 In addition to the reactions originally reported by Johnson , Corey , and Chaykovsky , sulfur ylides have been used for a number of related homologation reactions that tend to be grouped under the same name . 
 In addition to the reactions originally reported by Johnson , Corey , and Chaykovsky , sulfur ylides <a href='been_done' title='1'><mark>have</mark></a> been used for a number of related homologation reactions <a href='null_relcl' title='2'><mark>that</mark></a>tend to be grouped under the same name . 
In addition to the reactions originally reported by Johnson , Corey , and Chaykovsky , sulfur ylides done been used for a number of related homologation reactions tend to b grouped under da same name .