91Ó°ÊÓ

a.

Alkynes can be converted to geminal dihalides by treating them with the respective halides

Product of reaction a

b.

Product of reaction b

c. Alkenes can be converted to alkynes by converting them to a geminal dihalide and then reducing them with a strong base.

Product of reaction c

d. The reaction is an example of hydroboration oxidation where an alkyne is oxidized to aldehyde or ketone depending on its position in the chain (terminal or internal).

Product of reaction d

e.

Product of reaction e

f.

Product of reaction f

g.

Product of reaction g

h.

Product of reaction h

i.

Product of reaction i

j.

Product of reaction j