CHM247H1 Lecture : chm247 all about Alkyne.pdf

Most simple alkyne = ethyne (a. k. a. acetylene) Natural hormones and artificial hormones: artificial hormones in birth control have alkynes where natural hormones do not. Ru 486 (a. k. a. mifepristone, the morning after pill ) Blocks the effect of progesterone, preventing the implantation of a fertilized egg. What are the alkynyl isomers of c4h6: 1-butyne and 2-butyne. What are the alkynyl isomers of c5h8: 1-pentyne, 2-pentyne, and 3-methyl-1-pentyne. Internal r c c r: terminal r c c h. The two different kinds of alkynes have different reactivity. Relatively acidic: bh3, thf/h2o (adds twice, -oh, h2o2. Cis and trans alkene possible: 9-bbn or sia2bh, thf/h2o (adds once, -oh, h2o2. Have similar electronic structure to alkenes, which underwent the following reactions: halogenation (x2, hydrogenation (h2) reduction, hydration (h2o, halohydrogenation (hx, halohydrin formation (x, oh, oxidation. Start numbering the parent chain at the end nearest the c c bond.