Science Homework Help

Introduction The addition of molecular bromine to the double bond of an alkene is an example of the most commonreaction of multiple bonds (i.e. bonds containing a 11: bond). This type of reaction is called addition. In these types of reaction, the 1: bond is broken and a new bond is formed to both carbons of the multiplebond (i.e. double or triple bond). As the multiple bond is electron rich, addition reactions occur withreagents that can form positively charged atoms called electrophiles (i.e. electron loving). Proton, H+,is the most common electrophile, so multiple bonds react with any reagent that can produce a protonlike mineral acids, HX (X = F, Cl, Br, I, OH etc). Other compounds, such as halogens, react quickly tomultiple bonds in addition reactions, but do not appear to be able to form electrophiles. In this experiment, you will brominate the alkene, trans-cinnamic acid, and isolate the product, 2,3-dibromo-3-phenylpropanoic acid. trans-cinnamic acid 2,3-dibromo—3-phenylpropanoic acid The product of this addition (and many additions to alkenes) yields two chiral carbons and hence 4stereoisomers. These stereoisomers are grouped into 2 enantiomeric pairs. One enantiomeric pair isthe (28,38) and (2R,3R) stereoisomers which have a melting point of 94°C. The other pair is the (25,3R)and (2R,3S) stereoisomers which have a melting point of 203°C. In this experiment, you will determine