Solid-state Structures for 2-Methoxy-1,3-xylyl-18-crown-5 and 2-Methoxy-1,3-xylyl-21-crown-6:A Search for C-H...O Interactions

摘要

Solid-state structures have been determined for 2-methoxy-1,3-xylyl-18-crown-5(4)(monoclinic,P2_1,a = 11.361(3)A,b = 8.352(3)A,c = 18.627(4)A,beta = 91.05(2)°,Z = 4)and 2-methoxy-1,3-xylyl-21-crown-6(5)(monoclinic,Pc,a = 9.996(2)A,b = 11.321(2)A,c = 8.642(2)A,beta= 100.095(4)°,Z = 2).In both molecules,the aromatic units are tilted with respect to the polyether ring and the methoxyl methyl hydrogens are oriented toward ether oxygen atoms of the rings.The interatomic distances,particularly the H...O distance and angles provide important information regarding the strength of the C-H...O interactions.