Výsledky vyhledávání - "L. A. Van Dijck"

Microbiological conversion of 19-nortestosterone: (V) 6β- and 14α-hydroxylation

Autor: W. J. Mijs, J. de Flines, W. F. van der Waard, L. A. Van Dijck, S. A. Szpilfogel

Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 82:149-156

Fermentation of 19-nortestosterone with Curvularia lunata or with Botrytis paeoniae yielded mainly the 10β-hydroxy-derivative. Fermentation with Aspergillus ochraceus afforded the 11α-hydroxy-derivative in good yield. 10β-Hydroxy-19-nortestosteron

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::feb427f6b7bf9b4dee93bdef1cf06e24
https://doi.org/10.1002/recl.19630820207

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Microbiological conversion of 19-nortestosterone: (III) 12-hydroxylation

Autor: J. de Flines, W. F. van der Waard, W. J. Mijs, L. A. van Dijck, S. A. Szpilfogel

Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 82:139-142

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5723946d1354d7dd4214f2cb4054aca8
https://doi.org/10.1002/recl.19630820205

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A new synthesis of allenic hydrocarbons from tertiary 2-propynyl sulfinates and organocopper(I) compounds. Evidence for a syn-l,3-substitution pattern in the steroid series

Autor: Henk Kleijn, Peter Vermeer, L. A. Van Dijck, Hans Westmijze

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

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On the formation of allenes in the steroid series IV. Synthesis and structure of several 3-methoxy-19-nor-1,3,5(10)-17(20), 20-pregnapentaenes, substituted at C(21)

Autor: J. C. G. M. Vermeer, L. A. Van Dijck, B. J. Lankwerden

Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 98:553-559

Pairs of steroid 17(20),20-allenes, epimeric at C(21), have been obtained by LiAlH4(D4)/AlCl3 reduction of 17α/β-hydroxy-17β/α-alkynyl steroids, confirmed by means of optical rotation differences and NMR spectroscopy. In all cases the reduction p

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ad6ba713088523269d90ddd9c035b446
https://doi.org/10.1002/recl.19790981202

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On the formation of allenes in the steroid series III.: Synthesis and reactions of 3-methoxy-17α-hydroxy-17β-ethynyl-1,3,5(10)-estratriene ('epimestranol')

Autor: B. J. Lankwerden, L. A. Van Dijck, J. G. C. M. Vermeer

Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 96:200-206

“Epimestranol” (6) has been prepared from the 16α,17-epoxide 5 by reduction with LiAlH4. The structures of several by-products have been elucidated and a mechanism for their formation is discussed. Both “mestranol” (3) and “epimestranol”

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7fb56960023d72f188d654859729ac0d
https://doi.org/10.1002/recl.19770960708

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On the formation of allenes in the steroid series II. Synthesis and structure of several 19-nor-17,20-pregnadienes

Autor: B. J. Lankwerden, A. J. M. Weber, L. A. Van Dijck, J. G. C. M. Vermeer

Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 90:801-818

A number of 19-nor-pregnane derivatives bearing a 17,20-diene side-chain has been synthesized; the stereochemistry of the products formed during the preparation of non-substituted, mono- and dimethyl allenes has been studied by means of application o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6afeb51b6b7ecbfd76d9d958601f002a
https://doi.org/10.1002/recl.19710900713

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