Tellurobenzaldehydes bearing an electron-withdrawing substituent were generated by way of SnCl4-inducedunsymmetricalcleavage of bis(N,N-dialkylcarbamoyltelluro)arylmethanes, and were trapped using 2,3-dimethyl-1,3-butadiene.
A Convenient Synthesis of Unsymmetrical Tellurides by a Sequential Reductive Cleavage of Bis(N,N-dimethylcarbamoyl) Ditelluride
作者:Kazuaki Shimada、Seiji Oikawa、Yuji Takikawa
DOI:10.1246/cl.1992.1389
日期:1992.7
Bis(N,N-dimethylcarbamoyl) ditelluride was converted to unsymmetrical tellurides possessing various substituents by a convenient stepwise reduction-alkylation or reduction-addition sequence.
Sodium telluride, prepared by heating tellurium and sodium hydride in a 1:2 molar ratio in dry N,N-dimethylformamide, reduces aromatic nitro compounds to azo compounds and thioketones to hydrocarbons under mild conditions.
A Preparation of Alkyl or Alkenyl<i>N</i>,<i>N</i>-Dimethylchalcogenocarbamates and Their One-Step Conversion into Symmetrical Dialkyl or Dialkenyl Dichalcogenides
Alkyl or alkenyl N,N-dimethylchalcogenocarbamates were easily prepared by a stepwise treatment of bis(N,N-dimethylcarbamoyl) dichalcogenides with NaH or NaBH4, followed by various alkylating agents or acetylenes bearing electron-withdrawing substituents. The one-step conversion of alkyl or alkenyl N,N-dimethylselenocarbamates or N,N-dimethyltellurocarbamates into the corresponding symmetrical dialkyl or dialkenyl dichalcogenides was also achieved efficiently by treating with SnCl4.
先用 NaH 或 NaBH4 分步处理双(N,N-二甲基氨基甲酰基)二羰基化合物,再用各种烷基化剂或带有抽电子取代基的乙炔基,就能轻松制备出烷基或烯基 N,N-二甲基羰基氨基甲酸盐。用 SnCl4 处理烷基或烯基 N,N-二甲基硒羰基氨基甲酸酯或 N,N-二甲基碲羰基氨基甲酸酯,也能一步高效地转化为相应的对称二烷基或二烯基二羰基化合物。
REDUCTION OF AROMATIC NITRO COMPOUNDS WITH SODIUM TELLURIDE
作者:Hitomi Suzuki、Hajime Manabe、Masahiko Inouye
DOI:10.1246/cl.1985.1671
日期:1985.11.5
Sodium telluride, prepared by heating tellurium with Rongalite in aqueous sodium hydroxide, easily reduces aromaticnitrocompounds to the corresponding amines in good yields. The reduction can be carried out using a catalytic amount of tellurium, since sodium telluride is readily regenerated in the presence of excess Rongalite.