WebIn the presence of catalytic amounts of GaCl 3 (10 mol%) and 2,6-di(t-butyl)-4-methylpyridine (10 mol%), five- or six-membered ring ketones possessing α,α′-disubstituents are ethenylated at the α-carbon with triethylsilylethyne at 180°C. The roles of the base are to inhibit decomposition of the products and to promote proto-degallation of the … WebThe 17α-ethenylated (vinylated) testosterone derivative norvinisterone (vinylnortestosterone) is much more potent as an AAS than the 17α-ethynylated testosterone derivatives and is intermediate in potency between the 17α-ethynylated progestins and conventional AAS, with approximately one-third and one-fifth of the …
GaCl3-Promoted Ethenylation of Thioester Silyl Enolate and …
WebAbstract. Silyl enol ethers derived from substituted cyclohexanones are ethenylated with trimethylsilylethyne in the presence of GaCl 3. Carbon-carbon bond formation was … WebBoth acyclic and cyclic ketones can be ethenylated in this manner (Table 5). The configuration of the silyl enol ether was found to be unimportant with the β-enone being 10 the major product. α-Substituted β-ketoesters and malonates may be ethenylated in a similar fashion.25 A notable aspect of this methodology is its application to the ... 大谷に
List of androgens and anabolic steroids - Wikipedia
WebJun 21, 2005 · Different organotin phenoxides react at room temperature with diethyl acetylenedicarboxylate in diethyl ether, in the presence of lithium perchlorate to give a mixture of corresponding phenyl vinyl... WebOct 26, 2004 · In the presence of catalytic amounts of GaCl3 (10 mol%) and 2,6-di (t-butyl)-4-methylpyridine (10 mol%), five- or six-membered ring ketones possessing α,α′ … WebNov 3, 1992 · ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access … 大谷 fa いつ