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21.
Zn(bipy)3Cl2, Fe(bipy)Cl3, and Fe(tpp)Cl are effective catalysts for silylation of hydroxy groups with HMDS at room temperature in dry CH3CN. High selectivity is observed between primary and secondary hydroxy functional groups. This method absolutely discriminates other functional groups containing labile hydrogen atoms. 相似文献
22.
Tetrakis(pyridine)silver dichromate is prepared and used for the oxidation of benzylic and allylic alcohols in refluxing benzene in high yields. 相似文献
23.
A simple, efficient, regioselective, and solvent‐free method has been developed for the synthesis of β‐hydroxyphosphonates from epoxides and triethyl phosphite using ZnCl2 in high yields under mild conditions. 相似文献
24.
In the present work, the preparation of 1-amidoalkyl-2-naphthols via one-pot three-component condensation of amides, aldehydes, and β-naphthol in the presence of catalytic amounts of zirconyl triflate, as a highly efficient, low toxic, stable and non-hygroscopic catalyst under solvent-free conditions is reported. This low-cost procedure offers several other advantages such as short reaction times and good to excellent yields. 相似文献
25.
Oxidation of thiophenols, benzyl thiol, and alkyl thiols with bis [trinitratocerium (IV)] chromate and pyridinum chlorochromate are investigated. Pyridinum chlorochromate is quite ineffective for the oxidative dimerization of alkyl thiols. 相似文献
26.
Bis(2,2'-bipyridyl)copper(II) permanganate (BBCP): A mild and versatile oxidant in organic synthesis
The preparation of bis(2,2'-bipyridyl)copper(II) permanganate (BBCP) is described. The reagent converts alcohols to the corresponding carbonyl compounds, α-hydroxy ketones to diketones, hydroquinone to p-benzoquinone, and compounds with benzylic double bonds to benzaldehyde in high yield. Benzophenone oxime, acetophenone oxime and various benzaldoximes are converted to the corresponding carbonyl compounds, aromatic amines to azo compounds, and benzylamine to benzaldehyde, usually in high yields, under mild condition. 相似文献
27.
Bichenkova EV Gbaj A Walsh L Savage HE Rogert C Sardarian AR Etchells LL Douglas KT 《Organic & biomolecular chemistry》2007,5(7):1039-1051
This research describes the effects of structural variation and medium effects for the novel split-oligonucleotide (tandem) probe systems for exciplex-based fluorescence detection of DNA. In this approach the detection system is split at a molecular level into signal-silent components, which must be assembled correctly into a specific 3-dimensional structure to ensure close proximity of the exciplex partners and the consequent exciplex fluorescence emission on excitation. The model system consists of two 8-mer oligonucleotides, complementary to adjacent sites of a 16-mer DNA target. Each probe oligonucleotide is equipped with functions able to form an exciplex on correct, contiguous hybridization. This study investigates the influence of a number of structural aspects (i.e. chemical structure and composition of exciplex partners, length and structure of linker groups, locations of exciplex partner attachment, as well as effects of media) on the performance of DNA-mounted exciplex systems. The extremely rigorous structural demands for exciplex formation and emission required careful structural design of linkers and partners for exciplex formation, which are here described. Certain organic solvents (especially trifluoroethanol) specifically favour emission of the DNA-mounted exciplexes, probably the net result of the particular duplex structure and specific solvation of the exciplex partners. The exciplexes formed emitted at approximately 480 nm with large Stokes shifts ( approximately 130-140 nm). Comparative studies with pyrene excimer systems were also carried out. 相似文献
28.
Saeed Bahadori Khalili Ali Reza Sardarian 《Monatshefte für Chemie / Chemical Monthly》2012,14(2):841-846