Abstract Synthetic approaches to 2-ethynyl-2-cyclopenten-1-ones (A) by dehydratation of the readily obtainable 2-(1-alkynyl)-2-hydroxy-cyclopentanones 1 a and 1 b were investigated. The synthesis of 2-(3, 3, 3-triphenylpropynyl)-2-cyclopenten-1-one (6) was achieved by reaction of 1-(3, 3, 3-triphenylpropynyl)-6-oxabicyclo [3.1. 0] hexane (3 b) with HCl and CrO 3-oxidation of the resulting 2-(3, 3, 3-triphenylpropynyl)-2-cyclopenten-1-ol (4).
![[3-(cyclopenten-1-yl)-1,1-diphenylprop-2-ynyl]benzene结构式](https://image.chemsrc.com/caspic/187/58149-19-2.png)
