerably, ...
Detection and Characterization of the Cumulene ... - ResearchGate
W. Chen and S. E. Novick, Department of Chemistry, Wesleyan University, ... ABSTRACT Two Cumulene carbenes, H2C5 and H2C6, were detected in a ...
Detection and Characterization of the Cumulene Carbenes H2C5 ...
W. Chen and S. E. Novick, Department of Chemistry, Wesleyan University, ... Two Cumulene carbenes, H2C5 and H2C6, were detected in a supersonic ...
Cumulene molecular wire conductance from first principles
Mar 3, 2010 ... 1Division of Materials Theory, Department of Physics, Uppsala University, 75121 Uppsala, Sweden 2Department of Microtechnology and ...
[PDF]Structure of the Cumulene Carbene Butatrienylidene - Harvard ...
Sep 9, 1996 ... the Cumulene carbene series (H2Cn ) observed in the labora- pulse, is introduced into the cavity, producing a macroscopic tory. The first ...
Cumulene molecular wire conductance from first principles
Dec 15, 2010 ... Prasongkit, Jariyanee (Uppsala University, Disciplinary Domain of Science and ... Cumulene molecular wire conductance from first principles.
[PDF]Electrosynthesis of sulfur-containing organic ... - ScienceDirect
“Department of Chemical Science and Technology, The University of Tokushima, ... organic compounds from Cumulene derivatives was studied using a ...
Apponi et al., Laboratory Detection of New Cumulene Carbenes
Laboratory Detection of Four New Cumulene Carbenes: H2C7, H2C8, H2C9, and ... 2 Division of Engineering and Applied Sciences, Harvard University, 29 ...
Books on the term Cumulene
Best Synthetic Methods: Acetylenes, Allenes and Cumulenes: ...
Best Synthetic Methods: Acetylenes, Allenes and Cumulenes: ...
Lambert Brandsma, 2003
Acetylenes, Allenes and Cumulenes Lambert Brandsma. Scale: 0.20 molar; Apparatus: 500-ml three-necked, round-bottomed flask, provided with a dropping funnel, a gas-tight mechanical stirrer and an efficient reflux condenser. A trap is ...
Best Synthetic Methods: Acetylenes, Allenes and Cumulenes
Best Synthetic Methods: Acetylenes, Allenes and Cumulenes
2004
There is a vast and often bewildering array of synthetic methods and reagents available to organic chemists today. The Best Synthetic Methods series allows any scientist who is interested in the chemical transformations of molecules to choose between all the alternatives and assess their real advantages and limitations. With the emphasis on laborat...
Heteroaryl(trifluoromethyl)carbenes and Related Strained ...
Heteroaryl(trifluoromethyl)carbenes and Related Strained ...
Jian Wang, 2007
We have investigated the photochemical behavior of 2-benzofuryl(trifluoromethyl)carbene, 2-benzothienyl(trifluoromethyl)carbene, 2-thienyl(trifluoromethyl)carbene and 2-thienylchlorocarbene by means of matrix isolation techniques.
Best Synthetic Methods: Synthesis Acetylenes, Allenes and Cumulenes
Best Synthetic Methods: Synthesis Acetylenes, Allenes and Cumulenes
2003
There is a vast and often bewildering array of synthetic methods and reagents available to organic chemists today. The Best Synthetic Methods series allows any scientist who is interested in the chemical transformations of molecules to choose between all the alternatives and assess their real advantages and limitations. With the emphasis on laborat...
Cumulenes in Click Reactions
Cumulenes in Click Reactions
Henri Ulrich, 2009
Many examples of carbon Cumulenes participating as dienes, dienophiles, or both, are known. Even aryl substituted Cumulenes sometimes react as dienes in [ 4+2] cycloaddition reactions. A 1,4-dipolar cycloaddition reaction also affords ...
Cumulenes in Click Reactions
Cumulenes in Click Reactions
Henri Ulrich, 2009
Cumulenes are organic molecules with two or more cumulative (consecutive) double bonds. Their reactions often proceed at room temperature, with or without a catalyst, and are stereospecific, giving the reaction products in high yields – features characteristic of “click reactions”. Cumulenes in Click Reactions presents a comprehensive list of cumul...
Carbyne and Carbynoid Structures
Carbyne and Carbynoid Structures
R.B. Heimann, S.E. Evsyukov, Ladislav Kavan, 1999
It was found that (i) the polyyne structure is (slightly) more stable than the Cumulene structure for straight chain segments, (ii) the average total energy, Eav of a Cumulene chain with defects (kinks) is higher than for the corresponding polyyne ...
Organic Reactions and Orbital Symmetry
Organic Reactions and Orbital Symmetry
T. L. Gilchrist, R. C. Storr, 1979
They can therefore be considered as the prototypes for concerted Cumulene additions; the vacant p orbital plays the same role as the 7r* orbital of the Cumulene.25 In addition to the stabilisation discussed above, since vinyl cations have an ...
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Blog posts on the term
Cumulene
Phys. Rev. B 81, 115404 (2010): Cumulene molecular wire conductance from first principles
prb.aps.org/abstract/PRB/v81/i11/e115404
Carbyne Predicted To Be Strongest Known Material | Chemical & Engineering News
cen.acs.org/articles/91/web/2013/10/Carbyne-Predicted-Strongest-Known-Material.html
Computational Study on the Intramolecular Carbene-CO Coupling in M(CH2)(CO)3 Radicals (M = Co, Rh, Ir)
Journal of Inorganic Chemistry is a peer-reviewed, open access journal that publishes original research articles as well as review articles related to all aspects of inorganic chemistry.
www.hindawi.com/journals/jic/2013/149425/
Stronger than carbon nanotubes: Polyynes and the prospects for carbyne — Metamodern
Polyyne rod, 44 carbon atoms + end caps Carbon nanotubes have a reputation for being strongest possible fibers, but polyyne chains are stronger, as measured by the critical strength/density ratio: Polyyne carbon-carbon bonds are stronger than the bonds in graphene
metamodern.com/2010/09/29/stronger-than-carbon-nanotubes-polyynes-and-carbyne/
NMSTR--Nano-Micro Science & Technology Research Society » Carbon atomic chains possess extreme physical properties
By Ragnar Zhang on April 4, 2012 in Materials, News | 1 Comment.
nmstr.org/2012/04/04/carbon-atomic-chains-possess-extreme-physics-properties/
cond-mat.mtrl-sci - Materials Science: 1204.5359 (Jariyanee Prasongkit et al.)
Conductance of linear carbon wires bridging carbon nanotubes [PDF]Jariyanee Prasongkit, Anton Grigoriev, Rajeev AhujaA carbon wire: Cumulene or polyyne, bridging two-dimensional electrodes provides a model for interconnecting molecular electronics circuit with one of the well-known conductive molecular wires. In the recent experiment, the appearance of carbon wire bridging graphene sheets was observed [PRL 102, 205501 (2009)], thus demonstrating a mechanical way of producing the Cumulene.
cpr-condmat-mtrlsci.blogspot.com/2012/04/12045359-jariyanee-prasongkit-et-al.html
College Submissions: What types of orbital overlap occur in cumulene?
What types of orbital overlap occur in Cumulene? Check all that apply.  overlap overlap overlap overlap overlap overlap overlapCorrect.
csubs.blogspot.com/2012/04/what-types-of-orbital-overlap-occur-in.html
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