title: Crystal structure of 22,24,25-trimethyl-8,11,14-trioxa-25-aza-tetra-cyclo-[19.3.1.02,7.015,20]penta-cosa-2,4,6,15(20),16,18-hexaen-23-one.
abstract: The title compound, C24H29NO4, is the product of a Petrenko-Kritchenko condensation of 1,5-bis-(2-formyl-phen-oxy)-3-oxa-pentane, pentan-3-one and methyl-ammonium acetate in ethanol. The mol-ecule has mirror symmetry. The aza-14-crown-3 ether ring adopts abowlconformation stabilized by a weak intra-molecular C-H⋯O hydrogen bond. The conformation of the C-O-C-C-O-C-C-O-C polyether chain is t-g+-t-t-g--t (t =trans, 180°; g =gauche, ±60°). The dihedral angle between the benzene rings fused to the aza-14-crown-4-ether moiety is 72.68 (4)°. The piperidinone ring adopts achairconformation. The nitro-gen atom has a trigonal-pyramidal geometry, the sum of the bond angles being 335.9°. In the crystal, the mol-ecules are linked by weak C-H⋯O inter-actions, forming zigzag chains propagating along the [100] direction.
authors.affiliation: Institute of Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Vietnam; Graduate University of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Vietnam.
authors.forename: Van Tuyen
authors.initials: VT
authors.lastname: Nguyen
authors.affiliation: Department of Biotechnology, Vietnam-Russia Tropical Centre, 58 Nguyen Van Huyen, Hanoi, Vietnam.
authors.forename: Hong Hieu
authors.initials: HH
authors.lastname: Truong
authors.affiliation: Faculty of Chemistry, VNU University of Science, Vietnam National University, 19 Le Thanh Tong, Hoan Kiem, Hanoi, Vietnam.
authors.forename: Tuan Anh
authors.initials: TA
authors.lastname: Le
authors.affiliation: Organic Chemistry Department, Peoples' Friendship University of Russia, 6 Miklukho-Maklaya St., Moscow 117198, Russian Federation.
authors.forename: Anatoly T
authors.initials: AT
authors.lastname: Soldatenkov
authors.affiliation: Institute of Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Vietnam.
authors.forename: Tuyet Anh Dang
authors.initials: TA
authors.lastname: Thi
authors.affiliation: Faculty of Chemistry, VNU University of Science, Vietnam National University, 19 Le Thanh Tong, Hoan Kiem, Hanoi, Vietnam.
authors.forename: Thi Thanh Van
authors.initials: TT
authors.lastname: Tran
authors.affiliation: Inorganic Chemistry Department, Peoples' Friendship University of Russia, 6 Miklukho-Maklay St., Moscow 117198, Russian Federation.
authors.forename: Natalia Ya
authors.initials: NY
authors.lastname: Esina
authors.affiliation: Inorganic Chemistry Department, Peoples' Friendship University of Russia, 6 Miklukho-Maklay St., Moscow 117198, Russian Federation; X-Ray Structural Centre, A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov St., B-334, Moscow 119991, Russian Federation.
authors.forename: Victor N
authors.initials: VN
authors.lastname: Khrustalev
keywords: crown ethers; crystal structure; macroheterocycles; stacking inter­actions