[viet]

can someone check if this is right? i'm suppose to write the structural formula for this reaction.

CH₃CH₂CH₂CCH  1.NaNH₂/2.CH₃CH₂CH₂Br

I got the answer: CH₃CH₂CH₂CCCH₂CH₂CH₃

[Jorriss]

can someone check if this is right? i'm suppose to write the structural formula for this reaction.

CH₃CH₂CH₂CCH  1.NaNH₂/2.CH₃CH₂CH₂Br

I got the answer: CH₃CH₂CH₂CCCH₂CH₂CH₃

Yup, that looks good.

[bromidewind]

You got it except for two minor things.
1. It's Na/NH₃, not NH₂.
2. If asked, be sure you remember the anti- stereochemistry that the hydrogens add by. The resulting alkene will take on a trans- configuration rather than cis-.

[dunno260]

It is NaNH₂ and not Na/NH₃ which would reduce the alkyne to an alkene.  You want a strong base to deprotonate the alkyne to create the nucleophilic alkyne and sodium amide is the one that is typically given in undergrad O Chem textbooks.

[viet]

thanks guys