- 2019-11-04: Released v39.0.0. 2019-11-02: Starting with the next release, v39.0.0, I will no longer provide binaries for openSUSE in general and for 32-bit versions of Fedora anymore. For openSUSE current binaries are always available from the Open Build System within a couple of hours from release.
- Download Properties Editor Project for free. It is released from the troublesomeness of the Unicode conversion by native2ascii. This editor can edit directly the property file written in the Unicode reference character, and saves the time and effort changed into Unicode by native2ascii.
ProP 1.0 is available as a stand-alone software package, with the same functionality as the service above. Ready-to-ship packages exist for the most common UNIX platforms. Djay fx pro 2 1 1. There is a download page for academic users; other users are requested to contact CBS Software Package Manager at [email protected].
Names | |
---|---|
Preferred IUPAC name | |
Other names Allene[1] Propadiene | |
Identifiers | |
| |
1730774 | |
ChEBI |
|
ChEMBL | |
ChemSpider |
|
ECHA InfoCard | |
EC Number | |
860 | |
MeSH | Propadiene |
UNII | |
UN number | 2200 |
CompTox Dashboard(EPA) | |
| |
| |
Properties | |
C3H4 | |
Molar mass | 40.065 g·mol−1 |
Appearance | Colorless gas |
Melting point | −136 °C (−213 °F; 137 K) |
Boiling point | −34 °C (−29 °F; 239 K) |
log P | 1.45 |
Hazards | |
Safety data sheet | External MSDS |
F+ | |
R-phrases(outdated) | R12 |
S-phrases(outdated) | S9, S16, S33 |
NFPA 704 (fire diamond) | |
Explosive limits | 13% |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
verify (what is ?) | |
Infobox references |
Propadiene or allene is the organic compound with the formula H2C=C=CH2. It is the simplest allene i.e. a compound with two adjacent carbon double bonds.[2] As a constituent of MAPP gas, it has been used as a fuel for specialized welding.
Production and equilibrium with methylacetylene[edit]
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Allene exists in equilibrium with methylacetylene (propyne) and the mixture is sometimes called MAPD for methylacetylene-propadiene:
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- H3CC≡CH H2C=C=CH2
Black ops 1 computer codes zombie maps. for which Keq How to fix warning could not start excel server for export in a mac. = 0.22 at 270 °C or 0.1 at 5 °C.
MAPD is produced as a side product, often an undesirable one, of dehydrogenation of propane to produce propene, an important feedstock in the chemical industry. MAPD interferes with the catalyticpolymerization of propene.[3]
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References[edit]
- ^ abNomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 375. doi:10.1039/9781849733069-FP001. ISBN978-0-85404-182-4.
The name allene, for CH2=C=CH2, is retained for general nomenclature only; substitution is allowed, but not by alkyl or any other group that extends the carbon chain, nor characteristic groups expressed by suffixes. The systematic name, propa-1,2-diene, is the preferred IUPAC name.
- ^IUPAC, Compendium of Chemical Terminology, 2nd ed. (the 'Gold Book') (1997). Online corrected version: (2006–) 'allenes'. doi:10.1351/goldbook.A00238
- ^Klaus Buckl, Andreas Meiswinkel 'Propyne' in Ullmann's Encyclopedia of Industrial Chemistry, 2008, Wiley-VCH, Weinheim. doi:10.1002/14356007.m22_m01
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