Novel fluorescent quater‐ and quinquifurans: Syntheses and photophysical properties
作者:Joel M. Kauffman、Guillermo Moyna
DOI:10.1002/jhet.5570390519
日期:2002.9
In the quest for fast fluors for use in waveshifting polystyrene fibers, symmetrical oligofurans were investigated. Furan moieties were coupled by means of the Ullmann Reaction or by palladium-catalyzed unsym-metrical coupling; the latter gave higher yields. While the benzoxazole-terminated quater- and quinquifurans we prepared were both stable and fast, exhibiting a green fluorescence and decay times
Sulfonamidophenols, metal complexes thereof, and solutions containing
申请人:Henkel Corporation
公开号:US04239699A1
公开(公告)日:1980-12-16
Certain sulfonamidophenols, metal complexes thereof and solutions of said compounds in essentially water-immiscible, liquid hydrocarbon solvents are disclosed. The sulfonamidophenols have the structural formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are as defined in the specification and claims hereof. Particular metal values are recovered from their aqueous solutions by using sulfonamidophenols dissolved in essentially water-immiscible liquid hydrocarbon solvents. The extraction process involves contacting the metal value containing aqueous solution with the solution of sulfonamidophenol in essentially water-immiscible liquid hydrocarbon solvent and stripping the metal values from the loaded organic phase.
Certain benzoxazoles and the use thereof as metal extractants
申请人:General Mills Chemicals, Inc.
公开号:US04020081A1
公开(公告)日:1977-04-26
Benzoxazoles having the structure ##STR1## where R is hydrogen or an alkyl group having from 1 to 20 carbon atoms, R' is hydrogen, chlorine or an alkyl group containing from 1 to 20 carbon atoms, X is H or Chlorine and the total number of carbon atoms in R and R' is 6 to 40 with the proviso that one of R and R' must be an alkyl group of at least 6 carbon atoms. The benzoxazoles are useful in a process of recovering metal values, particularly copper and nickel, from aqueous solutions thereof.
A polar globular mesogen: synthesis of a tetrasubstituted tribenzosilatrane
作者:Corinne Soulié、Patrick Bassoul、Jacques Simon
DOI:10.1039/c39930000114
日期:——
A tribenzosilatrane substituted with four alkyl tails has been synthesized in eight steps starting from p-alkylaniline with an overall yield of approximately 10%; this molecular unit is designed for fabricating a new type of material where the overall globular shape can facilitate the obtainment of cubic symmetry mesophases; the use of different side chains could also yield macrochiral centres.
Alkyl-substituted 2,2'-(1,4-naphthalenediyl)dibenzoxazole and
申请人:Mitsubishi Paper Mills Limited
公开号:US05213888A1
公开(公告)日:1993-05-25
A resin coated sheet type photographic support which is made up of a support, which is coated on both sides with a polyolefin resin. On the image forming side, the resin contains a titanium dioxide pigment and a fluorescent agent of an alkyl-substituted 2,2'-(1,4-naphthalenediyl)-dibenzoxazole represented by the structural formula [I]: ##STR1## wherein R' and R" are independently alkyl groups having 9-20 carbon atoms, m and n are independently 0 or positive integers and m+n=1-4. The photographic support has bright whiteness and does not cause color change or bleeding out.