摘要:

AbstractA number of adducts of general formula Cu(PZ)x2+(anion)2−is reported. In this formula PZ stands for: pyrazole.N‐methyl pyrazole. 3(5)‐methylpyrazole. 3,5‐dimethylpyrazole. 4‐chloropyrazole, 4‐bromopyrazole and 4‐nitropyrazole; the anions are ClO4−, BF4−, NO3−. Br−and Cl−. The value ofxvaries from 2–4 for the several ligands and anions.The compounds are synthesized from the hydrated Cu(II) salts and the stoichiometric amounts of pyrazoles in ethanol or acetone solutions, with the addition of triethyl orthoformate for dehydration.The adducts were characterized and identified by chemical analyses, infrared spectra, ligand‐field spectra and paramagnetic measurements. In all compounds the Cu2+ions were found to be in a six‐coordinate, distorted octahedral environment. In contrast with other divalent metal ions, solvates containing the unit C

ISSN:0165-0513    

DOI:10.1002/recl.19710900302

出版商:WILEY‐VCH Verlag    

年代:1971

数据来源: WILEY

摘要:

AbstractIn order to find characteristic differences between symmetrically and unsymmetrically bondedN,N‐dialkyldithiocarbamates, their IR and1H NMR spectra have been examined. The IR data firmly underline a previously reported infrared criterion which makes it possible to distinguish the two types of bonding. In the spectra of the unsymmetricalN,N‐diethyldithiocarbamates a band at 1000 cm−1is assigned to the CS stretching mode.Although the rotation around the S2C‐NR2, bond in several dithiocarbamato complexes will be strongly hindered at low temperatures, no splitting of the NMR signals of theN‐alkyl groups could be observed. This may be attributed to an extremely small difference in magnetic environment of theN‐alkyl moieties in

ISSN:0165-0513    

DOI:10.1002/recl.19710900303

出版商:WILEY‐VCH Verlag    

年代:1971

数据来源: WILEY

摘要:

AbstractTwenty‐three new coordination compounds are reported with butanone, acetophenone and chloroacetone as the ligands, viz. M(C2H5COCH3)6(InCl4)2, M(C6H5COCH3)6(InCl4)2, M(ClCH2COCH3)6(InCl4)2and M(CICH2COCH3)6‐(FeCl4)2where M is Mg, Mn, Fe, Co, Ni, and Zn.In the complexes the carbonyl stretching vibration is shifted to lower frequencies with regard to this vibration in the free ligands, the magnitudes of the shifts are metal‐dependent in the Irving‐Williams order. Other ligand vibrations also shift on complexing.The presence of octahedral species M(O)62+in the solid compounds was indicated by the ligand field spectra of the Fe(II), Co(II) and Ni(II) compounds. Values of Dq and B for the Co(II) and Ni(II) compounds are r

ISSN:0165-0513    

DOI:10.1002/recl.19710900304

出版商:WILEY‐VCH Verlag    

年代:1971

数据来源: WILEY

摘要:

AbstractN,NDimethylaminoacetylene. HC  CN(CH3)2has been obtained in about 55% yield by elimination of thiol from the ketene‐N,S‐acetal H2CC (SC4H9)‐(N(CH3)2). The latter compound was synthesized by converting CH3C (O)N‐(CH3)2into the corresponding thioamide (94% yield) and treating the anion of the thioamide (generated by means of potassium amide) with butyl brom

ISSN:0165-0513    

DOI:10.1002/recl.19710900305

出版商:WILEY‐VCH Verlag    

年代:1971

数据来源: WILEY

摘要:

AbstractSpectroscopic results are communicated for the solids In4Cl7, In2Cl3, InCl3(C4H9)4NCl and InCl3· 2[C4H9)4NCl]

ISSN:0165-0513    

DOI:10.1002/recl.19710900306

出版商:WILEY‐VCH Verlag    

年代:1971

数据来源: WILEY

摘要:

AbstractThe thermal behaviour of copper selenides up to about 400°C has been studied by X‐ray diffraction at continuously variable temperature and by differential.The thermal behaviour of copper selenides up to about 400°C has been studied orthorhombic (pseudo‐rhombohedral) witha= 4.118,b= 2 × 7.032,c= 20.381 Å at 20°. The homogeneity range of the f.c.c. phase Cu2‐xSe was found as 0.15 ≤ × ≤ 0.20 at 20°; the atomic arrangement in Cu1,80Se was determined. A superstructure of this phase is found below − 115°. CuSe is hexagonal (CuS‐type) above 120° (a= 3.976.c= 17.243 Å at 140°), orthorhombic between 120° and about 50° (a= 3.949.b= 6.935,c= 17.20 Å at 60°), and has a hexagonal superstructure at lower temperatures (a= 14.20.c= 17.26 Å at 20°). The literature data on

ISSN:0165-0513    

DOI:10.1002/recl.19710900307

出版商:WILEY‐VCH Verlag    

年代:1971

数据来源: WILEY

摘要:

Abstractα‐Alkylidenimino‐carboxylic esters can be prepared in 60‐95% yield by condensation of α‐aminocarboxylic esters with aldehydes. In the presence of ammonia these condensation products undergo an intramolecular cyclisation to give 2,5‐substituted 4‐imidazolidinones in

ISSN:0165-0513    

DOI:10.1002/recl.19710900308

出版商:WILEY‐VCH Verlag    

年代:1971

数据来源: WILEY

摘要:

AbstractBuffer solutions of organic acids in various methanol‐water and ethanol‐water mixtures have been measured with cells I and II:Contrary to the generally held opinion, the liquid‐junction potential of cell I is clearly dependent on the solutes in the mixed solvent with higher percentages of organic solvent. The consequences of this for the determination of dissociation constants in mixed solvents with cell I are disc

ISSN:0165-0513    

DOI:10.1002/recl.19710900309

出版商:WILEY‐VCH Verlag    

年代:1971

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19710900310

出版商:WILEY‐VCH Verlag    

年代:1971

数据来源: WILEY

摘要:

AbstractInteraction of π‐allylpalladium halides with conjugated dienes leads to new π‐allylpalladium complexes via addition of the allyl fragment to the diene molecule. We succeeded in isolating the intermediate complexes in high yield and determining their structures. With conjugated dienes the addition takes place at the most substituted carbon atom in the π‐allyl fragment, contrary to what happens in the reaction with CO and allene. Substituents in the π‐allyl group and the other ligands bound to the metal prove to have a strong influence on the rate. For the bridging ligand the rate decreases in the order Cl>Br>CNS>I. For α‐or β‐substituted π‐allyl the order is Cl>COOR>>H>CH3. In combination with a kinetic investigation, the present study has provided a mechanism which accounts for the stereospecificity of the reaction and the accelerating influence of electron‐withdrawing groups.The results demonstrate the importance of π‐allyl transition‐metal intermediates in e.g. oligo‐ and polymerization of dienes. Repetition of the above‐described process leads with π‐allyl‐palladium halides to low‐mole

ISSN:0165-0513    

DOI:10.1002/recl.19710900311

出版商:WILEY‐VCH Verlag    

年代:1971

数据来源: WILEY