Method for obtaining 3,5-bis(4-bromphenyl)-2,4-bis(4-methoxyphenyl)tetrahydro-2H-pyran

摘要

the object of the application is a way of 3,5-bis (4-bromophenyl) - 2,4 - bis (4-methoxyphenyl) - 2h - tetrahydro pyrene of model 1, which is thatthat (e) - 1 - bromo - 4 '- metoksystilbenu in methylene chloride is added and mixed with paraformaldehyde in an inert gas atmosphere at room temperature by adding boron trifluoride diethyl ether slowly in temperaturze peaceful, all mixed in for at least 3 hours at a temperature of 20 to 30 oc, then the methanol and water are extracted.the organic layer is concentrated and the crude product is purified by reagenty is used in stoichiometric quantities.