摘要:

AbstractThe easy conversion of 3‐oxo‐Δ5(10),9(11)‐19‐norsteroids into 3‐oxo‐Δ4,9,11‐19‐norsteroids by subsequent treatment with a peracid, aluminium oxide, and boron trifluo

ISSN:0018-019X    

DOI:10.1002/hlca.19670500602

出版商:WILEY‐VCH Verlag GmbH    

年代:1967

数据来源: WILEY

摘要:

AbstractThe spectra of 120 semicarbazones in the solide state have been studied between 2.5 and 16 microns in order to correlate absorptions and structures. We have considered most particularly the absorptionsv(N‐H) and the so‐called amid‐I and amid‐I

ISSN:0018-019X    

DOI:10.1002/hlca.19670500603

出版商:WILEY‐VCH Verlag GmbH    

年代:1967

数据来源: WILEY

摘要:

AbstractOn reinvestigation of the reaction of wet phosphorus oxychloride with α,α‐dimethylhomophthalimide, 1‐chloro‐3‐chloromethyl‐4‐methyl‐isoquinoline and 1‐chloro‐4‐chloromethyl‐3‐methyl‐isoquinoline were isolated as the main products (aside from some substances resulting from a redox disproportionation). The production of these two substances can be rationalized by assuming a mechanism in which the rearrangement product is a protonated derivative of 3,4‐dimethylene‐3, 4‐dihydroisoquinoline. With α, α‐diethyl‐homophthalimide the only isolated product was a derivative of 1‐chloro‐3, 4‐diethyl‐isoquinoline, with a chlorine atom in β‐position of one of the ethyl groups, while with α‐methyl‐α‐benzyl‐homophthalimide the isolated product was 1,3‐dichloro‐4‐methyl‐isoquinoline,i.e.elimination had taken place instead of rearrangem

ISSN:0018-019X    

DOI:10.1002/hlca.19670500604

出版商:WILEY‐VCH Verlag GmbH    

年代:1967

数据来源: WILEY

摘要:

AbstractMethanolysis and ethanolysis of 1‐chloro‐3‐chloromethyl‐4‐methyl‐isoquinoline yield respectively 3‐methoxymethyl‐4‐methyl‐isocarbostyril and 3‐ethoxymethyl‐4‐methyl‐isocarbostyril as main products, together with some 3‐chloromethyl‐4‐methyl‐isocarbostyril. By analogous reactions, 1‐chloro‐4‐chloromethyl‐3‐methyl‐isoquinoline yields 4‐methoxymethyl‐3‐methyl‐is

ISSN:0018-019X    

DOI:10.1002/hlca.19670500605

出版商:WILEY‐VCH Verlag GmbH    

年代:1967

数据来源: WILEY

摘要:

AbstractHMO and semi‐empirical SCF calculations on pterine systems of biochemical interest have been performed. The most basic center of each molecule has been determined by correlating the perturbation effect on the transition energy and the spectroscopic data. Additional calculations attempt to show why the redox‐system which interfers in hydroxylation reactions consists of 5,6,7,8‐tetrahydropterine and a quinoidic form. Finally the formation of radicals in the oxidation step of hydrogenated pterines is disc

ISSN:0018-019X    

DOI:10.1002/hlca.19670500606

出版商:WILEY‐VCH Verlag GmbH    

年代:1967

数据来源: WILEY

摘要:

AbstractLes diphényl‐6, 7‐, méthyl‐5‐diphényl‐6, 7‐ et méthyl‐8‐diphényl‐6, 7‐tétrahydro‐5,6,7,8‐ptérines ont été obtenues par reduction au NaBH4des ptérines ou dihydroptérines correspondantes. Alors que la première et la troisième sont facilement réoxydées en dihydro‐7, 8‐ptérines, la méthyl‐5‐diphényl‐6, 7‐tétrahydroptérine, traitée par O2ou par H2O2, fixe un atome d'oxygène pour donner la N(2′)‐déhydro‐hydroxy‐4a‐méthyl‐5‐diphényl‐6, 7‐tétrahydroptérine, stable. Tous ces corps ont été c

ISSN:0018-019X    

DOI:10.1002/hlca.19670500607

出版商:WILEY‐VCH Verlag GmbH    

年代:1967

数据来源: WILEY

摘要:

Abstract2, 3‐seco‐Δ4‐Cholestene‐2, 3‐dicarboxylic acid (5) was prepared in 30% yield from 2‐hydroxymethylene‐Δ4‐cholestene‐3‐one (1) by ozonolysis under special conditions. Pyrolysis of the pure di‐acid5gave A‐nor‐Δ3(5)‐cholestene‐2‐one (6), the anhydride2and 5‐methyl‐3‐oxa‐A‐nor‐5β‐cholestane‐2‐one (8). Pyrolysis of amorphous acidic material obtained by the ozonolysis of1yielded the enol‐lactones7and9as additional products. LiA1H4‐reduction of the γ‐lactone8gave the diol10, which was transformed into 5‐methyl‐3‐oxa‐A

ISSN:0018-019X    

DOI:10.1002/hlca.19670500608

出版商:WILEY‐VCH Verlag GmbH    

年代:1967

数据来源: WILEY

摘要:

AbstractA gas‐chromatographic separation of cocoa aroma, followed by infra‐red and mass‐spectrometric identification, has yielded, besides 22 of the 91 previously described constituents, 35 new substances (8 aliphatic, 1 alicyclic, 7 aromatic, 9 o‐heterocyclic, 4 pyrrolic, and 6 pyr

ISSN:0018-019X    

DOI:10.1002/hlca.19670500609

出版商:WILEY‐VCH Verlag GmbH    

年代:1967

数据来源: WILEY

摘要:

AbstractTrans‐2‐penten‐1‐ol, 1‐ethyl‐2‐formyl‐pyrrole, 2‐trans, 4‐cis‐heptadienal, phenyl‐acetonitrile, methyl benzoate, 2‐phenyl‐but‐2‐enal and the lactone of 2,6,6‐trimethyl‐2‐hydroxy‐cyclohexylidene acetic acid have been separated from black tea aroma by gas‐liquid chromatography, and iden

ISSN:0018-019X    

DOI:10.1002/hlca.19670500610

出版商:WILEY‐VCH Verlag GmbH    

年代:1967

数据来源: WILEY

摘要:

AbstractIt is shown that azulenium cations in the first electronically excited stateS1are stronger acids than in the ground stateS0. Their apparent pK″*, obtained from theH0‐dependence of the quenching of the azulenium cationS1→S0fluorescence doesnotcorrespond to a true acid‐base equilibrium in the electronically excited stateS1. The pK″* values are kinetically controlled, the rate of reprotonation of azulene in theS1state being too low to compete with the internal conver

ISSN:0018-019X    

DOI:10.1002/hlca.19670500611

出版商:WILEY‐VCH Verlag GmbH    

年代:1967

数据来源: WILEY