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排序方式: 共有56条查询结果,搜索用时 15 毫秒
1.
Pierfrancesco Bravo Calimero Ticozzi Beatrice Pelli Pietro Traldi 《Journal of heterocyclic chemistry》1988,25(2):685-688
The mass spectrometric behavior of 3-methyl-3-hydroxybenzoxocines has been studied in detail by means of linked scans and mass analyzed ion kinetic energy spectrometry. The structure of the molecular ion and the fragmentation processes are strictly related to the structure of the neutral moieties. The possible isomerization of 3-hydroxy-10-methoxy-3-methyl-3,4,5,6-tetrahydro-2H-[1]benzoxocine to 2-methyl-2-[3-(3′-methoxy-2′-hydroxy)phenyl]pentyloxirane and to 2-hydroxymethyl-9-methoxy-2-methyl-2,3,4,5-tetrahydro[1]benzoxepine is investigated. 相似文献
2.
2-Hydroxymethylchromans are the only products arising from the oxidation by m-chloro-perbenzoic acid of the β-(o-hydroxyphenyl) olefins VI, obtained in turn form 2-(o-hydroxy-phenyl) alkyl ketones (I) by the Wittig olefination with triphenylphosphonium methylide. 相似文献
3.
Valentina Marturano Francesco Abate Veronica Ambrogi Valeria Califano Pierfrancesco Cerruti Giovanni Piero Pepe Luciano R. M. Vicari Giovanni Ausanio 《Molecules (Basel, Switzerland)》2021,26(9)
Herein, smart coatings based on photo-responsive polymer nanocapsules (NC) and deposited by laser evaporation are presented. These systems combine remotely controllable release and high encapsulation efficiency of nanoparticles with the easy handling and safety of macroscopic substrates. In particular, azobenzene-based NC loaded with active molecules (thyme oil and coumarin 6) were deposited through Matrix-Assisted Pulsed Laser Evaporation (MAPLE) on flat inorganic (KBr) and organic (polyethylene, PE) and 3D (acrylate-based micro-needle array) substrates. SEM analyses highlighted the versatility and performance of MAPLE in the fabrication of the designed smart coatings. DLS analyses, performed on both MAPLE- and drop casting-deposited NC, demonstrated the remarkable adhesion achieved with MAPLE. Finally, thyme oil and coumarin 6 release experiments further demonstrated that MAPLE is a promising technique for the realization of photo-responsive coatings on various substrates. 相似文献
4.
Pierfrancesco Bravo Giovanni Fronza Calimero Ticozzi Giorgio Gaudiano 《Journal of organometallic chemistry》1974,74(1):143-154
Keto-stabilized sulphonium ylides displace styrene and benzonitrile from their adducts with PdCl2 to give stable ylidePdCl2 complexes. Evidence is given for epimeric equilibrium between trans square-planar structures of these new complexes in solution.A ylidePdI2 complex, obtained from dimethylsulphonium methylide, is also described. 相似文献
5.
The preparation and properties of new polynuclear carbonylhydrido complexes (NEt4)3[H4Re4(OCH3)(CO)16] (I) and (NEt4)2[H4Re4(CO)15] (II) are reported. Infrared and NMR spectra of these compounds are presented and discussed. The structure of compound II has been established by X-ray crystallographic analysis. 相似文献
6.
A. Romiti 《Mechanics Research Communications》1974,1(5-6):309-313
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The present research focuses the chemical aspect of entropy and exergy properties. This research represents the complement of a previous treatise already published and constitutes a set of concepts and definitions relating to the entropy–exergy relationship overarching thermal, chemical and mechanical aspects. The extended perspective here proposed aims at embracing physical and chemical disciplines, describing macroscopic or microscopic systems characterized in the domain of industrial engineering and biotechnologies. The definition of chemical exergy, based on the Carnot chemical cycle, is complementary to the definition of thermal exergy expressed by means of the Carnot thermal cycle. These properties further prove that the mechanical exergy is an additional contribution to the generalized exergy to be accounted for in any equilibrium or non-equilibrium phenomena. The objective is to evaluate all interactions between the internal system and external environment, as well as performances in energy transduction processes. 相似文献
10.
Lucarini S Bartolucci S Bedini A Gatti G Orlando P Piersanti G Spadoni G 《Organic & biomolecular chemistry》2012,10(2):305-313
An efficient and practical approach for the synthesis of all four stereoisomers of the MT(2) melatonin receptor ligand 4-phenyl-2-propionamidotetralin (4-P-PDOT), each in enantiomerically pure form (ee > 99.9%), was developed. The strategy involved an optical resolution procedure of the key precursor (±)-4-phenyl-2-tetralone with the unusual resolving agent (S)-mandelamide, through the formation of four dihydronaphtalene-spiro-oxazolidin-4-one diastereomers. Interestingly, NMR experimental observations in combination with geometric calculations, provided unambiguous configuration assignments of all stereocenters of the key spiro stereoisomers. Cleavage of each single spiro diastereomer under acidic conditions gave enantiopure (R)- or (S)-4-phenyl-2-tetralone, which were then converted to each 4-P-PDOT single enantiomer by using stereoselective reactions. 相似文献