Alkene

Bromination of E-Stilbene Kelly Marroquin Fall 2017 Lab Section: 353-01 Lab Partner: Seon Lee  Abstract: The bromination of the alkane was calculated and the overall percent yield was 96.35% with the percent yield with the calculated theoretical yield was 79.85%. The addition reaction was synthesized with a mechanism using 3 steps. The E-Stilbene reacted with pyridinium hydromide perbromide to form the pure (1R, 2S)-stilbene dibromide. One of the two diastereomeric products, the other would be

cis-trans isomers) are molecules with a double bond that form cis and trans isomers. Square planar molecules can also display geometric isomerism. Cis and trans refer to the orientation of functional groups within a molecule and mostly occur in alkenes. In alkenes, C=C bonds have restricted rotation so the groups on either end of the bond are ‘frozen’ in one position; it isn’t easy to flip between the two. This produces two possibilities. The two structures cannot interchange easily so the atoms in the

N10/4/CHEMI/SP2/ENG/TZ0/XX The alkenes are an example of a homologous series. (a) [1] State the name of the alkene shown. Key: Carbon atom Hydrogen atom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (b) Bromine water, Br2 (aq), can be used to distinguish between the alkanes and the alkenes. (i) Describe the colour change observed when the alkene shown in part (a) is added to

(4) (Total 8 marks) 7. There are five structural isomers of the molecular formula C5H10 which are alkenes. The graphical formulae of two of these isomers are given. Isomer 1 Isomer 2 Draw the graphical formulae of two of the remaining alkene structural isomers. (Total 2 marks) 8. (a) Petrol engines in cars produce a number of pollutants which can be removed by catalytic converters. Discuss this statement, indicating

Bromination of trans- Stilbene to form 1,2- Dibromo- 1,2-diphenylethane Abstract 1,2-dibromo-1,2-diphenylethane was produced by the bromination of trans-stilbene through the addition of hydrobromic acid (HBr) and hydrogen peroxide (H2O2). This experiment was a greener bromination of stilbene because bromine was generated in situ and ethanol was used as the solvent. The melting point (243.30°C), mass (.427g), and percent yield (45.54) of the crystals were recorded. The FTIR

Through this lab, we were exposed to the essential laboratory techniques used for hydrating an alkene to form an alcohol. We gained familiarity with techniques such as infared spectroscopy, separation, and extraction. Using these techniques, we performed hydroboration/oxidation to styrene to yield 2-phenylethanol. Afterwards, we evaluated the success of the lab by performing an IR. In regards to my yield, I only collected 1.007g of product while the theoretical yield was 1.8g. Therefore, my percent

compound that is also known as ascorbic acid. The molecular formula for Vitamin C is C6O8H6. This structure contains a 5-membered ring. Vitamin C contains 4 alcohol functional groups, an alkene, and an ester. Within the ring it contains one double bond, the carbon=carbon bond in the ring structure, this is an alkene functional group. The Vitamin C structure also contains an ester which helps form the five-membered ring. Vitamin C is a water-soluble vitamin and a polar molecule because it contains other

glycerol. Table 4.3: Comparing the functional group for treated glycerol and commercial glycerol Functional Group Spectra Value (cm -1) Treated glycerol Commercial glycerol Hydroxyl (O-H)- 3394.2700 3299.9600 Aromatic methoxyl (C-H) 2950 2934.1100 Alkenes (C=C) N/A 3022 Soap (COO) 1365.4100 1455 Carbonyl (-C=O) 1645.6200 NA Alcohol (C-OH) 1015.2800 1038.5400

resulting in the formation of a double bond, forming an alkene. In this reaction, a major product (2-methyl-2-butene) and a minor product (2-methyl-1-butene) are formed. Two products were formed because two different beta protons were available for elimination, resulting in the double bond being put in two different positions. However, one of the products is favored and considered major because of Zaitsev’s rule that states the more substituted alkene is favored.

a designated carbon site after norbornene is hydrated is determined by Markovnikov's rule. Markovnikov's rule indicates the location of the hydrogen and hydroxyl group when the ends of the C=C double bond of an alkene are not identical. However, the substituents on the ends of the alkene are identical, as demonstrated by each structure. Thus, the placement of the hydrogen atom and hydroxyl group on which carbon does not matter because it will yield the same product. This explains why the structures