133817-07-9

Upstream product

• 133817-05-7 ((1-ethoxy-2-methylprop-1-en-1-yl)oxy)triethylsilane 
• 5650-07-7 3-methyl-1-phenyl-but-2-en-1-one 
• 13735-81-4 1-styrenyloxytrimethylsilane 
• 43108-74-3 3-hydroxy-3-methyl-1-phenyl-1-butanone 
• 98-86-2 acetophenone 
• 175849-02-2 Trifluoro-acetic acid 1,1-dimethyl-3-oxo-3-phenyl-propyl ester 

Relevant academic research and scientific papers

Mechanism of Mukaiyama-Michael reaction of ketene silyl acetal: Electron transfer or nucleophilic addition?

Mechanism of Mukaiyama-Michael reaction of ketene silyl acetal has been discussed. The competition reaction employing various types of ketene silyl acetals reveals that those bearing more substituents at the β-position react preferentially over less substituted ones. However, when ketene silyl acetals involve bulky siloxy and/or alkoxy group(s), less substituted compounds react preferentially. The Lewis acids play an important role in these reactions. Enhanced preference for the more sterically demanding Michael adducts is obtained with Bu2Sn(OTf)2, SnCl4, and Et3-SiClO4 in the former reaction while TiCl4 gives the highest selectivity for the less sterically demanding products in the latter case. These results are interpreted in terms of alternative reaction mechanisms. The reaction of less bulky ketene silyl acetals are initiated by electron transfer from these compounds to a Lewis acid. On the other hand, bulkier ketene silyl acetals undergo a ubiquitous nucleophilic reaction. Such a mechanistic change is discussed based on a variety of experimental results as well as the semiempirical PM3 MO calculations.

ACTIVATION OF KETENE SILYL ACETALS BY 10-METHYLACRIDINIUM PERCHLORATE: A NOVEL CATALYSIS IN MUKAIYAMA REACTION

10-Methylacridinium perchlorate (1) effectively promotes various reactions of ketene silyl acetals: aldol and Michael addition products are obtained with aldehydes, ketones, acetals, and α-enones.The reactions exhibit unusual dependency upon 1, namely the yields are excellent when a catalytic amount of 1 is employed whereas no desired products are accessible by the use of 1 in a stoichiometric quantity.A novel catalytic cycle is proposed.