Offer an explanation for each of the following observations, including the structure of following product and the role of the quaternary ammonium salt.
When sodium benzenethiolate, Na+ PhS- , is mixed with 1-bromooctane in water, no reaction takes place. However, when l-2 mole percent tetrabutylammonium bromide, (CH 3CH2CH2CH2)4 N+ Ba-, is included in the reaction mixture, a product is formed readily.