bromination of cis stilbene

bromination of cis stilbene

Bromination of cis and trans stilbene Organic Chemistry

We did a lab where we used bromination of stilbenes. cisstilbene produced a racemic mixture of 1,2dibromo1,2diphenylethane which appeared white, powdery, clumpy, and dull.

Bromination of Cis and TransStilbene Diagram,,

Instead of bromine, a volatile liquid, pyridinium tribromide will be used. This is a solid which is more convenient to work with. The compounds that will be brominated are cis and transstilbene. The products are 1,2 dibromo1,2diphenylethanes of varying stereochemistry (Ph = phenyl = C6H5).

How would the product of cisstilbene look like after

It would probably look like this: Just as you had started with a molecule with two phenyl substituents on the same side, the product has the configuration on each stereocenter the same as the other (R,R; S,S). If you rotate the central "C""C" bond by about 120^@, you can compare these more closely. Had you started with (E)stilbene instead of (Z)stilbene, you would have gotten meso (1S, 2R

Stilbene lol StuDocu

Bromination of cisstilbene. Note: Slightly less cisstilbene is used in this experiment than transstilbene due to the relative cost of the two isomers. The difference in cost reflects the relative difficulty of synthesizing each isomer.

Answered: In the bromination of stilbene, bartleby

Chemistry Q&A Library In the bromination of stilbene experiment, transstilbene is used. If cisstilbene was used, would the product be an enantiomer or diastereomer of the product obtained with transstilbene. Give a brief explanation why. In the bromination of stilbene experiment, transstilbene is used.

CisStilbene an overview, ScienceDirect Topics

Jaan Laane, in Frontiers of Molecular Spectroscopy, 2009. 5.2 Stilbenes. Both trans and cisstilbene are stable molecules with the conformation of the trans form slightly lower in energy by about 4.6 kcal/mol and with the barrier to internal rotation (isomerization) of 48.3 kcal/mol [74].This precludes any isomerization about the double bond occurring in the ground state, but the trans to cis


Transstilbene was brominated and 5.67g of 1,2dibrmono1,2diphenylethane were obtained. This is a percentage yield of 60.07%. The melting point range of 1,2dibromo1,2diphenylethane was found to be 240.2 o to 241.7 o C.

Bromination of Alkenes ResearchGate

cisstilbene) to perform the bromination reaction on. Each reactant will result in a different configuration similar to the examples above. Fortunately, the resulting melting points (m.p.) are

Stilbene an overview, ScienceDirect Topics

The name for stilbene (1,2diphenylethylene) was derived from the Greek word stilbos, which means shining. They exist in two isomeric forms of 1,2diphenylethylene: (E)stilbene (transstilbene) (167), which is not sterically hindered, and (Z)stilbene (cisstilbene) (168), which is sterically hindered and therefore less stable (Fig. 23).The stilbene feature is associated with intense

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