Detail of "540-49-8"

CAS Number:
540-49-8
Name:
Ethene, 1,2-dibromo-
Molecular Structure:
Formula:
C2H2 Br2
Molecular Weight:
185.86
Synonyms:
Ethylene,1,2-dibromo- (6CI,8CI); 1,2-Dibromoethene; 1,2-Dibromoethylene; 2-Bromovinylbromide; Acetylene dibromide; NSC 8744; sym-Dibromoethylene
EINECS:
208-747-6
Density:
2.27 g/mL at 20 °C(lit.)
Boiling Point:
108 °C at 760 mmHg
Flash Point:
°C
Appearance:
Colorless to Yellow Liquid
Hazard Symbols:
T
Risk Codes:
25-36/37/38
Safety:
26-36/37/39-45 Details
Transport Information:
UN 2810 6

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Shock tube studies of some bromohydrocarbons: Shock tube studies of some bromohydrocarbons. Lippiatt, J. H.; Wells, D.In this study， 540-49-8 and 106-93-4 are also used. E. (Univ. Salford, Salford, Engl.). Dyn. Mass Spectrom., 4, 273-84 (English) 1976. CODEN: DYMSAB. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) Gas phase pyrolysis of EtBr, CH2:CHBr, BrCH:CHBr, and (CH2Br)2 in a shock tube was followed by time-of-flight spectrometric anal. of the reaction mixt. EtBr and CH2:CHBr decomposed by a 4-center mol. elimination of HBr, with activation energies of 130 and 160 kJ mole-1, resp.; the introduction of a .beta.-bromine atom to each compd. reduced the resp. activation energies for HBr elimination to 84 and 124 kJ mole-1, which promoted free radical reactions for these compds., initiated by a C-Br fission in (CH2Br)2. .

First total synthesis of the brominated polyacetylenes (+)-diplyne A and D: proof of absolute configuration: First total synthesis of the brominated polyacetylenes (+)-diplyne A and D: proof of absolute configuration. Gung, Benjamin W.; Gibeau, Craig; Jones, Amanda (Department of Chemistry and Biochemistry, Miami University, Oxford, OH 45056, USA). Tetrahedron: Asymmetry, 15(24), 3973-3977 (English) 2004 Elsevier B.V. CODEN: TASYE3. ISSN: 0957-4166. DOCUMENT TYPE: Journal CA Section: 26 (Biomolecules and Their Synthetic Analogs) The first total syntheses of the enantiomers of two novel brominated polyacetylenic natural products, diplynes A (I) and D (II) , are reported. 827622-21-9 and 540-49-8 which are cas registry numbers of chemicals are mentioned. The syntheses are based on Pd and Cu(I)-catalyzed coupling reactions. The stereocenter was derived from D-mannitol. The stereocenter in the naturally occurring (-)-diplyne A was established to have an (R)-configuration. .