摘要:

AbstractTheo‐substituted hybrid phenylphosphines, PPh2(o‐C6H4NH2) and PPh2(o‐C6H4OH), could be deprotonated with LDA orn‐BuLi to yield PPh2(o‐C6H4NHLi) and PPh2(o‐C6H4OLi), respectively. When added to a solution of (η5‐C5H5)Fe(CO)2I at room temperature, these two lithiated reagents produce a chelated neutral complex 1 (η5‐C5H5)Fe(CO)[C(O)NH(o‐C6H4)PPh2‐C,P‐η2] for the former and mainly a zwitterionic complex2, (η5‐C5H5)Fe+(CO)2[PPh2(o‐C6H4O−)] for the latter. Complex1could easily be protonated and then decarbonylated to give4[(η5‐C5H5)Fe(CO){NH2(o‐C6H4)PPh2‐N,P‐η2}+]. Complexes1and4‐Ihave been crystallograph

ISSN:0009-4536    

DOI:10.1002/jccs.200100120

出版商:WILEY‐VCH Verlag    

年代:2001

数据来源: WILEY

摘要:

AbstractRate constants directly measured from the GC‐analyzed method for SmI2reduction of ethylt‐cinnamate and its substituted derivatives in the presence of HMPA andt‐butanol were obtained. HMPA exhibits a stronger catalytic effect thant‐butanol. Dependence of reaction rates on concentration of SmI2and temperature were studied. Electron‐donating groups retard this reduction; the electron‐withdrawing groups, on the other hand, enhance the reaction rates d

ISSN:0009-4536    

DOI:10.1002/jccs.200100121

出版商:WILEY‐VCH Verlag    

年代:2001

数据来源: WILEY

摘要:

AbstractFe(CN)5ampy3−(ampy = 4‐aminopyridine) complex was unstable at pH ≤ 4 with respect to the dissociation due to the protonations of the complex. The first protonation on the 4‐aminopyridine ligand at pKa= 3.2 resulted in a ≅ 150‐fold in crease in rate of dissociation as compared to that of the complex in the neutral solution. However, further protonation of the complex on the cyanide ligand at pKa= 1.5 in creased the rate only slightly. The large in crease in the rate constant of dissociation for Fe(CN)5ampyH2−complex suggests that in the transition state the proton is likely shifted from the amino group and becomes coordinated to a pair of dπ electrons directed at the face of the coordina

ISSN:0009-4536    

DOI:10.1002/jccs.200100122

出版商:WILEY‐VCH Verlag    

年代:2001

数据来源: WILEY

摘要:

AbstractThe tris(triphenylphosphine)copper and tris(triphenylphosphine)silver complexes of phenalenone4, diphenylcyclopropenone5and tropone6were prepared by treating tris(triphenylphosphine)copper tetrafloroborate2and tris(triphenylphosphine)silver tetrafluoroborate3with basic ketones4, 5and6in high yields. All these complexes are stable in either air or moisture, and soluble in common organic solvents such as dichloromethane and chloroform.

ISSN:0009-4536    

DOI:10.1002/jccs.200100123

出版商:WILEY‐VCH Verlag    

年代:2001

数据来源: WILEY

摘要:

AbstractThe present paper discusses the effect of the geometrical structure of the electric fieldon the corrosion of aluminum cathodes by electrolysis of aqueous solutions of sodium chloride. A correlation between the mass of the aluminum dissolved from the cathode and the factors electric current density, distance between the electrodes, electrolysis time and sodium chloride concentration by electrolysis with direct current in electric fields of various geometries was found.

ISSN:0009-4536    

DOI:10.1002/jccs.200100124

出版商:WILEY‐VCH Verlag    

年代:2001

数据来源: WILEY

摘要:

AbstractThe mass spectra of a series ofN‐aryl α,β‐unsaturated γ‐lactams were studied. Besides the molecular ion, the three characteristic fragments such as [M+‐29], [M+‐55], and [M+‐82] were commonly found in a series ofN‐Aryl α,β‐unsaturated γ‐lactams in EI/MS. Further more the mechanism for the interpretation of these fragm

ISSN:0009-4536    

DOI:10.1002/jccs.200100125

出版商:WILEY‐VCH Verlag    

年代:2001

数据来源: WILEY

摘要:

AbstractSemihydrogenation of α,β‐unsaturated ynoates and ‐ynones bearing a γ‐alkoxy group can be performed using triphenylphosphine and water. α,β‐Unsaturated ynoates were reduced to a mixture ofcisandtransα,β‐unsaturated enoates, whereas, ynones were reduced totransα,β‐unsaturated enones

ISSN:0009-4536    

DOI:10.1002/jccs.200100126

出版商:WILEY‐VCH Verlag    

年代:2001

数据来源: WILEY

摘要:

AbstractProtection and deprotection of alcohols and phenols as tetrahydropyranyl ethers (THP ethers) using an hydrous FeSO4under microwave irradiation without solvent is carried out.

ISSN:0009-4536    

DOI:10.1002/jccs.200100127

出版商:WILEY‐VCH Verlag    

年代:2001

数据来源: WILEY

摘要:

AbstractElvirol methyl ether has been synthesized fromp‐cresol via 2‐(2‐cyclopentenyl)‐4‐methylphenyl methyl ether by ozonolysis, dithioacetalization, reduction, and Wittig reaction. The over all yield

ISSN:0009-4536    

DOI:10.1002/jccs.200100128

出版商:WILEY‐VCH Verlag    

年代:2001

数据来源: WILEY

摘要:

AbstractReactions of aniline with 3‐arylsydnone‐4‐carbohydroximic acid chlorides (1) gave the de sired substitution products5. 3‐Arylsydnone‐4‐carboxamide phenylhydrazones (7) were obtained unexpectedly by the reaction of carbohydroximic acid chlorides1with phenylhydrazine in suitable conditions. Compounds7could react with both aromatic and aliphatic aldehydes in the presence of acid catalyst to give 3‐aryl‐4‐(1′‐phenyl‐5′‐substituted‐1′,2

ISSN:0009-4536    

DOI:10.1002/jccs.200100129

出版商:WILEY‐VCH Verlag    

年代:2001

数据来源: WILEY