title: Capped-porphyrin precursors.
abstract: In the crystalline state, 2-[3-(tosyloxy)propoxy]benzaldehyde [(I), C17H18O5S] exists in a U-shaped conformation. The benzaldehyde and toluene rings are nearly parallel. Crystals of 2-[2-(tosyloxy)ethoxy]-benzaldehyde occur with two habits. The X-ray structure determinations of these habits reveal an anhydrous form [(II), C16H16O5S] and a hemihydrated form [(III), C16H16O5S.0.5H2O]. In (III), a water molecule bridges two carbonyl functions [O6...O1 2.87 (1) A]. 1,2,4,5-Tetrakis{2-[2-(1,3-dioxolan-2-yl)-phenoxy]ethoxy} benzene [(IV), C50H54O16] was prepared by protecting the aldehyde function of (II) or (III) with ethylene glycol and reacting the resulting compound with 1,2,4,5-tetrahydroxybenzene. Compound (IV) has 1 symmetry.
authors.affiliation: Department of Chemistry, Northwestern University, Evanston, IL 60208-3113, USA.
authors.forename: P G
authors.initials: PG
authors.lastname: Jene
authors.forename: D S
authors.initials: DS
authors.lastname: Chan
authors.forename: B L
authors.initials: BL
authors.lastname: Cooke
authors.forename: J A
authors.initials: JA
authors.lastname: Ibers
mesh_terms: D003460:Crystallization; D018360:Crystallography, X-Ray; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D011166:Porphyrins / Q000737:chemistry*
chemical_list: D011166:Porphyrins