Intramolecular [2+2] Photocycloaddition. 5. Synthetic Methods toward [2.n]-, [3.n]-, and [4.n]Naphthalenophane Skeletons by Using α,ω-Bis(vinylnaphthyl)alkanes
Intramolecular [2+2] Photocycloaddition. 5. Synthetic Methods toward [2.n]-, [3.n]-, and [4.n]Naphthalenophane Skeletons by Using α,ω-Bis(vinylnaphthyl)alkanes
The coupling reaction of Grignard reagents with α,β-dibromoalkanes took place smoothly in THF/ HMPA (12:1) in the presence of a catalytic amount of copper(I) bromide and gave the products in 60–100% yields. Several α,ω-bis(vinylaryl)alkanes were prepared in reasonable yields by the application of this reaction.