<i>N</i>-Dimethylaluminum-<i>N</i>′,<i>N</i>′-Dimethylhydrazide: A New and Efficient Reagent for the Synthesis of<i>N,N</i>-Dimethylhydrazones and<i>N</i>-Unsubstituted Hydrazones
作者:Benno Bildstein、Peter Denifl
DOI:10.1055/s-1994-25427
日期:——
N-dimethylaluminum-N′,N′-dimethylhydrazide, synthesized from N,N-dimethylhydrazine and trimethylaluminum, reacts with aromatic ketones or with electronically unfavourable substrates to give the corresponding hydrazones in high yield. Subsequent exchange with anhydrous hydrazine affords the N-unsubstituted hydrazones.
Tropothione has been effectively synthesized as unstable red crystals and fully characterized by various spectroscopies as well as pKa and dipole moment measurements together with chemical characterization reactions. The properties of tropothione was revealed to differ considerably from those of tropone.
Tropothione S-sulfide is synthesized from tropone hydrazone with disulfur dichloride in deaerated chloroform at −78 °C. The S-sulfide is detected as an unprecedented [10π + 2π]-type cycloadduct with dimethylacetylenedicarboxylate.
Tropothione S-硫化物是在脱气氯仿中在 -78 °C 下由腙腙和二氯化二硫合成的。S-硫化物被检测为前所未有的 [10π + 2π] 型环加合物与乙炔二羧酸二甲酯。