摘要:

AbstractEthers with the systems , CH3CCCH(OR)2, CH3CCCH(OR)3or ‐CH2‐CH2‐CCOR undergo an elimination of ROH [R = alkyl, 2‐alkynyl (‐CH2CC‐R′) phenyl, or 2‐tetrahydropyranyl] with formation of 1,3‐enyne derivatives, , on treatment with alkali amides in liquid ammonia.The cyclic ethers: and are isomerized under these conditions to the 1,3‐enyne carbinols HCC‐C

ISSN:0165-0513    

DOI:10.1002/recl.19650840302

出版商:WILEY‐VCH Verlag    

年代:1965

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19650840303

出版商:WILEY‐VCH Verlag    

年代:1965

数据来源: WILEY

摘要:

AbstractThe effect of substituents on the geometry of thiobenzophenones is derived from the arylthiocarbonyl U.V.‐absorption at 300‐375 nm.Hammettσ‐constants can be correlated with the energy of the n→π* transition of the thiocarbonyl group near 600 nm. Absorption at 230 nm can be ascribed partly to aryl‐aryl interaction by comparison with substituted diar

ISSN:0165-0513    

DOI:10.1002/recl.19650840304

出版商:WILEY‐VCH Verlag    

年代:1965

数据来源: WILEY

摘要:

AbstractInortho‐methylthiobenzophenone the unsubstituted phenyl group is nearly coplanar with the thiocarbonyl group, whereas theo‐tolyl group is not.The phenylthiocarbonyl absorption band shifts upon introduction ofmeta‐andpara‐ substituents according to various σ‐values. A similar quantitative correlation exists for the i

ISSN:0165-0513    

DOI:10.1002/recl.19650840305

出版商:WILEY‐VCH Verlag    

年代:1965

数据来源: WILEY

摘要:

AbstractThe shifts in the CS stretching vibration caused by various substituents in thiobenzophenone are so small that no good correlations between substituent constants and absorption frequencies is found.Differences between the n.m.r. spectra of thiobenzophenones and benzophenones can be explained with the aid of conformations deduced from the electronic spectr

ISSN:0165-0513    

DOI:10.1002/recl.19650840306

出版商:WILEY‐VCH Verlag    

年代:1965

数据来源: WILEY

摘要:

AbstractThe effect of hydrogen peroxide on 5,6‐diphenyl‐2,3‐dihydropyrazine has been studied. Several reactions take place which might be considered as models for some of the spontaneous conversions shown by partially reduced pyrazines on exposure to air. In no case was 5,6‐diphenyl‐2,3‐dihydropyrazine 1,4‐di‐N‐oxide formed, but products of ring‐opening:N/N′‐dibenzoylethylenediamine, andN‐benzoylethylenediamine, and a product of a most interesting ring‐contraction: 2‐phenyl‐2‐imidazoline. In addition some 2,3‐diphenylpyrazine could be isolated. Reaction mechanisms have been postulated; the primary product of oxidation has been formulated as 5,6‐diphenyl‐1,2,3,6‐tetrahydro‐pyrazine 6‐hydroperoxide.Tetrahydropyrazine hydroperoxides may also be formed spontaneously, for example, after catalytical hydrogenation, if tetrahydropyrazines are exposed to air. The results described in this paper seem also to be of some importance in the fields of condensed pyrazines like quinoxalines, pteridines, iso‐alloxazines and, moreover, they contain

ISSN:0165-0513    

DOI:10.1002/recl.19650840307

出版商:WILEY‐VCH Verlag    

年代:1965

数据来源: WILEY

摘要:

AbstractIsochroman‐1,4‐dione reacted with formaldehyde to give a methylenebiscompound which is the exact analogue of dicoumarol, although it lacks the latter's potent anticoagulant properties. A similar reaction was observed with pyridine‐2‐aldehyde, but with benzaldehyde, 3‐benzylideneisochroman‐1,4‐dione

ISSN:0165-0513    

DOI:10.1002/recl.19650840308

出版商:WILEY‐VCH Verlag    

年代:1965

数据来源: WILEY

摘要:

AbstractThe incorporation of acetate‐α‐14C in the liver higher fatty acids of normal and ketotic cows has been studied.In vitroincubations with liver slices, obtained by biopsy, showed an inhibited synthesis of these acids in ketotic livers compared with that in normal livers. The inhibition ranged from 18% to 72% in accordance with the intensity of the ket

ISSN:0165-0513    

DOI:10.1002/recl.19650840309

出版商:WILEY‐VCH Verlag    

年代:1965

数据来源: WILEY

摘要:

AbstractThe purpose of the investigation was to gather data on the course of the substitution of chlorine by dimethylamine in hexachloro‐1,3,5,2,4,6‐triazatriphosphorine. In the course of this reaction a geminal substitution occurs besides the consecutive substitution in the 2,4 and 6 positions. The structure of the three tetrachlorobisdimethylamino and the three trichlorotrisdimethylamino‐1,3,5,2,4,6‐triazatriphosphorine was determined. Contrary to previously published results1, the 2,4‐bisdimethylamino derivative already described byBecke Goehring2has the trans conf

ISSN:0165-0513    

DOI:10.1002/recl.19650840310

出版商:WILEY‐VCH Verlag    

年代:1965

数据来源: WILEY

摘要:

AbstractA study has been made of the copper‐catalysed reaction of NO with diethylamine, which at 30° yields nitrosodiethylamine and N2O. A mechanism is proposed in which the cupric ion in combination with NO functions as the nitrosating agent for the amine. The cuprous complex formed in this reaction is rapidly reoxidized by the adduct of diethylamine and NO, (C2H5)2NH2+ · (C2H5)2N · (NO)O−, which yields the fragments NO−(or NOH) and (C2H5)2N · NO−. The radical‐anion reacts with NO to regenerate the original adduct while NOH yields nitrous ox

ISSN:0165-0513    

DOI:10.1002/recl.19650840311

出版商:WILEY‐VCH Verlag    

年代:1965

数据来源: WILEY