Synthesis of monoalkylated calix[4]arenes via direct alkylation
作者:Leo C. Groenen、Bianca H.M. Ruël、Alessandro Casnati、Willem Verboom、Andrea Pochini、Rocco Ungaro、David N. Reinhoudt
DOI:10.1016/s0040-4020(01)96179-4
日期:1991.9
A new one-step procedure for the synthesis of monoalkylated calix[4]arenes is presented. Reaction of calix[4]arene 1a or 1b with 1.2 equivalent of a weak base (K2CO3 in MeCN or CsF in DMF) and excess of alkylating agent affords the monoalkylated calix[4]arenes in moderate to good yields.
提出了一种新的一步法合成单烷基杯[4]芳烃。杯[4]芳烃1a或1b与1.2当量的弱碱(MeCN中的K 2 CO 3或DMF中的CsF)和过量的烷基化剂反应,得到单烷基化的杯[4]芳烃,产率中等至良好。
Regioselective Monoalkylation of Calixarenes. Synthesis of Homodimer Calixarenes
the p-tert-butylcalix[4]- and -[6]arenes using bis(butyltin)oxide and different alkylating agents is described. The procedure is remarkable for the mild conditions used allowing an efficiently access to monoalkylated calixarene derivatives in moderate to good yields. Monoalkynylcalix[4]arene and monoalkynylcalix[6]arene have been synthetically exploited for the synthesis of bis-calix[n]arenes (n =
In the title solvated calixarene, C47H60O4 center dot 2CHCl(3), the host chalice displays an almost undistorted cone conformation, stabilized by three strong O-H center dot center dot center dot O hydrogen bonds at the calixarene's lower rim. One chloroform solvent molecule is fixed in the calixarene cavity by C-H center dot center dot center dot pi interactions, while the second is accommodated in a clathrate-like mode in elliptical packing voids. These voids are spanned by six host molecules connected via C-H center dot center dot center dot pi contacts and van der Waals interactions. Within the crystal structure, one tert-butyl group of the calixarene host is disordered over two orientations, with occupancies of 0.884 (4) and 0.116 (4). Furthermore, both solvent molecules show disorder, with occupancies of 0.857 (2) and 0.143 (2) for the cavitate-type, and 0.9359 (17) and 0.0641 (17) for the clathrate-type chloroform solvent molecules.