摘要:

AbstractThe synthesis oftrans‐3‐thiadecal‐1‐one (5) andcis‐3‐thiahydrindan‐1‐one (12) by Dieckmann cyclization (DC) is described. Anions of mercapto‐esters are shown to add to activated cyclohexenes in atransdiaxial fashion in kinetically controlled Michael additions (MA). An explanation is presented for the retro‐MA ofcis‐1‐(2î‐ethoxycarbonylethylthio)‐2‐ethoxycarbonylcycloh

ISSN:0165-0513    

DOI:10.1002/recl.19730920902

出版商:WILEY‐VCH Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractA few compounds having the general formula M(L)+2X−are reported, in which M(I) = Cu or Ag, X−= BF−4, NO−3, Cl−, Br−, and L stands for pyrazole, 3(5)‐methylpyrazole and 4‐nitropyrazole. The compounds are formed by reaction of MX and L in acidic medium. Infrared spectra of the compounds are consistent with linear cations ML+2and uncoordinated anions.Apart from the above compounds, a different class of compounds is formed in less protic media. These compounds are salt like and have the formula M+L−, with M+= Cu+and Ag+and L = pyrazole, 4‐iodopyrazole, 4‐bromopyrazole, 4‐ethylpyrazole, 4‐nitropyrazole and 3(5)‐methylpyrazole.Infrared spectra, mass spectra, X‐ray powder diagrams and solubility studies indicate that these compounds are at least trimeric and possibly polymeric with bridging pyrazolate

ISSN:0165-0513    

DOI:10.1002/recl.19730920903

出版商:WILEY‐VCH Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractElectron transfer reactions to 2‐nitropropylp‐tolyl sulfone (1) using different electron donors, are described. Using potassium 2‐propylnitronate as the electron donor, the product formation is proposed to occurviaa free radical chain process involving rapid elimination ofp‐toluenesulfinate anion from the anion radical derived from 1. When the carbon atom connecting the nitro and sulfonyl groups bears hydrogen, the corresponding α‐sulfonyl nitronate is formed as the only product under comparable conditions. Treatment of l‐iodo‐l‐nitro‐l‐(p‐tolylsulfonyl) propane with potassium 2‐propylnitronate in ethanol affords the potassium salt of l‐nitro‐l‐(p‐tolylsulfonyl) propane, 2,3‐dimethyl‐2,3‐dinitrobutane and iodine. Possible mechanisms for the formation o

ISSN:0165-0513    

DOI:10.1002/recl.19730920904

出版商:WILEY‐VCH Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractAnalysis of the ESR spectrum of the radical cation, derived fromp,p′‐bis‐{phenyl(triphenylphosphorylidene)methyl}biphenyl reveals that spin density is found at both31P nuclei. Zero spin density is indicated for the outer phenyl rings. In the radical cation, derived from the correspondingm,m′‐isomer the spin density is delocalized over one half of the molecule and interaction is found with only one phosphorus atom. In this system the spin density in the outside ring exceeds that in the biphenyl ring. The localization of the odd electron on one half of the molecule must be caused by a strong Jahn‐Teller effect.The assignment of the hyperfine coupling constants was based on spin density calculations according to the Unrestricted Hartree‐Fock (UHF) method. From these calculations we also obtained an indication of the geometry of the radicals.The synthesis of these compound

ISSN:0165-0513    

DOI:10.1002/recl.19730920905

出版商:WILEY‐VCH Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractReactions of some 2‐substituted derivatives of 3‐bromo‐l, 5‐naphthyridine and 3‐bromoquinoline with potassium amide in liquid ammonia were investigated. The course of these aminations is compared with that of corresponding processes studied p

ISSN:0165-0513    

DOI:10.1002/recl.19730920906

出版商:WILEY‐VCH Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractThe manganese hydrogenosulfat is prepared according to the ternary diagram MnSO4‐H2SO4,‐H2O. It crystallizes in the spatial groups P21/cwith two molecules in the cell. A frequences' attribution of the group HSO4is proposed. From a thermal study, the hypothesis of a decomposition mechanism can be propo

ISSN:0165-0513    

DOI:10.1002/recl.19730920907

出版商:WILEY‐VCH Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractThujopsene(1)can be formylated in the 3‐position in 80% yield by use of one equivalent of the Vilsmeier reagent. The resulting 3‐formylthujopsene(4)is useful for the synthesis of other 3‐substituted derivatives (CH2OH, COOH, COCH3). With an excess of the reagent higher formylation products are formed. Two such products have been isolated and characterized and a mechanism for their formation is put fo

ISSN:0165-0513    

DOI:10.1002/recl.19730920908

出版商:WILEY‐VCH Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractThe preparations of the complexes M(PCy3)2X2and M(PCy3)X2with M = Zn, Cd or Hg, X = Cl, Br, I or SCN, PCy3= tricyclohexylphosphine and some of their adducts with acetone, methanol or carbon disulfide are reported. Their infrared spectra in the range 4000‐200 cm−1and their Raman spectra between 4000‐100 cm−1have been investigated. From these data we conclude for the dimeric complexes M(PCy3)X2with M = Cd or Hg and X = Cl, Br or I, a distorted tetrahedral coordination around mercury or cadmium. For the complex Hg(PCy3)(SCN)2we suggest a trigonal coordination around mercury. Assignments are proposed for the metal‐halogen and metal‐phosphorus

ISSN:0165-0513    

DOI:10.1002/recl.19730920909

出版商:WILEY‐VCH Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractThe Lambert‐Buys R‐value method is applied to several six‐membered α‐mono‐α,α‐ andtrans‐α,α′‐di‐substituted glutaric anhydrides. A discussion concerning the appearance of the AA′BB′ spectra of the compounds under consideration is given. The vicinal proton coupling constantsJtrans(7.3‐8.1 Hz) andJcis(4.9‐6.4 Hz) and the corresponding ring dihedral angles (ψ: 49°‐53°) are reported. The results are interpreted in terms of small deformations of the “sofa” conformation

ISSN:0165-0513    

DOI:10.1002/recl.19730920910

出版商:WILEY‐VCH Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractPMR‐spectra of diastereoisomers containing two chiral centres can be elucidated by complexation with the EuIII‐heptadionate shift reagent, as is illustrated for the two pairs of diastereoisomers of both(E)‐α‐ionol (I) and the bicyclic

ISSN:0165-0513    

DOI:10.1002/recl.19730920911

出版商:WILEY‐VCH Verlag    

年代:1973

数据来源: WILEY