共查询到20条相似文献,搜索用时 31 毫秒
1.
A.V. Fokin 《Journal of fluorine chemistry》1980,16(6):565-566
Chlorine fluorosulfonate adds exceptionally easy not only to various alkenes, perfluorobenzene, but to alkynes too The addition of peroxydisulfuryldifluoride to alkyl- and perfluoroalkyliodides leads to unstable adducts, which decompose with the formation of alkylfluorosulfonates and iodine fluorosulfonate; the latter was trapped with fluoroalkenes The use of ClOSO2F allows to substitute selectively for the fluorosulfonate group the chlorine atom in monochloroacetic acid esters as well as the fluorine atom in hexafluoroacetone N-fluoroimine ClOSO2F serves as an exceptionally active chlorinating reagent for fluorinated alcohols, nitrosocompounds, perfluoroacid amides and particularly for benzene The reaction of (OSO2F)2 with perfluoroacid amides leads to the corresponding N,N-bis(fluorosulfonate)amides, which easily rearrange into alkylfluorosulfonates The hypochlorites of fluorinated alcohols are stable enough and they, similarly to ClOSO2F, are able to add to alkenes, fluoroalkenes (but not to perfluoroisobutylene), bis(trifluoromethyl)ketene, trifluoromethylisocyanate and perfluoronitriles The fluorosulfonatoacetic acid esters are unstable at the ambient temperature, but they can be widely used in situ as a very effective alkylating reagents 相似文献
2.
J.W.F.L. Seetz F.A. Hartog H.P. Böhm C. Blomberg O.S. Akkerman F. Bickelhaupt 《Tetrahedron letters》1982,23(14):1497-1500
Careful addition of 1,3-dibromopropane to magnesium in Et2O yields 1,3-bis(bromomagnesio)propane which is purified via “magnesacyclobutane” . Reactions of with H2O, CO2, HgBr2 and Me3SnCl are reported. MgBr2 catalyses the decomposition of to allylmagnesium bromide . 相似文献
3.
The cyclometallated monohydrides (R H or Me) react with NaOPri/PriOH/H2 to give fluxional tetrahydrides, probably . These are highly fluxional having magnetically equivalent hydridic hydrogens, even at ---100°C. When treated with HBr, , gives and with CO it gives a mixture of complexes which are probably (2 isomers) and . When treated with ButNC this tetrahydride undergoes similar reactions but another (major) product is formed which appears to be binuclear and fluxional and is probably of type , with four bridging hydrogens. 相似文献
4.
François Mathey 《Tetrahedron letters》1979,20(20):1753-1756
1-Benzyl-3,4-dimethylphosphate - is converted into 2-phenyl-4,5-dimethyl-λ3-phosphorin - through 1,2-dihydro-λ5-phosphorines and . 相似文献
5.
Kimiak Yamamura Kazumi Nakatsu Kenji Nakao Tomoo Nakazawa Ichiro Murata 《Tetrahedron letters》1979,20(52):4999-5002
A series of o-tropyliobiphenyl tetradfluoroborates has been synthesized. Evidences are presented to show that exhibit strong intramolecular charge-transfer interaction between tropylium ion and remote aryl ring. The structure of was determined by single crystal X-ray diffraction study. 相似文献
6.
Philippe Fornier de Violet Roland Bonneau Jacques Joussot-Dubien 《Chemical physics letters》1974,28(4):569-572
The laser flash photolysis of iodine-iodide mixtures in alcoholic solvents produces transient species absorbing in the red and near infrared region with maxima at 740 and 590 nm. The 740 nm absorption band has already been attributed to the well known I ion. In this work the 590 nm absorption band is assigned to the I radical anion which presumably could be formed by the equilibrium reaction: I + I3- ? I. The variations of the intensities of the 590 and 740 nm transient absorption bands as a function of I3? concentration, temperature and solvent, support this assignment. The kinetics of formation of I and I has been studied in solutions of tertiary butanol. An analysis of the experimental results shows that the I ion could be formed via a mechanism involving an I intermediate. 相似文献
7.
J. Carre M. Kollmannsberger J. Thourey G. Perachon J. Bousquet 《Journal of fluorine chemistry》1976,8(5):401-408
The standard enthalpy of formation of tellurium tetrafluoride has been determined: by combustion in fluorine: by reaction in a normal solution of soda: 相似文献
8.
Nikolai S. Zefirov A.S. Kozmin V.V. Zhdankin V.N. Kirin I.V. Bodrikov B.B. Sedov V.G. Rau 《Tetrahedron letters》1979,20(37):3533-3536
“doping-addition” of 2-NO2C6H4SCl to the tricyclo[4,2,2,02,5]deca-3,7,9-triene system occurs to give unusual products: (i) rearranged caged cyclopropane and (ii) the stable cross-perchlorate . 相似文献
9.
J.A. Connor 《Journal of organometallic chemistry》1978,144(3):C58-C62
The formation of newintermediates and especially germaimines R2GeNR′ has been observed in the reaction of germylenes with phenyl azide (precursor of phenylnitrene). These transient derivatives lead, by polycondensation reactions, to the corresponding cyclic or linear germazanes , and are characterized by insertion reactions into the germanium—nitrogen bond, cleavage and addition reaction with tetrahydrofuran, and pseudo-Wittig reactions with benzaldehyde. The latter produces the corresponding germoxanes via new intermediates and phenyl benzaldimine. 相似文献
10.
Product study and kinetic data of the solvolysis of the bridgehead chlorides () and ( indicate the neighboring group participation of the strained bridgehead double bonds. 相似文献
11.
Interaction of a compound of the type with sodium hydride results in the formation of the Na salt of the carbanion (where ArF represents a polyfluorinated group), which can enter into an intramolecular nucleophilic substitution reaction with the formation of the corresponding polyfluorinated carbocyclic compound. This reaction may serve as a general method for producing such compounds. 相似文献
12.
J.P. Hindermann R. Kieffer A. Kiennehann R. El Bacha M. Primet A. Deluzarche 《Tetrahedron letters》1981,22(40):3969-3972
The application of chemical trapping to chemisorbed CO has led to the characterization of multibonded species on Ni/SiO2, Ni/Al2 O3 , Co, Co/Al2O3 and of a bridged form on Pd/SiO2. A structure like [proposed by Muetterties) is in good agreement with infrared and magnetic studies of CO chemisorption on Ni/SiO2. 相似文献
13.
Reduction of α,β-unsaturated iminium salts by 3,5-dicarbethoxy-2,6-dimethyl-1,4-dihydropyridine results in or (primary) reduction products, depending on the basicity of the amine component. 相似文献
14.
Di-t-butylzinc adds easily to conjugated enynes . Only the acetylenic bond is involved in this reaction which proceeds via trans-addition. This regioselective and stereoselective addition leads to conjugated dienes . 相似文献
15.
The stereoselective fluorination of four couples of diastereoisomeric 2-alkyl 3-hydroxy 3-phenylpropanoic methyl esters by the reaction of the phenyltetrafluorophosphorane with the corresponding trimethylsilylethers derivatives is described. The structure of the 2-alkyl 3-fluoro 3-phenyl propanoic methyl esters obtained quantitativly has been determined unambiguously by NMR analysis. 19F NMR results permit us to determine the relative populations of the rotamers for each of the isomers threo and erythro. 相似文献
16.
Ring opening of the glycidonitriles (II a–e) by HF/pyridine leads to the fluorocyanohydrins (III a–e). Treatment of the fluorocyanohydrins with ammonia in anhydrous methanol gives the α-amino-β-fluoronitriles (IV a–e) which upon acidic hydrol sis afford the β-fluoro-α-aminoacids (V a–e) in good overall yield. 相似文献
17.
Egon Fahr Monika J. Richter Wolfgang Schmitt-Sody Rainer Elbert 《Tetrahedron letters》1980,21(34):3269-3272
Amino-azimines of type (1) react at room temperature with bases (ammonia, aliphatic amines, hydrazine and methyl-hydrazine, aqueous/ethanolic sodium hydroxide) by cleavage of the to the and the NNN moieties (azide). 相似文献
18.
In the reaction of CF3SOCl with NaN3 or (CH3)3SiN3, azide, CF3SON3 (I) is formed: Upon gentle warming to room temperature, (I) decomposes under evolution of N2 to give CF3SON (II), which however oligomerizes instantaneously, The monomeric nitride(II) can be captured in the presence of reactive halogene compounds to yield N-substituted trifluoromethan-imino sulfonyl chlorides. With CH3CN, a six-membered ring compound is obtained: 相似文献
19.
The thermal decomposition of keto-ylides resulting from the reaction of m - and p-acetoxy benzoyl chlorides with Ph3P=CH-COOMe leads, after saponification to m- and p-phenylpropiolic acid respectively. Ortho substitution by an acyl group generally changes the orientation of the reaction Thus o.-acetoxy-. benzoyloxy- or phenylacetoxy benzoyl chlorides respectively afford:andin satisfactory yields. Saponification of the first and second ones gives:This constitutes a new, convenient route to 3-acyl 4-hydroxy cumarins and 11-hydroxy 12 H -benzo (b) xanthene 12-one. Formation of these last products involves the carbonyl oftheacyloxy-substituent and not of the acyl chloride as previously observed in these series. 相似文献
20.
The reaction of Mes-PCl2 with several amines gives new compounds, oligomers of Mes-P=N-R. Chemical properties of these oligomers are investigated: action of alcohols and disubstituted amines (XH) gives , the formation of which are only consistent with the presence of a dicoordinated phosphorus compound, Mes-P=N-R, in equilibrium with a tetramer 相似文献