Question

Alkyne, Alkene reactions and sythesis problem help

Question 1 Which molecule can you put instead of "?" in the reaction scheme below: de hacer esºs que

Answer 1

1- there is a elemination reaction where more subusttuted alkene will be form as a major product and then ozonolysis will form

2- alkyne + birch reduction = formation of trans alkene

3- the addition of HBr will be with more electron rich alkyne only

4- simple syn hydroboration on alkene and alkyne both .In alkene hydroboration alcohol will form and in alkyne first vinyl alcohol will form and than isomrise and aldehyde will form

5- this reaction calles mercuration-demercuration first mercurium ion ring will form and it opens from more hindered side and on positive side OH- will attack....

Angh - A + Na NH3 And 4 BH3, H2O2 , OH