摘要:

AbstractThe acid catalyzed addition of water to ethylthioethyne has been studied in aqueous solution. The reaction is general acid catalyzed and it is faster in H2O than in D2O. Substitution of a tertiary butyl group for the ethyl group results in a rate enhancement. The entropies of activation ΔS≠ for the hydration of ethylthioethyne and tertiary butylthioethyne are ‐ 6.1 and ‐ 0.6 cal. mole−1, deg.−1, respectively. These facts strongly suggest that protonation of the alkylthioethyne is the rate controlling step of th

ISSN:0165-0513    

DOI:10.1002/recl.19600791002

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

摘要:

AbstractThe quantum yields of the isomerizations of pre‐ergocalciferol and tachysterol2in ether at 20° under the influence of ultraviolet light of 2537 Å were found to be 0.49 and 0.11 respectively. Ergosterol is not formed from tachysterol2during irradiation but originates exclusively from pre‐ergocalciferol. The origin of lumisterol2is somewhat less certain; it seems to be formed from tachyst

ISSN:0165-0513    

DOI:10.1002/recl.19600791003

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

摘要:

AbstractTheortho‐, meta‐ and para‐isomers of methyl‐, ethyl‐, isopropyl‐ and tertiary butylbenzaldehyde have been synthesized for the purpose of an olfactory study1 To be published.. The aldehydes were isolated and purified via the semicarbazones. The ultra‐violet absorption spectra of the aldehydes as well as those of the semicarbazones were determined. Particular attention was paid toortho‐alkylbenzaldehydes as to whether there is any steric effec

ISSN:0165-0513    

DOI:10.1002/recl.19600791004

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

摘要:

AbstractThe synthesis is described of the protected linear decapeptide:N‐benzyloxycarbonyl‐S‐benzyl‐L‐cysteinyl‐L‐tyrosyl‐L‐tyrosyl‐L‐phenylalanyl‐L‐glutaminyl‐L‐asparaginyl‐S‐benzyl‐L‐cysteinyl‐L‐prolyl‐N6‐tosyl‐L‐lysylglycineamide (II, Fig. 2).Removal of the blocking groups from II, followed by oxidation, yielded a preparation believed to contain a “homologue” of lysine‐vasopressin with two consecu

ISSN:0165-0513    

DOI:10.1002/recl.19600791005

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

摘要:

AbstractThe synthesis is described of the protected linear decapeptide:N‐benzyloxycarbonyl‐S‐benzyl‐L‐cysteinyl‐L‐tyrosyl‐L‐tyrosyl‐L‐phenylalanyl‐L‐glutaminyl‐L‐asparaginyl‐S‐benzyl‐L‐cysteinyl‐L‐prolyl‐L‐leucylglycineamide (III, Fig. 2).Removal of the blocking groups from III, followed by oxidation, yielded a preparation assumed to contain a “homologue” ofoxypressinwith two consecutive m

ISSN:0165-0513    

DOI:10.1002/recl.19600791006

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

摘要:

AbstractThe synthesis is described of the protected linear decapeptide:N‐benzyloxycarbonyl‐S‐benzyl‐L‐cysteinyl‐L‐tyrosyl‐L‐tyrosyl‐L‐isoleucyl‐L‐glutaminyl‐L‐asparaginyl‐S‐benzyl‐L‐cysteinyl‐L‐prolyl‐Ne‐tosyl‐L‐lysylglycineamide (II, Fig. 2).Removal of the blocking groups from II, followed by oxidation, yielded a preparation assumed to contain a “homologue” oflysine‐vasotocinwith two consecu

ISSN:0165-0513    

DOI:10.1002/recl.19600791007

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

摘要:

AbstractThe synthesis is described of the protected linear nonapeptide:N‐benzyloxycarbonyl‐S‐benzyl‐L‐cysteinyl‐L‐tyrosyl‐L‐tyrosyl‐L‐glutammyl‐L‐asparaginyl‐S‐benzyl‐L‐cysteinyl‐L‐prolyl‐Ne‐p‐toluenesulfonyl‐L‐lysylglycineamide (II, Fig. 2) in analytically pure form.Removal of the blocking groups from II, followed by cyclization through oxidation, yielded a preparation assumed to contain an analogue of lysine8‐vasopressin w

ISSN:0165-0513    

DOI:10.1002/recl.19600791008

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

摘要:

AbstractElectric dipole moments of the following compounds have been measured in benzene solution: C2H5OC2H5, H2CCHOC2H5, HC ≡ COC2H5, H3CC ≡ COC2H5, HC ≡ COCH3and H3CC ≡ COCH3. The charge shift, caused by resonance, in HC ≡ COC2H5and HC ≡ COC

ISSN:0165-0513    

DOI:10.1002/recl.19600791009

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

摘要:

AbstractAn empirical LCAO MO method, in which self‐consistency was introduced, was applied to molecules of the general structure ABCS and ACS2−, in which A and B are saturated radicals bonded to the thione or dithioate group by carbon, sulphur, oxygen or nitrogen.The transition energies forn→ π* and π →π* transitions, the resonance energies and the charge diagrams are evaluated. The calculated transition energies proved to be related to the measured absorption frequencies for both transitions. A discrepancy is encountered between the experimental and theoretical assignment of the π → π* transition for the nitrogen‐

ISSN:0165-0513    

DOI:10.1002/recl.19600791010

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

摘要:

AbstractThe preparation of a series of IVth group organometallic vinyl monomers derived from styrene and α‐methylstyrene, respectively, is described. Thermal or radical‐initiated polymerization of the styrene derivatives afforded transparent, solid organometal‐substituted polystyrenes. The monomers of the general structurep‐(CH3)3MIVC6H4CH  CH2display appreciably different rates of radical‐initiated polymerization, in the order P

ISSN:0165-0513    

DOI:10.1002/recl.19600791011

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY