Naphthalene-Based Calixarenes: Unusual Regiochemistry of a Friedel−Crafts Alkylation
作者:Berkeley J. Shorthill、Timothy E. Glass
DOI:10.1021/ol006980+
日期:2001.2.1
[GRAPHICS]In the pursuit of naphthalene based calixarenes, a Friedel-Crafts alkylation with unusual regiochemistry was observed. Treatment of carbinol 14 with catalytic triflic acid was expected to produce calixarenes of the class represented by 16. Instead, the major product was cyclic trimer 15, in which alkylation of each naphthalene ring occurred at the electronically deactivated position. The structure of compound 15 was assigned by 2-D NMR studies.
Synthesis of 3,5- and 3,6-Linked Calix[<i>n</i>]naphthalenes
作者:Berkeley J. Shorthill、Robert G. Granucci、Douglas R. Powell、Timothy E. Glass
DOI:10.1021/jo0161173
日期:2002.2.1
The preparation of calix[n]naphthalenes fromderivatives of 2,7-dihydroxynaphthalene is described. 1,8-Dialkyl substitution is used to direct the regiochemistry of the acid-catalyzed condensation reactions. Acyclic peri substituents lead to a 3,5-linked calix[3]naphthalene, whereas cyclic peri substituents give predominantly a calix[5]naphthalene with the corresponding 3,6-linkage. The 3,6-linked calix[4]naphthalene