Tetramethyl acetals of alkynedials were prepared by anodic oxidation of corresponding alkyne-1,ω-diols (C4 and C6) in trimethyl orthoformate on glassy carbone anode in 80% yield. 1,1,4,4-Tetramethoxybut-2-yne (2a) can be prepared by this one-step procedure from but-2-yne-1,4-diol (1a) instead of a multistep chemical procedure starting from 2,5-dimethoxyfuran. Propargyl alcohol (3) can be similarly anodically oxidized in trimethyl orthoformate giving dimethyl acetal of propynal (4) in 85% yield.
使用三甲基正
甲酸酯在
玻璃碳阳极上对相应的炔二醛(C4和C6)的炔-1,ω
-二醇进行阳极氧化,可制备炔二醛的四甲基
缩醛,收率为80%。1,1,4,4-四甲氧基丁-2-炔(2a)可以通过这种一步法从丁-2-炔-1,4
-二醇(1a)制备,而不是从2,5-二甲氧基
呋喃出发进行多步
化学过程。
丙炔醇(3)可以类似地在三甲基正
甲酸酯中进行阳极氧化,产生
丙炔醛的二甲基
缩醛(4),收率为85%。