From my lab manual can you state (in words) words, what REAGENTS in the lab Sterochemistry of bromine addition caused my product to
A) create a bridge bromoium ion
B) the bromoin anion in anti fashion attacks from top or bottom side generating erthyro-2,3-dibromo-3 phenylpropanoic acid
C) the starting of trans compound is converted by anti addition to erthyro-2,3- dibromo-3 phenylpropanoic acid
Microscale out. Weigh 1.00 mmol of trans-cinnamic acid into a 3-mL conical vial, and Reaction. Carry out the reaction under the hood, and wear gloves through- add 0.8 mL of glacial acetic acid and a stirring device. Attach an air con Take denser and clamp the apparatus to a ring stand, then stir [OP-10] this tact xture in a 50°C water bath until most of the cinnamic acid has dissolved. S easure 1.0 mL of a 1.0 M solution of bromine in acetic acid into a conical Va vial, and add [OP-11] this solution through the top of the condenser with a 9-inch Pasteur pipet. Heat the reaction mixture in the 50° hot water bath until the red-brown bromine color fades to light orange; then continue to heat the reaction mixture for 15 minutes. If the mixture becomes colorless (or nearly so) during this period, add more of the bromine/acetic acid solu- tion dropwise until the color just persists. If the mixture has a distinct orange color at the end of the reaction period, add a drop or two of cyclohexene to s turn it light yellow Separation. Cool the reaction mixture in an ice/water bath for 10 minutes or more, scratching the sides of the vial to induce crystallization, if neces- sary. Collect the product by vacuum filtration [OP-16] and wash it on the r IOP-26a] with several portions of ice-cold water, until the acetic acid odor is hardly noticeable. Purification and Analysis. Purify the product by recrystallization [OP-28] rom 50% aqueous ethanol, washing it on the filter [OP-26a] with cold 50% ethanol. Dry [OP-26b] the 2,3-dibromo-3-phenylpropanoic acid and
Organic Chemistry- addition of bromine to an Alkene
For a lab the preparation of 2,3-dibromo-3 phenylpropanoic acid was done. 1.2 g of trans-cinnamic acid was dissolved in 4 ml of glacial acetic acid. 2.5 g of pyrimide tribromide was added to trans-cinnamic acid solution. Then a refulx appratus was assembled and the mixture was heated 1 hr. When the reflux was done, the mixture was cooled at room temperature and 15 ml of water was added to cool the solution on ice. The crude product was collected using a vacum filter and then transferred to a 25 ml Erlenmeyer flask. 3 ml of ethanol was heated and more ethanol was added to dissolve the collected product. Water was added on equal amounts of the total amount of ethanol used. The ethanol-water mixture was cooled at room temperature and then cooled on an ice water. The recrystallized product was collected through vacum filteration. The melting point was measured.
a. The melting point of the addition of bromine to trans cinnamic acid was a range of (189.2 C to 202.7C) so determine the sterochemistry of this addition of bromine to trans cininamic acid. what was the overall purpose of this experiment and what does the melting range indicate or can help conclude about the experiment? please be specific.
