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Topic: Propyne

Related Topics

Methylacetylene

MAPP gas

Chemical formula

Carbon

	Grommet - Research Produced
		Propyne pyrolysis was experimentally studied in a flow reactor at 1208 K and 1 atm.
		At these conditions, the decomposition of propyne was found to be highly sensitive to the initiation reactions, namely, propyne-to-allene isomerization and propyne CH fission.
		These include the mutual isomerization of propyne and allene, the chemically activated reactions of propyne and allene with the H atom and of acetylene with methyl on the C
	www.udel.edu /chem/grommet/research.html (542 words)

	Bristol
		The other, which yields a slower distribution of H(D) atoms, is presumed to arise as a result of radiationless transfer to a lower electronic state, isomerisation and subsequent unimolecular decay.
		The TOF and TKER spectra of the H atoms resulting from 121.6 nm photolysis of allene are found to be indistinguishable from those associated with this second, ‘statistical’ fragmentation channel in propyne.
		Propyne and allene photolysis at 193.3 nm and at 121.6 nm.
	www.chem.leeds.ac.uk /PICNIC/members/bristol2.htm (763 words)

	how is this drawn?
		Propyne is a three carbon (prop-) alkyne (-yne; there's a triple bond between two carbons):
		The nucleophile is the carbon in the "silver of propyne" that is adjacent to the silver atom.
		This SN2 (SN1?) reaction will end up with the "silver of propyne" being attached to the bromide, except that the silver and the bromine atoms will be lost from the molecule.
	www.chemicool.com /forum/ptopic29.html (635 words)

	thomast
		Comparing the observed vibrational structure with that predicted theoretically makes it possible to assign the three peaks to the chemically inequivalent carbon atoms in propyne: the peak to the left arises from ionization of the HC≡ carbon and that to the right from ionization of the CH carbon.
		It is clear that this procedure provides an excellent description of the experimentally observed spectrum and that with this we can obtain accurate ionization energies for the inequivalent carbon atoms, even in a rather complex spectrum.
		Chemical insights from high-resolution x-ray photoelectron spectroscopy and ab initio theory: Propyne, trifluoropropyne, and ethynylsulfur pentafluoride, L.
	www.chem.orst.edu /personalhomepages/thomast.html (808 words)

	Glen Research Glen Report
		Substitution of methyl with 1-propyne at the C-5 position of pyrimidines allowed better stacking of the bases since the propyne group is planar with respect to the heterocyclic base.
		However, the results were indeed dramatic in that the C-5 propyne substituted phosphorothioate ODN inhibited gene expression at the very low concentration of 0.05 µM. The modified phosphorothioate was 50X more effective than the corresponding phosphodiester ODN, presumably as a result of increased nuclease resistance.
		We also see applications for the C-5 propyne derivatives in PCR experiments, especially where the target is purine rich.
	www.glenres.com /GlenReports/GR6-21.html (816 words)

	Methylacetylene - Wikipedia, the free encyclopedia
		It is a component of MAPP gas, which is commonly used in gas welding.
		Research by European space concerns into using light hydrocarbons with liquid oxygen as a relatively high performing propellant combination which would also be less toxic than the commonly used MMH/NTO (monomethylhydrazine/nitrogen tetroxide) systems, showed that propyne would be highly advantageous for craft intended for low Earth orbital operations.
		This conclusion was reached based upon a specific impulse expected to reach 370s if oxygen is used as oxidiser, a high density, and energy/volume ratio, and the moderate boiling point, which causes the chemical to present fewer problems in storage than for example a fuel that needs to be kept at extremely low temperatures.
	en.wikipedia.org /wiki/Methylacetylene (166 words)

	The solution structure of a DNA{middle dot}RNA duplex containing 5-propynyl U and C; comparison with 5-Me modifications ...
		The bulkier propyne modification further decreases the electrophoretic
		groove is partly filled by the bulky propyne groups (yellow).
		as the propyne groups form a stack along the major groove.
	nar.oxfordjournals.org /cgi/content/full/31/10/2683 (5304 words)

	Antisense gene inhibition by oligonucleotides containing C-5 propyne pyrimidines -- Wagner et al. 260 (5113): 1510 -- ... (Site not responding. Last check: 2007-10-11)
		Phosphorothioate oligodeoxynucleotides containing the C-5 propyne analogs of uridine and cytidine bind RNA with high affinity and are potent antisense inhibitors of gene expression.
		In a cellular assay, gene-specific antisense inhibition occurred at nanomolar concentrations of oligonucleotide, was dose-dependent and exquisitely sensitive to sequence mismatches, and was correlated with the melting temperature and length of oligonucleotide.
		The high binding affinity of phosphorothioate-modified oligomers for Ff gene 5 protein is moderated by the addition of C-5 propyne or 2'-O-methyl modifications.
	www.sciencemag.org /cgi/content/abstract/260/5113/1510 (1077 words)

	Unimolecular Dissociation in Allene and Propyne: The Effect of Isomerization on the Low-Pressure Rate
		The LS experiments cover 1800-2500 K and 70-650 Torr, in 1, 2, and 4% propyne/Kr and 1 and 2% allene/Kr, whereas the TOF results extend from 1770 and 2081 K in 3% allene or propyne in Ne.
		Rate constants for the CH fission of both allene and propyne were obtained by the usual model-assisted extrapolation of LS profiles to zero time using an extensive mechanism constructed to be consistent with both the time variation of LS gradients and the TOF product profiles.
		This again demonstrates the importance of accessible isomerization and consequent hindered internal rotation on the rate of dissociation of unsaturated species.
	pubs.acs.org /cgi-bin/abstract.cgi/jpcafh/1997/101/i22/abs/jp963314a.html (464 words)

	thomast
		Recent work has taken advantage of the high‑resolution capability of synchrotron radiation to measure the carbon 1s ionization energies for hydrocarbons, where high-resolution makes it possible to resolve details that were previously inaccessible.
		Comparing the observed vibrational structure with that predicted theoretically makes it possible to assign the three peaks to the chemically inequivalent carbon atoms in propyne: the peak to the left arises from ionization of the HC≡ carbon and that to the right from ionization of the CH
		In this figure, the green curve shows the spectrum of propyne that was previously available – the improvement in quality with the new facilities is striking.
	www.chem.orst.edu /personalhomepages/thomast.htm (630 words)

	e-oligos: Antisense Oligonucleotides
		Modification of the phosphodiester bond by replacing one of the non-bridging oxygen by sulfur imparts resistance to nuclease degradation, but in general hybridize to the target sequences with lesser affinity than the phosphodiester counter part.
		The sulfur substituted oligonucleotides have a phosphorothiote linkage and are termed as phosphorothioates or simply as S-oligo.
		Recently it has been shown that C-5 propyne analogs of dC and dT when substituted in phosphorothioate oligonucleotide imparts greater inhibition of gene expression due to increased binding affinity to the target mRNA and increased stability (5).
	www.e-oligos.com /eoweb/products/eo-soligo.asp (469 words)

	IUPAC-NIST Solubility Database, Version 1.0 (Site not responding. Last check: 2007-10-11)
		Argon with Krypton, Xenon, Carbon dioxide, Nitrous oxide, Methane and Poly(trimethylsilyl propyne) (PTMSP)
		Argon with Nitrogen, Carbon dioxide, Methane, Ethane and Poly(trimethylsilyl propyne) (PTMSP)
		Xenon with Carbon dioxide and Poly(trimethylsilyl propyne) (PTMSP)
	srdata.nist.gov /solubility/sol_sys.asp?nm_dataSeries=DS17 (944 words)

	Eurogentec - Modifications - C5-propyne and methyl analogs of dC and dT
		Substitution of methyl with 1-propyne at the C5 position of pyrimidines allowed better stacking of the bases since the propyne group is planar with respect to the heterocyclic base.
		At the same time, propyne is more hydrophobic than methyl and this property contributed to a further increase in binding.
		The improved lipophilicity of the propyne group may also improve transport through cell walls.
	www.eurogentec.com /code/EN/page_02.asp?Page=63 (262 words)

	[22.05] Cassini-CIRS Observations of Ethylene and Propyne in the Southern Hemisphere of Titan (Site not responding. Last check: 2007-10-11)
		[22.05] Cassini-CIRS Observations of Ethylene and Propyne in the Southern Hemisphere of Titan
		Both of these species are destroyed by UV sunlight and ethylene is a source for propyne via the CH + C
		Observations were binned into 10 degree wide latitude bins, spaced 5 degrees apart, and ranging from 80 S to 5 S. The emission angle ranged from 30 to 60 degrees.
	www.aas.org /publications/baas/v36n4/dps2004/298.htm (218 words)

	[No title]
		Comparative theoretical study of the structure and bonding of propyne on the Pt(111) and Pd(111) surfaces
		Theoretical Interpretation of the IR Spectrum of Propyne on Cu(111)
		Structure and bonding of propyne on Cu(111) from density functional and periodic calculations.
	www.quimica.urv.es /~ricart/publications.html (1883 words)

	The high binding affinity of phosphorothioate-modified oligomers for Ff gene 5 protein is moderated by the addition of ...
		The high binding affinity of phosphorothioate-modified oligomers for Ff gene 5 protein is moderated by the addition of C-5 propyne or 2'-O-methyl modifications -- Mou and Gray 30 (3): 749 -- Nucleic Acids Research
		of the propyne modification on protein binding might be enthalpic
		of the propyne modification to the greater thermal stability
	nar.oxfordjournals.org /cgi/content/full/30/3/749 (5326 words)

	Recent Publications by NIST Authors (Site not responding. Last check: 2007-10-11)
		The only products under all conditions are propyne and allene.
		The propyne to allene ratios are 1.8 and 1.6 for the brominated and chlorinated compounds respectively with minimal temperature dependence.
		Results are compared with those for the alkyl compounds and ab-initio calculations on 2-chloropropene.
	ois.nist.gov /nistpubs/technipubs/recent/search.cfm?dbibid=12796 (166 words)

	Self-shifting of some rotational transitions of OCS and CH3CCH (propyne). A survey of measurements on shifting of ...
		Self-shifting of some rotational transitions of OCS and CH CCH (propyne).
		Compares the experimental values for shifts of some rotational transitions of OCS and CH CCH (propyne) measured by Luijendijk (1977) with the calculated values obtained from the Anderson-Tsao-Curnutti-Frost theory and the modified Murphy-Boggs theory as formulated by Cattani.
		The authors review the broadening and shifting of the J=0 to 1 transitions of the methylhalogenides CH Cl, CH Br and CH In particular, they conclude that the theories mentioned predict the right temperature dependence of the shift parameters for these transitions in the temperature region investigated (150-350K).
	stacks.iop.org /0022-3700/14/2813 (293 words)

	Antisense Oligonucleotides
		Substitution of all diester linkage is recommended to provide greater nuclease resistance.
		Recently it has been shown that C-5 propyne analogs of dC and dT when substituted in phosphorothioate oligonucleotide imparts greater inhibition of gene expression due to increased binding affinity to the target
		Wagner, R.W., Matteucci, M.D., Lewis, J.G., Gutierrez, A.J., Moulds, C. and Froehler, B.C. (1993) Antisense gene inhibition by oligonucleotides containing C-5 propyne pyrimidines.
	www.genelink.com /technical/soligo.html (458 words)

	Inhibition of human immunodeficiency virus type-1 env expression by C-5 propyne oligonucleotides specific for ...
		Inhibition of human immunodeficiency virus type-1 env expression by C-5 propyne oligonucleotides specific for Rev-response element stem-loop V. Important note: Information in this article was accurate in 1994.
		The state of the art may have changed since the publication date.
		Inhibition of human immunodeficiency virus type-1 env expression by C-5 propyne oligonucleotides specific for Rev-response element stem-loop V. Biochemistry.
	www.aegis.com /aidsline/1994/oct/M94A0452.html (531 words)

	PS (Propyne Sulfonic Acid Sodium Salt) (Wuhan Jadechem Chemicals Co., Ltd.,China (Mainland))
		PS (Propyne Sulfonic Acid Sodium Salt) (Wuhan Jadechem Chemicals Co., Ltd.,China (Mainland))
		See the most recent posting for this PS (Propyne Sulfonic Acid Sodium Salt) (Dec 14, 2006)
		See more chemical products, fine chemicals, chemical additives products from this supplier.
	jadechem.en.alibaba.com /product/0/50644783/PS__Propyne_Sulfonic_Acid_Sodium_Salt_.html (221 words)

	Electron-C hydrocarbons scattering
		isomers (allene and propyne) and from propane (C
		are dominated by prominent structures: a resonant-like enhancement of the cross section for allene peaks at around 2.3 and 3.4 eV for propyne, while very broad enhancement is centred at 9.5–10 and 8.0–8.5 eV for allene and propyne respectively.
		In addition, the TCS for propyne has been compared with cross sections for other open-chain hydrocarbons with three carbon atoms, i.e.
	stacks.iop.org /0953-4075/35/3781 (316 words)

	Orgo 3D Web : Chapter 3 : Propyne (Site not responding. Last check: 2007-10-11)
		Orgo 3D Web : Chapter 3 : Propyne
		Substituting a methyl group for one of the hydrogens in acetylene gives propyne.
		Why is the carbon-carbon single bond much shorter than the carbon-carbon bond in ethane or propane?
	www.wwnorton.com /orgo3dweb/ch3/11_propyne.htm (79 words)

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