Photolysis of P, P-bis (o-methoxypheny1)-substituted vinyl bromides gave benzofuran derivatives which are derived from an intramolecular nucleophilic attack of the methoxyl group on an intermediate vinyl cation. With a-aryl-substituted vinyl bromides, only one type of benzofuran derivative was detected. However, when the a substituent was a hydrogen or a methyl group, two isomeric benzofurans were formed, one via the unrearranged vinyl ...
![1-[1-bromo-2,2-bis(2-methoxyphenyl)ethenyl]-4-methoxybenzene Structure](https://image.chemsrc.com/caspic/131/62378-29-4.png)
![1,6-dimethoxyphenanthro[9,10-b]benzofuran Structure](https://image.chemsrc.com/caspic/230/79534-26-2.png)
![1-methoxy-2-[2-(2-methoxyphenyl)ethynyl]benzene Structure](https://image.chemsrc.com/caspic/485/5293-78-7.png)
![1-[2-bromo-1-(2-methoxyphenyl)-2-phenylethenyl]-2-methoxybenzene Structure](https://image.chemsrc.com/caspic/200/62378-32-9.png)
