Reactions of resonance stabilized anions. 35. Electron transfer processes. 18. Reaction of 2-halo-2-nitropropanes and 2,2-dinitropropane with resonance-stabilized carbanions and 1-alkynyllithiums
Synthesis of Trimethyl α-Keto Trithioorthoesters and Dimethyl α-Keto Dithioacetals by Reaction of Acyl Chlorides, Anhydrides, Thiol Esters, and N,N-Dimethylamides with [Tris(methylthio)methyl]lithium
RhH(PPh3)4, 1,2-bis(diphenylphosphino)ethane (dppe), and dimethyl disulfide, ketones without α-activating groups were α-methylthiolated with 1,2-diphenyl-2-methylthio-1-ethanone giving α-methylthio ketones. The reaction of unsymmetrical ketones proceeded at the more substituted carbons. The initial formation of kinetic α-methylthiolated products followed by their rearrangement to thermodynamic products was
Under mild aprotic conditions α-halo carbonyl compounds react with diphenyl disulfide in the presence of sodium telluride to give the corresponding α-phenylthio derivatives in good to moderate yields. The reaction appears to proceed involving the sulfur–sulfurbondcleavage of diphenyl disulfide by sodium telluride.
A direct di-sulfenylation of methyl ketones with disulfides mediated by KOH-DMSO superbase system has been developed. This reaction provides an efficient route to α,α-dithioketones, which has the advantages of readily available non-prefunctionalized substrates, good functional group tolerance, excellent yields as well as high selectivity. In a single operation, two CS bonds are simultaneously built
已经开发了由 KOH-DMSO 超碱体系介导的甲基酮与二硫化物的直接二苯基化反应。该反应为制备α,α-二硫酮提供了一条有效的途径,具有易于获得的非预官能化底物、良好的官能团耐受性、优异的收率和高选择性等优点。在一次操作中,在温和的反应条件下,两个 C S 键同时建立在同一个碳原子上。
�ber Alkyl-(?-oxy-?-aryl-�thyl)-sulfide und Dialkyl-(?-oxy-?-aryl-�thyl)-sulfonium-salze