Stable simple enols. 11. Equilibrium constants for the 1-alkyl-2,2-dimesitylethenol/1-alkyl-2,2-dimesitylethanone systems in hexane. The predominance of steric effects on Kenol values
Formation of .alpha.-[bis(dimethylamino)phosphoryl]-substituted stable enols and N,N-dialkyl diarylacetamides from diarylketenes and methyllithium in hexamethyl phosphoric triamide
作者:Ella B. Nadler、Elana S. Zipory、Zvi Rappoport
DOI:10.1021/jo00013a031
日期:1991.6
The reaction of an MeLi/HMPA mixture in ether with dimesityl- and mesitylphenylketene yielded the enols MesC(Ar) = C(OH)PO(NMe2)2 and MesC(Ar) = CHOH and the amides MesCH(Ar)CON(Me)R (Ar = Mes, Ph; R = Me, Et) together with other products. An initial cleavage of the HMPA by the MeLi, followed by addition of the formed anionic species (Me2N)2PO-, Me2N-, or MeN-Et to the diarylketene, is proposed.