摘要:

AbstractUsing the results of an analysis of the vibrational spectra of azulene and three deuterated modifications of it, the establishment of a correlation between charge order, calculated from different theoretical treatments, and the CH‐stretching frequencies of light azulene has been attempted. A monotone relationship has been found for each type (A1andB1) of these vibrations, the frequency increasing with enlarging negative charge orde

ISSN:0018-019X    

DOI:10.1002/hlca.19630460202

出版商:WILEY‐VCH Verlag GmbH    

年代:1963

数据来源: WILEY

摘要:

AbstractKopsine (I) undergoes a reversible acyloin rearrangement to isokopsine (111) under acid catalysis or preferably by the action of heat. On alkaline treatment both bases undergo N‐decarbomethoxylation to give the same mixture of decarbomethoxy‐kopsine (IX) and decarbomethoxy‐isokopsine (V). IV and V are easily interconvertible by action of acid, base or heat. Reduction of isokopsine (111) by sodium borohydride followed by decarbomethoxylation leads to decarbomethoxy‐dihydro‐isokopsine (XIII) also obtained by borohydride reduction of V. A similar reduction of IV leads to two epimeric alcohols, VII and X, which are respectively formed by alkaline hydrolysis of dihydrokopsines‐A (VI) and B (IX). Indications have been obtained for the occurrence in the dried leaves ofKopsia fruticosaof IV and V from both of which fruticosine i

ISSN:0018-019X    

DOI:10.1002/hlca.19630460203

出版商:WILEY‐VCH Verlag GmbH    

年代:1963

数据来源: WILEY

摘要:

AbstractThe solubility of aged iron(III) hydroxide precipitates was investigated by determining [Fe3+] and [H+] of solutions in contact with the solid phases. [Fe3+] and [H+] were measured by the EMF.‐method at the constant ionic strength 3M (Na)C104. The precipitates were investigated by X‐ray and electron microscope methods. The following equilibrium constants were deri

ISSN:0018-019X    

DOI:10.1002/hlca.19630460204

出版商:WILEY‐VCH Verlag GmbH    

年代:1963

数据来源: WILEY

摘要:

AbstractEs wird der Aufbau von 3‐Alkoxy‐4,4‐dialkyl‐4H‐l,2‐thiazet‐l, 1‐dioxiden beschrieben, welche Derivate eines bisher praktisch unbekannten ungesattigten viergliedrigen Heterocyclus mit zwei benachbarten Heteroatomen sind. Diese Substanzen werden aus den 4,4‐Dialkyl‐l, Z‐thioazetidin‐3‐on‐1,l‐dioxiden neben den 2,4,4‐Trialkyl‐1,2‐thioazetidin‐3‐on‐l, 1‐dioxiden durch Alkylierung in Gegenwart von Silberoxid erhalten. Es wird über die chemischen und physikalisch‐chemischen Eigenschaften dieser neuen Verbindungen

ISSN:0018-019X    

DOI:10.1002/hlca.19630460205

出版商:WILEY‐VCH Verlag GmbH    

年代:1963

数据来源: WILEY

摘要:

AbstractThe effects of substituents on ring protons as well as on methylgroups in mesitylenes and durenes are compared with substitution effects in benzene.

ISSN:0018-019X    

DOI:10.1002/hlca.19630460206

出版商:WILEY‐VCH Verlag GmbH    

年代:1963

数据来源: WILEY

摘要:

AbstractThe construction characteristics of the Geneva Whole Body Counter are given and the techniques used for measuring the subjects and calibrating natural potassium,l37Cs and radium contamination in humans are described. The radium body burdens of a first series of 70 professionally contaminated cases are given.

ISSN:0018-019X    

DOI:10.1002/hlca.19630460207

出版商:WILEY‐VCH Verlag GmbH    

年代:1963

数据来源: WILEY

摘要:

AbstractThe urinary excretion of two persons contaminated by90Sr was followed up for 34 weeks. The excretion curve of one of these persons, whose contamination ceased 940 days before the beginning of the analyses, and which corresponds to a period of slow elimination, indicates a half‐time value of 2502 days. The curve of the other one, which has been taken just after contamination ceased and which corresponds therefore to a period of more rapid elimination, indicates a half‐time value of 337 d

ISSN:0018-019X    

DOI:10.1002/hlca.19630460208

出版商:WILEY‐VCH Verlag GmbH    

年代:1963

数据来源: WILEY

摘要:

AbstractThe products isolated from the HOFMANNdegradation oftransandcis1,6‐bis‐trimethylammonio‐cyclodecane (1a) depend on the reaction temperature. When carried out below 100° or when WITTIG'Slow‐temperature modification, i.e. with KNH2in liquid ammonia, is employed, cyclodeca‐l,5‐ and ‐1,6‐dienes are formed almost exclusively, as shown by their hydrogenation to cyclodecane. When heated above 70° cyclodeca‐l,5‐diene (2) undergoes valency isomerisation to 1,2‐divinylcyclohexane (4). This compound is obtained directly in ca. 45% yield besides 46% of non‐isomerisable cyclodeca‐l,5‐ and ‐1,6‐dienes when the HOFMANNelimination is carried out at 120–150°. In addition, ca. 9% of octalines are formed by a transannular elimination reaction. The COPEelimination reaction of the bis‐N‐oxide oftransandcis1,6‐bis‐dimethylarnino‐cyclodecane (1c) at 120–150° affords a similar mixture of products containing ca. 43% of 1,2‐divinylcyclohexane. The ease with which cyclodeca‐l,5‐diene undergoes valency isomerisation is attributed to the concomitant relief of strain and to the pr

ISSN:0018-019X    

DOI:10.1002/hlca.19630460209

出版商:WILEY‐VCH Verlag GmbH    

年代:1963

数据来源: WILEY

摘要:

AbstractThe preparation of the DIELS‐ALDERadduct of 1,4‐naphthoquinone and 5,5‐dimethoxy‐l,2,3,4‐tetrachlorocyclopentadiene is described and it is further shown how this adduct may be transformed into 1,2,3,4‐tetrachloroanthraquinone (30%), 1,2,3,4‐tetrachloro‐9‐anthrone (75%) and 2,3,4‐trichloroanthraquinone‐l ‐carboxylic

ISSN:0018-019X    

DOI:10.1002/hlca.19630460210

出版商:WILEY‐VCH Verlag GmbH    

年代:1963

数据来源: WILEY

摘要:

AbstractDie Struktur I des in sehr kleiner Menge in den Wurzeln vonPleiocarpa tubicinaSTAPFvorkommenden gelben Indolalkaloids Tuboflavin wurde durch Abbaureaktionen und mit spektroskopischen Methoden aufgeklärt

ISSN:0018-019X    

DOI:10.1002/hlca.19630460211

出版商:WILEY‐VCH Verlag GmbH    

年代:1963

数据来源: WILEY