| 中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
|---|---|---|---|---|
| 4-叔丁基-2-[3-(5-叔丁基-2-甲氧基苯基)丙基]-1-甲氧基苯 | 1,2-bis(5-tert-butyl-2-methoxyphenyl)propane | 108656-63-9 | C25H36O2 | 368.56 |
| 中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
|---|---|---|---|---|
| —— | 9,16,25,32-Tetrahydroxy<3.1.3.1>metacyclophane | 142836-06-4 | C32H32O4 | 480.604 |
| —— | 6,13,22,29-Tetra-tert-butyl-9,16,25,32-tetramethoxy[3.1.3.1]metacyclophane | 142836-05-3 | C52H72O4 | 761.141 |
| —— | 1,2-proximal-9,25-bis(benzyloxy)-6,13,22,29-tetra-tert-butyl-16,32-dihydroxy[3.1.3.1]metacyclophane | 203717-52-6 | C62H76O4 | 885.283 |
| —— | distal-9,32-bis(benzyloxy)-6,13,22,29-tetra-tert-butyl-16,25-dihydroxy[3.1.3.1]metacyclophane | 203717-54-8 | C62H76O4 | 885.283 |
| —— | 9-benzyloxy-6,13,22,29-tetra-tert-butyl-16,25,32-trihydroxy[3.1.3.1]metacyclophane | 203717-50-4 | C55H70O4 | 795.158 |
| —— | distal-9,25-bis(benzyloxy)-6,13,22,29-tetra-tert-butyl-16,32-dimethoxy[3.1.3.1]metacyclophane | 203717-57-1 | C64H80O4 | 913.337 |
| —— | 9,16,25,32-Tetraallyloxy[3.1.3.1]metacyclophane | 193225-01-3 | C44H48O4 | 640.863 |
An attempted O-alkylation of the flexible macrocycle tetrahydroxy[3.1.3.1]metacyclophane (1) with 4-(chloromethyl) pyridine (2a) in the presence of NaH under THF reflux gave 1,3-di-O-substitution product distal-3a as a major product. In contrast, tetraol 1 was O-alkylated with 2a in the presence of Cs2CO3 to afford a mixture of two conformers of tetra-O-alkylated product 4a in a ratio of 77:23 (1,4-alternate-4a:partial-cone-4a) in 95% yield. No formation of the cone conformer in the reaction of the tetraol 1 with 2a, in comparison with those with 2-(chloromethyl) pyridine (2b) or benzyl bromide (2c) in the presence of NaH or K2CO3, which predominantly afforded cone-conformer, might be attributable to the absence of contributions derived from cationN interactions as well as cationπ interactions. The latter effect might be much smaller because of the decreased π-density of the pyridine ring compared to that of the benzene ring. The structural characterization of these products in solution as well as solid state is also discussed.Key words: macrocycles, calixarenes, cyclophanes, [3.1.3.1]metacyclophanes, O-alkylation, conformation, crystal structure, cationN interaction.