What is the product of the bromination of cis stilbene?

What is the product of the bromination of cis stilbene?

Bromination of trans-stilbene produces predominantly meso-1,2-dibromo-1,2-diphenylethane (sometimes called meso-stilbene dibromide), in line with a mechanism involving a cyclic bromonium ion intermediate of a typical electrophilic bromine addition reaction; cis-stilbene yields a racemic mixture of the two enantiomers …

Is CIS stilbene planar?

The optimized geometries of trans- and cis-stilbene optimized at CAM-B3LYP/6-31G(d,p) are displayed in Figure 1. As expected, the trans conformer is planar and the cis conformer is twisted to avoid clashes between the phenyl rings….Fluoresence of encapsulated stilbene.

(a) (b)
(c) (d)

Is E or Z stilbene more stable?

Isomers. Stilbene exists as two possible isomers known as (E)-stilbene and (Z)-stilbene. (Z)-Stilbene is sterically hindered and less stable because the steric interactions force the aromatic rings 43° out-of-plane and prevent conjugation.

What is the melting point of 1/2 dibromo 1 2 Diphenylethane?

235°C to 241°C
Specifications

CAS Min % 95.0
Color Undesignated
Melting Point 235°C to 241°C
Assay Percent Range 95% min. (HPLC)
Infrared Spectrum Authentic

What is the melting point of stilbene?

Melting point of 122-124°C. Shows blue fluorescence. (NTP, 1992) Stilbene is an olefinic compound and a member of benzenes. (E)-stilbene

Is cis-stilbene a solid liquid or gas?

Cis-stilbene is an oily yellow liquid. Freezing point 5°C. Insoluble in water. Soluble in ethanol. Unstable relative to the trans isomer, which is a solid with a melting point of 122-124°C.

How would the product of cis-stilbene look like after bromination?

How would the product of cis-stilbene look like after bromination? 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 ).

How can I compare the isomers of stilbene and meso?

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 (1 S, 2 R) and meso (1 R, 2 S) isomers instead. (but ignore the lack of a third arrow in the first step… that part of the image is not correct!)