摘要:

AbstractAddition of phenols and of alcohols to ethoxyethyne, under the influence of mercury(II) acetate and zinc chloride respectively, affords orthoacetates. Ketene acetals can be isolated with sterically hindered phenols.

ISSN:0165-0513    

DOI:10.1002/recl.19750940902

出版商:WILEY‐VCH Verlag    

年代:1975

数据来源: WILEY

摘要:

AbstractStability constants and stereoselective effects are measured for copper(II) complexes with aspartate (asp), glutamate (glut), histidinate (his) and someN‐alkylhistidinate derivatives:N‐methyl‐ (mhis),N,N‐dimethyl‐ (dimhis) andN‐benzylhistidinate (bhis). For the dicarboxylic amino acids the predominant species in solution are CuA, CuHA and CuA2*; for histidine and its derivatives:CuA, CuHA, CuA2and CuHA2. By comparison of competition constants (vide infra) it is found that the ligand is boundviaits glycine‐locus in all complexes CuHA. For complexes CuHA2, the mono‐protonated ligand, HA, is also bound to copper by its glycine‐locus if A = his and bhis, and mainly so if A = mhis, but, if A = dimhis, HA, possibly, is monodentate and bound to copper by its imidazole group. No stereoselective effects are found in complexes CuA2for A = asp, glut, his and mhis; for A = dimhis a significant positive effect (i.e.in favour of themesocomplex Cu(DA)(LA)) is found, in contrast to the case for A = bhis. In the protonated copper complexes CuHA2, small negative effects are found for A = his, mhis and bhis, but

ISSN:0165-0513    

DOI:10.1002/recl.19750940903

出版商:WILEY‐VCH Verlag    

年代:1975

数据来源: WILEY

摘要:

AbstractThe reaction between 1′,3′,3′‐trimethylspiro[2H‐1‐benzopyran‐2,2′‐indoline] and its derivatives (3a‐e) and 1,1‐bis[4‐(dimethylamino)phenyl]ethylene (“Michler's ethylene”) (4) were studied. Depending on the reaction time, the isomeric products 2,2‐bis[4‐(dimethylamino)phenyl]‐4‐{2‐methylidene‐1,3,3‐trimethylindoline}chromans (7a‐e) or 1′,3′,3′‐trimethyl‐4‐{2,2‐bis[4‐(dimethyl‐amino)phenyl]vinyl}‐spiro[chroman‐2,2′‐indolines](8a‐d) were obtained. With deuterium labelled “Michler's ethylene” and deuterated solvents the mechanism of this reaction was confirmed. Reaction of the 2,2‐bis[4‐(dimethylamino)phenyl]‐2H‐chromenes10c,dand 1,3,3‐trimethyl‐2‐methylene‐indoline (9) furnished the dihydrospiropyrans8c,d. Chromene10cand 1,1‐bis(p‐methoxyphenyl)‐ethylene gave 2.2‐bis(4‐methoxyphenyl)‐4‐ [2,2‐bis[4‐(dim

ISSN:0165-0513    

DOI:10.1002/recl.19750940904

出版商:WILEY‐VCH Verlag    

年代:1975

数据来源: WILEY

摘要:

AbstractReaction of 1′,3′,3′‐trimethylspiro[2H‐1‐benzopyran‐2,2′‐indolines] with 1,1‐bis[4‐(dimethylamino)phenyl]ethylene can give two types of isomeric products, 2,2‐bis[4‐(dimethylamino)‐phenyl]‐4‐{2‐methylidene‐1,3,3‐trimethylindoline}chromans (2a–e) and 1′,3′,3′‐trimethyl‐4‐{2,2‐bis[4‐(dimethylamino)phenyl]vinyl}‐spiro[chroman‐2,2′‐indolines](3a–d).These products and related compounds have been analysed by spectroscopic methods. The conformation of the dihydropyran ring and the chemical

ISSN:0165-0513    

DOI:10.1002/recl.19750940905

出版商:WILEY‐VCH Verlag    

年代:1975

数据来源: WILEY

摘要:

AbstractPhenanthrenequinone (1) reacts with 1‐dialkylamino‐1‐alkynes2via(2 + 2)‐cyclo‐addition to γ‐oxo‐α,β‐unsatutrated amides3Eof the quinone methide type.These adducts isomerise under the influence of base to α,β‐unsaturated hydroxyamides4. Irradiation of the adducts3Ein benzene affords the same α,β‐unsaturated hydroxyamides4viaintramolecular hydrogen‐abstraction.Treatment of3Ewith boron trifluoride gives 3‐alkyl‐3‐dialkylamino‐2,3‐dihydrophenanthro[9,10‐b]furan‐2‐ones6in good yields. With hydrochloric acid in acetic acid, the unsaturated hydroxyamides 4 afford 3‐alkylidene‐2,3‐dihydrophenanthro[9,10‐b]furan‐2‐ones 7. Similar reactions have been

ISSN:0165-0513    

DOI:10.1002/recl.19750940906

出版商:WILEY‐VCH Verlag    

年代:1975

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19750940901

出版商:WILEY‐VCH Verlag    

年代:1975

数据来源: WILEY