CH,CH,CHCH,, CH,CH,CH,CH,Br, (CH,),CCH,CH, and CH,CH,CH,CI Br CI

Demonstrate the results of the reactions between this alkyne and the various reagents.

The SN1 mechanism starts with the rate-determining step which is the dissociation of the alkyl halide into a carbocation and a halide ion. The next step is the rapid reaction of the carbocation intermediate with the nucleophile; this step completes the nucleophilic substitution stage. The step that follows the nucleophilic substitution is a fast acid-base reaction. The nucleophile now acts as a base to remove the proton from the oxonium ion from the previous step, to give the observed product. Draw a curved arrow mechanism for the reaction, adding steps as necessary. Be sure to include all nonzero formal charges.

Which of the following reactions of alkenes takes place with anti stereochemistry only? Addition of H2O0 in the presence of H2SO4 Reaction with peroxy acid (RCO3H). Addition of HBr Addition of BH3 followed by H2O2/HO™