workers' have improved upon this general reaction so that it would be useful in cases where the acetylenic moiety is a valuable intermediate. The use of Bl-alkylyl-g-borabicyclo [3.3. l] nonanes avoids the waste of the two residual alkynyl units on th. e reagent used in reaction 4. The following reaction in pentane at room temperature gives high yields of 4-alkynyl-2- butanones with methyl vinyl ketone and related ketones able to adopt a cisoid ...
![[oct-1-yn-3-yloxy(diphenyl)methyl]benzene Structure](https://image.chemsrc.com/caspic/330/52418-74-3.png)