ISSN:0165-0513    

DOI:10.1002/recl.19800990601

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractThe anions derived from dithio esters1react with alkyl alkanethiosulfonates in 1,2‐dimethoxyethane to give the S‐sulfenylated products3. Nucleophilic reagents like potassiumtert‐butoxide, dithio ester anions or ‐ in some cases ‐ even (liquid) ammonia catalyse the rearrangement of 3 into the C‐sulfenylated compounds4. The latter compounds can be isolated directly, if the dithio ester anions2are allowed to react with thiosulfonates in liquid ammonia or with thiocyanates in dimethoxyethane or liq

ISSN:0165-0513    

DOI:10.1002/recl.19800990602

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractThe geminal13C1H coupling constants in ethyl, isopropyl andtert‐butyl compounds having elements of the first row of the Periodic Table and halogens as substituents are determined by single resonance13C FT NMR spectroscopy. In addition, the values of directly bonded13C13C coupling constants are given. The substituent electronegativity dependence of the geminal13C1H coupling constant is discussed. It is concluded that the influence exerted by a β‐methyl substituent on the geminal13C1H coupling constant of 13Cα‐Cβ‐1H fragments is not constant and hence no simple additivity relation can be established for this

ISSN:0165-0513    

DOI:10.1002/recl.19800990603

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractThe synthesis and characterization of new Pt(II) coordination compounds with the nitrogen‐donor ligands 2‐methylimidazole (2MIz) and 1,2‐dimethylimidazole (DMIz) are described. The compounds concerncis‐Pt(2MIz), X2,cis‐Pt(DMIz)2X2, [Pt(2MIz)4]X2(H2O)n, [Pt(DMIz)4]X2,trans‐Pt(DMIz)2X2where X = Cl, Br or I and n = 0 or 2, andtrans‐Pt(2MIz)2I2. Despite several attempts no other puretrans‐platinum compounds of 2MIz could be obtained.The new compounds were characterized by chemical analyses, X‐ray powder diffraction photographs, vibrational spectroscopy (IR and far‐IR) and proton nuclear magnetic resonance.In all cases the metal(II) ions are square

ISSN:0165-0513    

DOI:10.1002/recl.19800990604

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractElectro‐reduction of diethyl(trichloromethyl)phosphonate in the presence of aldehydes or ketones replaces the oxygen atom of the carbonyl group by a dichloromethylene group. The yield of 1,1‐dichloroethene product decreases substantially if the carbonyl compound carries strongly acidic hydrogen. In several cases the conversion of the four‐membered ringWittigintermediate into its corresponding carbanion by heterolytic PC bond cleavage is observed. The intermediate carbanion is sufficiently stable to be intercepted by proton abstraction. These observations suggest that, at least with our substrates, the decomposition of theWittigfour‐membered ring intermediate occurs along a two‐st

ISSN:0165-0513    

DOI:10.1002/recl.19800990605

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractElectroreduction of α,α′‐dihalo ketones to cyclopropanones (isolated as the hemiacetals or hemiacylals) is accomplished with good yields only with highly alkylated α,α′‐dihalo ketones. Attempts to prepare little substituted or unsubstituted cyclopropanone (derivatives) by electroreduction of α,α′‐dihalo ketones in which the carbonyl group is protected as an acylal or aminal resulted in the isolation of the desired compounds in low yields. The cyclisation reaction cannot compete successfully with side‐reactions. With acetals as the protecting group, the reductive cyclisation proceeds smoothly. Contrary to the acetals, the cyclopropanone acylals are excellent precursors

ISSN:0165-0513    

DOI:10.1002/recl.19800990606

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractThe acid catalyzed rearrangement of 1‐bromotetracyclo[4.3.0.02.503.8]nonan‐4‐one 1b has been studied. With aqueous HBr, the exclusive formation of 2,7‐dibromotricyclo[4.2.1.03.7]‐nonan‐4‐one4bwas observed. This structure was established by X‐ray analysis. The divergency in behaviour of seco‐homocubane1band its 9‐ethylene acetal derivative 1a towards acidic reagents reveals a directing effect of the 9‐ethylene acetal function on the s

ISSN:0165-0513    

DOI:10.1002/recl.19800990607

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractThe synthesis and some properties of the novel triallyl compounds Cp*M(CH2CHCHCH3)3(Cp*=η5‐C5(CH3)5; M=Ti, Zr or Hf ) and the butadiene‐methallyl compounds Cp*M(η4‐butadiene) (η3‐methallyl) therefrom are reported. The compounds are very reactive towards carbon monoxide and other sma

ISSN:0165-0513    

DOI:10.1002/recl.19800990608

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY