摘要:

AbstractSpectrophotometric titration curves of β‐phenylethyl bromide and aluminium bromide at −80° in carbon disulphide and heptane at 430 and 250 mμ respectively show the formation of a 1 : 1 complex by a fast reaction, which goes to comp

ISSN:0165-0513    

DOI:10.1002/recl.19600791102

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

摘要:

AbstractThe synthesis of 17α‐hydroxy‐9β,10α‐progesterone, 6‐dehydro‐17α‐hydroxy‐9β,10α‐progesterone and some acylates of these compounds, and of 21‐acetoxy‐9β,10

ISSN:0165-0513    

DOI:10.1002/recl.19600791103

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19600791104

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19600791105

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19600791106

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

摘要:

AbstractThe structure of the reaction product (WP 155) of 3‐amino‐5‐phenyl‐1,2,4‐triazole and bis‐(dimethylamido)phosphoryl chloride is discussed. By comparing the U. V. absorption spectra of the bromo compound (X) obtained from WP 155 and the three N‐ethyl‐3‐bromo‐5‐phenyl‐1,2,4‐triazoles (VII, VIII, IX) with those of the three known N‐methyl‐3‐methyl‐5‐phenyl‐1,2,4‐triazoles (XI, XII, XIII) it may be concluded that WP 155 is 5‐amino‐1‐[bis(dime

ISSN:0165-0513    

DOI:10.1002/recl.19600791107

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

摘要:

AbstractThe addition of ethanethiol to ethyl (ethylthio)propynoate I (R = C2H5) afforded ethyl α,β‐bis(ethylthio)acrylate III (R = C2H5).Reduction of I gave γ‐(ethylthio)allyl alcohol IX, which was converted into β‐(ethylthio)propionaldehyde X by acid.The Diels‐Alder addition of 1,3‐butadiene to I (R = C2H5) gave rise to ethyl 2‐ethylthio‐3,6‐dihydrobenzoate XII.Interaction of I (R = C2H5) with phenylhydrazine afforded a mixture of the ethyl ester of the phenylosazone of mesoxalaldehyde acid XVII and ethyl 3‐(ethylthio)indol

ISSN:0165-0513    

DOI:10.1002/recl.19600791108

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19600791109

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

摘要:

AbstractThe ultraviolet absorption spectra of a series of methyl‐ and ethyl‐substitutedp,p′‐dimethoxystilbenes were measured. The spectra could be described by assuming the presence of four overlapping absorption bands. Three of these bands, the positions of which (∼ 207, 230 and 285 mμ) are hardly affected by alkyl substitution, are tentatively interpreted as “benzene bands”; 4,4′‐dimethoxydibenzyl is found to show comparable absorptions. The fourth band (at 307 mμ in the case of unsubstituted 4,4′‐dimethoxystilbene) is assumed to correspond to an N → V transition in the stilbene chromophore. With the substituted dimethoxystilbenes the oscillator strength of this band decreases in the following sequence: α‐methyl‐ ; 2,2′‐dimethyl‐ ; 2,2′‐diethyl‐ ; α,2′‐dimethyl‐ ; α,2‐dimethyl‐ ; 2,2′,6,6′‐tetramethyl‐ ; α,α′‐dimethyl‐ ; α,2,2′‐trimethyl‐ ; α,α′‐diethyl‐ ; α,α′,2‐trimethyl‐ and α,α′,2,2′‐tetramethyl‐4,4′‐dimethoxystilbene.There is an increasing hypsochromic shift that in general runs parallel to the decrease in extinction coefficient, λmaxgradually falling from 307 mμ to ∼ 230 mμ.The angles of twist (ψ) of the phenyl nuclei are estimated from the oscillator strengths of the long‐wavelength stilbene absorption bands. The values obtained show qualita

ISSN:0165-0513    

DOI:10.1002/recl.19600791110

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY

摘要:

AbstractA synthesis is described of the protected linear decapeptide:N‐benzyloxycarbonyl‐S‐benzyl‐L‐cysteinyl‐L‐tyrosyl‐L‐tyrosyl‐L‐tyrosyl‐L‐glutaminyl‐L‐asparaginyl‐S‐benzyl‐L‐cysteinyl‐L‐prolyl‐Ne‐p‐toluene‐sulphonyl‐L‐lysylglycineamide (VI) in analytically pure form.Removal of the blocking groups from VI, followed by cyclization through oxidation, yielded a preparation which was assumed to contain an analogue of lysine‐vasopressin, with L‐phenylalanine “replaced” by two consecutiveL‐tyrosyl radicals.This synthesis was performed in connection with our previous studies on the relation between chemical structur

ISSN:0165-0513    

DOI:10.1002/recl.19600791111

出版商:WILEY‐VCH Verlag    

年代:1960

数据来源: WILEY