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D. Van Leusen

University of Groningen

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Acta Crystallographica Section C-crystal Structure Communications | 1993

STRUCTURE OF 17-(3-OXAZOLIN-4-YL)ANDROSTA-4,16-DIEN-3-ONE

A. Meetsma; D. Van Leusen; A. M. Van Leusen

17-(2,5-Dihydro-3-oxazol-4-yl)androsta-4,16-dien-3-one, C22H29NO2, M(r) = 339.48, orthorhombic, P2(1)2(1)2(1), a = 7.715 (5), b = 12.033 (1), c = 19.199 (1) angstrom, V = 1782.3 (1) angstrom3, Z = 4, D(x) = 1.265 g cm-3, lambda(Mo KalphaBAR) = 0.71073 angstrom, mu = 0.7 cm-1, F(000) = 736, T = 130 K, R(F) = 0.044 for 1984 unique reflections with I greater-than-or-equal-to 2.5sigma(I) and 343 parameters. In the crystalline state, the conjugated double-bond system of the D ring of the steroid skeleton and the oxazoline ring apparently adopt a transoid configuration.

Zeitschrift für anorganische und allgemeine Chemie | 2006

Mono(amidinate) yttrium alkyl complexes: The effect of ligand variation on ethene polymerization catalysis

S. de Araujo Bambirra; Edwin Otten; D. Van Leusen; Auke Meetsma

Dalton Transactions | 2006

Neutral versus cationic Group 3 metal alkyl catalysts

Sergio Bambirra; H. Tsurugi; D. Van Leusen

ChemInform | 2010

Chemistry of Sulfonylmethyl Isocyanides. Part 40. Synthesis of 17‐(2‐ Methoxy‐3‐oxazolin‐4‐yl)‐, 17‐(3‐Oxazolin‐4‐yl)‐, and 17‐(2‐Oxazolin‐4‐ ylidene)‐Substituted Steroids and Their Use as Precursors of Corticosteroids.

D. Van Leusen; J. N. M. Batist; J. Lei; E. Van Echten; A. C. Brouwer; A. M. Van Leusen

ChemInform | 1992

Chemistry of Sulfonylmethyl Isocyanides. Part 36. Studies on the Conversion of 3,3-Dimethyl-2-butanone Into Geminal Isocyano Tosyl Alkenes.

D. Van Leusen; A. M. Van Leusen

ChemInform | 1992

Chemistry of Sulfonylmethyl Isocyanides. Part 33. Synthesis of 17-( Isocyanotosylmethylene) Steroids: Precursors to Pregnane Derivatives.

D. Van Leusen; A. M. Van Leusen

ChemInform | 1985

CHEMISTRY OF SULFONYLMETHYL ISOCYANIDES. 28. ON THE SYNTHESIS OF 1,N-DIKETONES USING MONO-SUBSTITUTED DERIVATIVES OF TOSYLMETHYL ISOCYANIDE

A. M. Van Leusen; R. Oosterwijk; E. Van Echten; D. Van Leusen

ChemInform | 1984

REARRANGEMENTS OF YLIDES GENERATED FROM REACTIONS OF DIAZO COMPOUNDS WITH ALLYL ACETALS AND THIOKETALS BY CATALYTIC METHODS. HETEROATOM ACCELERATION OF THE (2,3)-SIGMATROPIC REARRANGEMENT

Michael P. Doyle; John H. Griffin; Mitchell S. Chinn; D. Van Leusen

ChemInform | 1984

CHEMISTRY OF SULFONYLMETHYL ISOCYANIDES. 25. SYNTHESIS OF ARYLSULFONIMIDOYL FLUORIDES AND THEIR USE IN THE PREPARATION OF (ARYLSULFONIMIDOYL)METHYL ISOCYANIDES. PARTIAL RESOLUTION OF OPTICALLY ACTIVE S-PHENYL-N-TOSYLSULFONIMIDOYL FLUO

D. Van Leusen; A. M. Van Leusen

ChemInform | 1984

CHEMISTRY OF SULFONYLMETHYL ISOCYANIDES. 26. A NOVEL METHOD TO BUILD ACETYL AND HYDROXYACETYL SIDE CHAINS IN 17-OXOSTEROIDS

D. Van Leusen; A. M. Van Leusen

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A. M. Van Leusen

University of Groningen

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Michael P. Doyle

University of Arizona

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A. C. Brouwer

University of Groningen

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A. Meetsma

University of Groningen

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Auke Meetsma

University of Groningen

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B. A. Reith

University of Groningen

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B. E. Hoogenboom

University of Groningen

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E. Van Echten

University of Kansas

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Edwin Otten

University of Groningen

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J. Lei

University of Groningen

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