What would be observed if the phase-transfer catalyst, tetrabutylammonium bromid

Question

What would be observed if the phase-transfer catalyst, tetrabutylammonium bromide, was omitted? Why? It was essential to stir the reaction mixture vigorously to obtain acceptable results. Why? Why was it necessary to cool the reaction mixture to room temperature prior to the extractions? Why was the reaction flask rinsed with diethyl ether? Why was the crude reaction mixture extracted twice, not once, with deionized water? Why are cis- and trans-stilbene visible on a TLC plate when viewed with short-wave ultraviolet light? Use the curved-arrow notation to draw the mechanism for the formation of cis-stilbene from benzaldehyde. Use the curved-arrow notation to draw the mechanism for the formation of trans-stilbene from benzaldehyde.

Explanation / Answer

1. Tetrabutyal ammonium bromide (TBAB) is a phase transfer catalyst (PTC). Which facilitates migrtaion of reactant from one phase to the other where reaction occurs.

If we omit this TBAB PTC then reactants will be inaccesible to each other and reaction rate will be lower. collision between the reacting molecules will reduce.

2. Reaction mixture is stirred to get same concentration everywhere.

sometimes if dissolved solids are there in system they may get settled down and reduce concentartion.

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