tert-Butyl phenyl sulfoxide is employed as a traceless precatalyst for the generation of sulfenate anions under basic conditions and has been used to catalyze the coupling of benzyl halides to trans-stilbenes. The advantage of this precatalyst over previous precatalysts is that the byproduct generated on catalyst formation is a gas, facilitating product isolation in high purity. Using this second generation catalyst, a variety of trans-stilbenes were generated in 39–98% isolated yield.

中文翻译：

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叔丁基苯基亚砜：无痕的亚磺酸根阴离子预催化剂

叔丁基苯基亚砜用作在碱性条件下生成亚磺酸根阴离子的无痕迹预催化剂，并已用于催化苄基卤化物与反式-苯乙烯基苯甲酸酯的偶联。该预催化剂相对于先前的预催化剂的优点在于，催化剂形成时产生的副产物是气体，有利于高纯度的产物分离。使用第二代催化剂，可以产生39-98％的分离产率的各种反式-苯乙烯。