Potassium terf-butanol

Molybdenum-based catalysts are highly active initiators, however, monomers with functionalities with acid hydrogen, such as alcohols, acids, or thiols jeopardize the activity. In contrast, ruthenium-based systems exhibit a higher stability towards these functionalities (19). An example for a molybdenum-based catalyst is (20) MoOCl2(t-BuO)2, where t-BuO is the tert-butyl oxide radical. The complex can be prepared by reacting M0OCI4 with potassium tert-butoxide, i.e., the potassium salt of terf-butanol. 

The interaction of the aldehydo derivatives 14a, 14b, and 55 with methylenetriphenylphosphorane has been re-investigated92 with the use of a 1 1 potassium terf-butoxide-fert-butanol complex in the reaction mixture. This modification affords significantly increased yields of the final alkenes (15a, 15b, and their 3-O-benzyl analogs). 

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