摘要:

AbstractE.m.f.‐measurements on cells of the type: Hg/Hg2Cl2/saturated KCl‐soln. (aq.)/standard buffer soln./saturated KCl‐soln.(aq.)/Hg2Cl2/Hg, using standard buffer solutions in methanol‐water and ethanol‐water mixtures and liquid‐junction forming devices of different design, showed that, for three different boundary‐types, the liquid‐junction potentials are identical within experimental error.E.m.f.‐measurements on cells of the type: glass electrode/standard buffer soln./saturated KCl‐soln.(aq.)/Hg2Cl2‐Hg, using succinate standard buffer solutions in methanol‐water and ethanol‐water mixtures and different types of glass electrodes, proved that the variation of the standard potential of these glass electrodes with the composition of the alcohol‐water mixture does not depend on the type of glass electrode.These results, together with the previously shown fact, that liquid‐junction potentials at the boundaries standard buffer soln. (alcohol‐water)/saturated KCl‐soln.(aq.) are independent of the nature of the buffering solute, render possible the determination of pa*H‐values of solutions in alcohol‐water mixtures by calibration of a pH‐meter with the aid of anaqueousstandard buffer solution and correction of the pH‐readings with a correction termδ.For a number of methanol‐water and ethanol‐water mixtures δ‐values are tabulated and graphs, showing the variation of

ISSN:0165-0513    

DOI:10.1002/recl.19660850702

出版商:WILEY‐VCH Verlag    

年代:1966

数据来源: WILEY

摘要:

AbstractThe sources of error pertaining to the oscilloscopic determination of rate constants of electrode reactions are studied and the upper and lower limits of the methods are given. The former is mainly determined by the accuracy with which the moment of zero diffusion polarization can be adjusted.It is shown that the extrapolation of cell responses to zero frequency does not eliminate the contribution of the double layer capacitance completely. The remaining contribution is a negative resistance,‐2 σ2Cd, irrespective of wavefo

ISSN:0165-0513    

DOI:10.1002/recl.19660850703

出版商:WILEY‐VCH Verlag    

年代:1966

数据来源: WILEY

摘要:

AbstractThe synthesis of several derivatives of 4‐oxo‐1,2,3,4‐tetrahydroquinoline and 4‐oxo‐1,2,3,4‐tetrahydrobenz[h]quinoline i

ISSN:0165-0513    

DOI:10.1002/recl.19660850704

出版商:WILEY‐VCH Verlag    

年代:1966

数据来源: WILEY

摘要:

AbstractAcylation of severalN‐tosyldihydroquinolones andN‐tosylbenz[h]dihydroquinolones under alkaline conditions, gave results depending strongly on the steric volume of the ester employed. An explanation for this phenomenon is offered. The resulting α‐acylated ketones have been converted to the corresponding 2H‐pyrazolo[4,3‐c]quinolines and 2H‐benz[h]pyrazolo[4,3

ISSN:0165-0513    

DOI:10.1002/recl.19660850705

出版商:WILEY‐VCH Verlag    

年代:1966

数据来源: WILEY

摘要:

AbstractThe second‐order rate constants of the alkaline hydrolysis at different temperatures of a number of nitrophenyl phosphorus esters and the values of the quantities ΔH* and ΔS* at 25°C are reported. The effect of structural changes on the values of ΔH* and ΔS* are considered and are compared with similar changes in other nucleophilic substitution reactions, on both phosphorus and carbon

ISSN:0165-0513    

DOI:10.1002/recl.19660850706

出版商:WILEY‐VCH Verlag    

年代:1966

数据来源: WILEY

摘要:

AbstractFermentation of 9β,10α‐progesterone withSporormia pollacciiyielded mainly 9β,10α‐testosterone.Fermentation withHelicosporium lumbricopsisafforded 9β,10α‐androst‐4‐ene‐3,17‐dione.Fermentation withColletotrichum gloeosporioidesafforded 15α‐hydroxy‐9β,10α‐progesterone. This product was converted withHelicosporium lumbricopsisto 15α‐hydroxy‐9β,10α‐androst‐4‐ene‐3,17‐dione. Fermentation of 6‐dehydro‐9β,10α‐progesterone withMastigosporium hete

ISSN:0165-0513    

DOI:10.1002/recl.19660850707

出版商:WILEY‐VCH Verlag    

年代:1966

数据来源: WILEY

摘要:

AbstractFermentation of progesterone, 9β,10α‐progesterone, 6‐dehydro‐9β,10α‐progesterone and 9β,10α‐testosterone withSepedonium ampullosporumafforded the respective 16α‐h

ISSN:0165-0513    

DOI:10.1002/recl.19660850708

出版商:WILEY‐VCH Verlag    

年代:1966

数据来源: WILEY

摘要:

AbstractFermentation of 17α,21‐dihydroxy‐9β,10α‐pregn‐4‐ene‐3,20‐dione withAspergillus ochraceusyielded 11α,17α,21‐trihydroxy‐9β,10α‐pregn‐4‐ene‐3,20‐dione and 15α,17α,21‐trihydroxy 9β,10α‐pregn‐4‐ene‐3,20‐dione. Fermentation of 9β,10α‐progesterone withAspergillus ochraceusafforded 11α‐hydroxy‐9β,10α‐progesterone.Fermentation of the latter product withSporomia pollacciiandHelicosporium lumbricopsisafforded 11α‐hydroxy‐9β,10α‐testosterone and 11α‐hydroxy‐9β,10α‐androst‐4‐ene‐3,17‐dione.Fermentation of 9β,10α‐testosterone withAspergillus ochraceusyielded 11α‐hydroxy‐9β,10α‐testosterone and 11α‐hydroxy‐9β,10α‐androst‐4‐ene‐3,17‐dione.Fermentation of 17α‐hydroxy‐9β,10α‐prog

ISSN:0165-0513    

DOI:10.1002/recl.19660850709

出版商:WILEY‐VCH Verlag    

年代:1966

数据来源: WILEY

摘要:

AbstractThe structure of a microbiological hydroxylation product of 17α,21‐dihydroxy‐9β,10α‐pregn‐4‐ene‐3,20‐dione is found to be 11α,17α,21‐trihydroxy‐9β, 10α‐pregn‐4‐ene‐3,20‐dione. This product is converted into 9β,10α‐cortisone and to 9β,10α‐hydrocortisone. Reduction of the 11‐keto group with lithium aluminium hydride proceeds with the formation of 11β‐hydroxy in minor quantity only. The stereochemistry of the 11‐hydroxyl compounds is discussed on the

ISSN:0165-0513    

DOI:10.1002/recl.19660850710

出版商:WILEY‐VCH Verlag    

年代:1966

数据来源: WILEY

摘要:

AbstractThe preparation of a number of 2,8‐substituted 1,2,3,4,6,7,8,12c‐octahydroindolo[3,2‐α]quinolizines, using a 2‐(2‐aminoethyl)indole derivative and 3‐substituted glutaric anhydrides, or 3‐substituted 5‐bromovalerates, as starting materia

ISSN:0165-0513    

DOI:10.1002/recl.19660850711

出版商:WILEY‐VCH Verlag    

年代:1966

数据来源: WILEY