Zobrazeno 1 - 10
of 61
pro vyhledávání: '"Hans Westmijze"'
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 100:249-255
This paper describes a stereospecific synthesis of nine 2E,6E, 10(Z)-trienyl esters R1R2CCH(CH2)2CR3CH(CH2)2CR4CHCO2Me (1a-i) and their selective conversion into the corresponding epoxides (7a-i), including the natural occurring hormones JHI-III. The
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::236a490a3b45619354b1cf76c3cf340a
https://doi.org/10.1002/recl.19811000702
https://doi.org/10.1002/recl.19811000702
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 96:168-171
Halogenation of vinylcopper(I) compounds [RR′CCHCu(Br or R)]MgX, prepared stereospecifically by cis-addition of [RCuBr]MgX or [R2Cu]MgX to 1-alkynes R′-C≡CH in tetrahydrofuran, with one of the halogenating reagents N-chlorosuccinimide, N-bromos
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::44fc0d83b7e746aec0ce1a87c29481b2
https://doi.org/10.1002/recl.19770960607
https://doi.org/10.1002/recl.19770960607
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 102:154-157
Two epimeric steroidal allenes, 1 and 2, have been interconverted by reaction with Me2CuMgCl and Me2CuLi. MeCu could also be used, although in this case the isomerisation was much slower. The 1,4-disubstituted butatrienes 6 and 8 have also been isome
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5dbd9554c1900a35d2439ed7c319bc05
https://doi.org/10.1002/recl.19831020306
https://doi.org/10.1002/recl.19831020306
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 99:340-343
The paper describes the preparation of a number of symmetrically substituted 1,3-dienes H2C=C(R)-C(R)=CH2 (3a-d) as well as non-symmetrically substituted 1,3-dienes H2C=C(R1)-C(R)=CR2R3 (3e-i, R ≠ R1) by means of organocuprate induced SN2′ reacti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0af4ebc1d39bdc540cbc170a063d42db
https://doi.org/10.1002/recl.19800991104
https://doi.org/10.1002/recl.19800991104
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 100:98-102
The paper describes reactions of 1-alkynes, R1-C≡C-H, with new cuprate species of the type R3Cu2M [M = Mg(Cl, Br)]. Under suitably chosen conditions a smooth transfer of R (Me or Et) from the cuprates to the 1-alkynes (R1 = Ph or n-C6H13) could be
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5f4caea77c90dc1bf704fd765340796f
https://doi.org/10.1002/recl.19811000305
https://doi.org/10.1002/recl.19811000305
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 95:299-303
Homocuprates [RCuR”]MgX, 1 (R = alkyl; R” = R or BuC≡C) appeared to be useful reagents for the introduction of an R group into 1-alkynes R′−C≡C−H 2 (R′ = Ph, H, alkyl) in tetrahydrofuran as a solvent. Depending on R and R′ terminal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0526dffd944291f078bd73caefdcd337
https://doi.org/10.1002/recl.19760951205
https://doi.org/10.1002/recl.19760951205
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 98:27-31
The sulfinates (E)-R1-C≡C-C(R2, CH=CHR3)-OS(O)Me (1) have been treated with [R4CuBr]MgX·LiBr (4) in tetrahydrofuran. The ratio allylic versus propargylic 1,3-substitution in 1, leading to R1-C≡C-CR2=CH-CHR3R4 (2, Z/E ≥ 86/14) and (E)-R1R4C=C=C
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ea5053cd4b768b0665bd86fa10cd74f6
https://doi.org/10.1002/recl.19790980202
https://doi.org/10.1002/recl.19790980202
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 101:405-409
An extensive study of the reactivity of organometallic reagents R3M (R3 = 1-alkenyl, 1-alkynyl, 3-alken-1-ynyl, 1,3-alkadiynyl or 1,2-alkadienyl; M = Li, MgCl, ZnCl, Cu, Ag) towards R1R2CCCH-X (1) and R1R2C(X)-CCH (4) is described. High yields of R1R
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7dd53a954793dfe90d64002d1f5b57ef
https://doi.org/10.1002/recl.19821011107
https://doi.org/10.1002/recl.19821011107
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 102:378-380
The smooth conversion of the readily available compounds, H2C=C(OMe)-CR2′-X (1; X = OC(O)Me or OS(O)Me), with R-ZnCl reagents, using Pd[PPh3]4 as catalyst, is described. It is shown that via this route several 3-methoxy-1,3-dienes H2C=C(R)-C(O)Me)=
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::30c0c1743c166eae2ec20afd08ce4b1e
https://doi.org/10.1002/recl.19831020709
https://doi.org/10.1002/recl.19831020709
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 97:56-58
In tetrahydrofuran tertiary 2-propynyl sulfinates R1-C≡C-C(R2,R3)-OS(O)Me (1) are smoothly converted in a 1,3-substitution reaction into allenic hydrocarbons RR1CCCR2R3(4) by organoheterocuprates of the type (RCuBr)MgX. Generally, much attack on th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e0bf4d7adcef2a8e50cb87104ca72e4a
https://doi.org/10.1002/recl.19780970209
https://doi.org/10.1002/recl.19780970209