Photochemistry of the Phthalimide System, 43. Application of Remote Photocyclization with a Pair System of Phthalimide and Methylthio Groups. A Photochemical Synthesis of Cyclic Peptide Models.
Application of regioselective remote photocyclization of a pair system consisting of a phthalimide group and a methylthio group to a homologous series of N-substituted phthalimides (4 and 5) possessing a terminal sulfide function in the amide side chain was investigated. On irradiation, medium to large membered cyclic peptide-like compunds (6, 7 and 9), up to a thirty-eight membered ring product (6f), were synthesized in moderate yields.
An ink composition comprised of a colorant and a reversible crosslinked component vehicle obtained from the reaction product of an anhydride and an organoamine, and which ink possesses a viscosity of from about 1 mPa.s (centipoise) to about 25 mPa.s (centipoise) at a temperature of from about 125°C to about 185°C. The ink compositions are particularly suitable for use in acoustic ink jet printing.
[EN] TOUGH, HIGH PERFORMANCE, ADDITION-TYPE THERMOPLASTIC POLYMERS
申请人:UNITED STATES GOVERNMENT, as represented by THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
公开号:WO1990003405A1
公开(公告)日:1990-04-05
(EN) A tough, high performance polyimide is provided by reacting a triple bond conjugated with an aromatic ring in a bisethynyl compound with the active double bond in a compound containing a double bond activated toward the formation of a Diels-Adler type adduct, especially a bismaleimide, a biscitraconimide, or a benzoquinone, or mixtures thereof. Addition curing of this product produces a highly linear polymeric structure and heat treating the highly linear polymeric structure poduces a thermally-stable aromatic addition-type thermoplastic polyimide, which finds utility in the preparation of molding compounds, adhesive compositions, and polymer matrix composites.(FR) On obtient un polyimide résistant et très performant en faisant réagir une triple liaison, conjuguée à un noyau aromatique dans un composé de biséthynyle, avec la double liaison active dans un composé renfermant une double liaison activée en vue de la formation d'un produit d'addition du type Diels-Adler, notamment un bismaléimide, un biscitraconimide, ou un benzoquinone, ou bien des mélanges de ceux-ci. Le durcissement d'addition de ce produit donne une structure polymérique fortement linéaire et le traitement thermique de ladite structure donne un polyimide thermoplastique aromatique d'addition thermiquement stable, qui est utile dans la préparation de composés de moulage, compositions adhésives, et composites à matrice polymère.
Light-responsive peptide [2]rotaxanes as gatekeepers of mechanised nanocontainers
Novel mechanized silica nanoparticles incorporating a peptide-basedmolecularshuttle as a photo-responsive interlocked gatekeeper of nanocontainers are described including the uptake and delivery studies of a model cargo.