ETHYLATION OF ADAMANTANE NUCLEUS WITH BF{11 {0 ETHERATE

摘要

Adamantane hydrocarbons of the C10-C30 range having one to four open bridgehead positions are ethylated by the reaction of a mixture of boron fluoride etherate and sulfuric acid (90-100 percent H2SO4 equivalent by weight) or fluorosulfonic acid (HFSO3) at a temperature in the range of -10 DEG to 100 DEG C. During the reaction, the adamantane nucleus remains intact and any alkyl groups attached thereto in the adamantane hydrocarbon charge remain at the original position. Ethylation occurs only at bridgehead positions of the nucleus and from one to four alkyl or cycloalkyl groups can be substituted if such bridgehead positions are open in the starting hydrocarbon. The ethylation product has one or more ethyl substituents than the starting hydrocarbon, which substituents are attached to the adamantane nucleus at bridgehead positions.