- Cobalt(III) complexes of linear tetramines. III. Complexes of 4,7-diaza-1,10-decanediamine
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Cobalt(III) complexes of the new tetramine ligand, 4,7-diaza-1,10-decanediamine, NH2(CH2)3NH(CH2) 2NH(CH2)3NH2 (3,2,3-tet), have been prepared and characterized. One of these, trans-Co(3,2,3-tet)Cl2+, aquates in acidic solution with retention of topology to yield trans-Co(3,2,3-tet)(H2O)Cl2+: ΔH? = 24.5 kcal mol-1; ΔS? = +4 cal deg-1 mol-1. Carbonate ion reacts with trans-[Co(3,2,3-tet)Cl2]ClO4 in aqueous media to produce [Co(3,2,3-tet)CO3]ClO4. Unlike other carbonato(tetramine)cobalt(III) complexes, [Co(3,2,3-tet)CO3]ClO4 reacts with concentrated hydrochloric acid to yield trans-Co(3,2,3-tet)Cl2+ rather than a cis isomer.
- Alexander, M. Dale,Hamilton Jr., Hobart G.
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- Near-infrared photoswitching of cyclodextrin-guest complexes using lanthanide-doped LiYF4 upconversion nanoparticles
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This communication reports a new type of supramolecular cyclodextrin-guest complexes using cyclodextrin coated upconversion nanoparticles as hosts and monovalent and divalent azobenzenes and arylazopyrazoles as guests. A potentially biocompatible photocontrol of the interaction by isomerization of the azobenzene or arylazopyrazole was achieved by laser irradiation at 980 nm and a very low light intensity of 0.22 W cm-2
- M?ller, Nadja,Hellwig, Tim,Stricker, Lucas,Engel, Sabrina,Fallnich, Carsten,Ravoo, Bart Jan
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- BENZYLATED MANNICH BASE CURING AGENTS, COMPOSITIONS, AND METHODS
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Compositions and curing agents comprising a benzylated Mannich base composition. The benzylated Mannich base composition includes a reaction product of (a) a substituted phenolic compound having at least one substituent of formula (I): wherein R1 is each independently a linear or branched alkyl group having 1 to 4 carbon atoms, and R2 is hydrogen, methyl, ethyl or phenyl, with (b) a benzylated polyalkylene polyamine (II): wherein RA is substituted or unsubstituted benzyl; RB is each independently RA, or a hydrogen atom, or a group selected from C1-C16 linear, cyclic, and branched alkyl, alkenyl, and alkaryl groups; X, Y, and Z are independently selected from C2-C10 alkylene, and cycloalkylene groups; y is an integer from 0 to 7, and z is an integer from 0 to 4; and, optionally, (c) a multifunctional amine. Amine-epoxy compositions and articles produced from these compositions are also disclosed.
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Paragraph 0139; 0140
(2017/09/08)
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- Selective Manufacture of N,N'-BIS(Cyanoethyl)-1,2-Ethylenediamine and N, N'-BIS(3-aminopropyl)-1,2-Ethylenediamine
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A method for making N,N′-bis(3-aminopropyl)-1,2-ethylenediamine which comprises reacting acrylonitrile and ethylenediamine in about a 2:1 molar ratio to make a N,N′-bis(cyanoethyl)-1,2-ethylenediamine reaction product and hydrogenating the reaction product, the improvement for improving the selectivity of the reactions to N,N′-bis(2-cyanoethyl)-ethylenediamine and to N,N′-bis(3-aminopropyl)-1,2-ethylenediamine which comprises reacting acrylonitrile and ethylenediamine in the presence of 2-30 wt % water, based on total reactants.
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Page/Page column 3-4
(2008/12/07)
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- Phenylglyoxal for polyamines modification and cyclam synthesis
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The bis-aminals obtained by tetraamine and phenylglyoxal condensation display various behaviours such as equilibrium between different configurations, rearrangements that lead to lactam derivatives, or amine deprotection. Our investigations about them were focused on three different linear amines, and then extended to polyazacycloalkanes cyclen and cyclam. Cyclam was also synthesised with the bis-aminals issued from condensation of linear polyamines with phenylglyoxal. The lactam derivatives described here were moreover, employed for the mono-N-functionalisation of tetraamines by phenyl-acetic acid group.
- Tripier, Rapha?l,Chuburu, Fran?oise,Le Baccon, Michel,Handel, Henri
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p. 4573 - 4579
(2007/10/03)
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- 4-Formyl amino-n-methylpiperidine derivatives, the use thereof as stabilisers and organic material stabilised therewith
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The present invention relates to 4-formylamino-N-methylpiperidine derivatives of the formula (I) where the variables are as defined in the Description, to a process for preparing these piperidine derivatives, to the use of these piperidine derivatives of the invention, or prepared according to the invention, for stabilizing organic material, in particular for stabilizing plastics or coating materials, and also to the use of these piperidine derivatives of the invention, or prepared according to the invention, as light stabilizers or stabilizers for wood surfaces. The present invention further relates to stabilized organic material which comprises these piperidine derivatives of the invention or prepared according to the invention.
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- Chemoenzymatic syntheses of polyamines and tetraazamacrocycles
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Syntheses of different open chain polyamines starting from enzymatically prepared bis(amidoesters) are described. Some of these polyamines are also used as precursors in the syntheses of tetraazamacrocycles. This methodology can also be applied to the synthesis of chiral compounds.
- Rubio, Mercedes,Astorga, Covadonga,Alfonso, Ignacio,Rebolledo, Francisca,Gotor, Vicente
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p. 2441 - 2452
(2007/10/03)
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- Hydroxy-substituted N-alkoxy hindered amines and compositions stabilized therewith
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Hindered amines substituted on the N-atom with an —O—E—OH moiety are particularly effective in stabilizing polyolefin and automotive coating compositions against the deleterious effects of oxidative, thermal and actinic radiation where the presence of the OH group on the compounds adds important properties not attainable by the use of normal —O—E moieties.
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- Hydroxy-substituted N-alkoxy hindered amines and compositions stabilized therewith
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Hindered amines substituted on the N-atom with an —O—E—OH moiety are particularly effective in stabilizing polyolefin and automotive coating compositions against the deleterious effects of oxidative, thermal and actinic radiation where the presence of the OH group on the compounds adds important properties not attainable by the use of normal —O—E moieties.
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- Structural requirements of analogues of polyamines for migration and growth of IEC-6 cells
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Healing of gastrointestinal mucosal lesions occurs through two processes: an early one involving cell migration and a later one in which cell division replaces lost cells. Both processes require the presence of polyamines, but the mechanism of action of these compounds is unknown. In the present study, we examined the ability of analogues of spermidine and spermine to support migration and growth of IEC-6 cells that have been grown in α- difluoromethylornithine to inhibit polyamines. All analogues of spermidine with the general formula x-3 (referring to the numbers of carbon atoms on either side of the central nitrogen), where x = 2-12, competed with spermidine for entry into the cells. However, in addition to spermidine (x = 4), only compounds for which x = 2, 3, or 6 supported migration and only those for which x = 2 or 7 supported growth. Spermine analogues 3-x-3, for which x = 3, 6, 9, or 12, competed for entry into the cells, but only compounds for which x = 3 or 6 supported migration and only the compound for which x = 3, in addition to spermine (x = 4), supported growth. In addition, analogues 2-3-2, 3-2-3, and 2-(3)2, a branched compound, supported both migration and growth but entered the cell via a mechanism different than that for spermidine and spermine. These data define some of the specific structural requirements for polyamines to produce their physiological effects.
- McCormack, Shirley A.,Zimmerman, Barbara J.,Israel, Mervyn,Blanner, Patrick,Johnson, Leonard R.
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p. 724 - 729
(2007/10/03)
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- Reactions of (10-Methyl-10-nitro-1,4,8,12-tetraazacyclopentadecane)copper(II) Ion in Aqueous Hydrochloric Acid, Including Zinc Reduction. Crystal Structure of (2-Methyl-1,4,8,11-tetraazacyclotetradec-1ene)copper(II) Perchlorate
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The zinc/aqueous hydrochloric acid reduction of (10-methyl-10-nitro-1,4,8,12-tetraazacyclopentadecane)copper(II) ion, 2+, yields the hydrochloride salts of the expected 10-methyl-1,4,8,12-tetraazacyclopentadecan-10-amine (5) and also 14-amino-4,8,11-triazatetradecan-2-one (4) in approximately 2:1 ratio.Reaction of (10-methyl-10-nitro-1,4,8,12-tetraazacyclopentadecane)copper(II) ion in aqueous hydrochloric acid alone leads to bond scission and hydrolysis adjacent to the nitro-substituted carbon of the macrocycle to form 15-nitro-2,6,9,13-tetraazahexadecan-1-ol (7), which may be reduced in zinc/acid to the 15-amino-2,6,9,13-tetraazahexadecan-1-ol molecule (8).The acid hydrolysis reaction is not simply reversed by addition of base.The ring-opened species (7) is apparently an intermediate in formation of (4) from (3), via a metal catalysed Nef reaction which converts the CH(NO2)CH3 arm into CO(CH3).Reaction of (7) with Cu2+ at pH 9.5 slowly forms (2-methyl-1,4,8,11-tetraazacyclotetradec-1-ene)copper(II), >2+, via formation of (4) and an intramolecular condensation around the metal ion.This complex was characterized by an X-ray crystal structure analysis of the perchlorate salt.
- Lawrance, Geoffrey A.,O'Leary, Margaret A.,Skelton, Brian W.,Woon, Fong-Ha,White, Allan H.
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p. 1533 - 1544
(2007/10/02)
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