title: Methoxy-ether and crown-ether derivatives of tetrahomodioxa- and octahomotetraoxacalix[4]arenes.
abstract: Three methoxy-ether and one methoxy-ether/crown-ether derivatives of p-tert-butyltetrahomodioxa- and p-R-octahomotetraoxacalix[4]arenes (R = methyl, tert-butyl, H) have been investigated. The first three compounds, 7,15,21,27-tetra-tert-butyl-29,30,31,32-tetramethoxy-3,11-dioxapentacyclo[23.3.1.1(5,9).1(13,17).1(19,23)]ditriaconta-1(29),5,7,9(30),13,15,-17(31),19,21,23(32),25,27-dodecaene, C(50)H(68)O(6), 33,34,35,36-tetramethoxy-7,15,23,31-tetramethyl-3,11,19,27-tetraoxapentacyclo[27.3.1.1(5,9).1(13,17).1(21,25)]hexatriaconta-1(33),5,7,9(34),13,15,17(35),21,23,25(36),29,31-dodecaene, C(40)H(48)O(8), and 7,23-di-tert-butyl-33,34,35,36-tetramethoxy-3,11,19,27-tetraoxapentacyclo[27.3.1.1(5,9).1(13,17).1(21,25)]hexatriaconta-1(33),5,7,9(34),13,15,17(35),- 21,23,25(36),29,31-dodecaene, C(44)H(56)O(8), in the partial-cone or 1,2-alternate conformations, present the common feature of methoxy-ether self-inclusion, while the fourth, 42,43-dimethoxy-7,15,23,31-tetramethyl-3,11,19,27,34,37,40-heptaoxahexacyclo[15.15.9.1(5,9).1(21,25).0(13,41).0(29,33)]tritetraconta-5(42),6,8,13(41),14,16,21(43),22,24,29(33),30,32-dodecaene, C(42)H(50)O(9), adopts the 1,3-alternate conformation owing to the presence of a 1,3-polyether chain.
authors.affiliation: Dipartimento di Chimica and Centro CNR di Studio sui Meccanismi di Reazione, Università La Sapienza, Box 34, Roma 62, P.le Aldo Moro 5, 00185 Roma, Italy.
authors.forename: B
authors.initials: B
authors.lastname: Masci
authors.forename: S
authors.initials: S
authors.lastname: Saccheo
authors.forename: M
authors.initials: M
authors.lastname: Fonsi
authors.forename: M
authors.initials: M
authors.lastname: Varrone
authors.forename: M
authors.initials: M
authors.lastname: Finelli
authors.forename: M
authors.initials: M
authors.lastname: Nierlich
authors.forename: P
authors.initials: P
authors.lastname: Thuéry
mesh_terms: D047250:Calixarenes; D018360:Crystallography, X-Ray; D004987:Ethers / Q000737:chemistry*; D004988:Ethers, Cyclic / Q000737:chemistry*; D006860:Hydrogen Bonding; D046911:Macromolecular Substances; D008958:Models, Molecular; D008968:Molecular Conformation
chemical_list: D004987:Ethers; D004988:Ethers, Cyclic; D046911:Macromolecular Substances; D047250:Calixarenes