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CRYSTAL AND MOLECULAR STRUCTURES OF TWO DITHIENO-(1,4)-DITHIINS, C8H4S4HIEMSTRA H; KIERS CT.1979; ACTA CRYSTALLOGR., B; DNK; DA. 1979; VOL. 35; NO 5; PP. 1140-1143; BIBL. 17 REF.Article

INFLUENCE OF "FLOATING" PARALLEL ALIGNMENT ON LUEDERS BAND CONFIGURATIONS = INFLUENCE D'UN ALIGNEMENT "FLOTTANT" SUR LA CONFIGURATION DES BANDES DE LUEDERSSLEESWYK AW; HIEMSTRA H.1980; SCR. METALL.; ISSN 0036-9748; USA; DA. 1980; VOL. 14; NO 8; PP. 915-918; BIBL. 2 REF.Article

DETERMINATION OF THE ENANTIOMERIC PURITY OF CHIRAL KETONES USING 13C NMR SPECTROSCOPY OF THEIR DIASTEREOMERIC CYCLIC KETALS.HIEMSTRA H; WYNBERG H.1977; TETRAHEDRON LETTERS; G.B.; DA. 1977; NO 25; PP. 2183-2186; BIBL. 12 REF.Article

COMPLETELY REGIOSELECTIVE ALPHA -ACYLIMINIUM ION CYCLISATIONS WITH ALLYL AND PROPARGYL SILANESHIEMSTRA H; SPECKAMP WM.1983; TETRAHEDRON LETTERS; ISSN 0040-4039; GBR; DA. 1983; VOL. 24; NO 13; PP. 1407-1410; BIBL. 16 REF.Article

ION PAIR EFFECTS IN AN INTERCALATION PROCESS. AN APPROACH TO THE BICYCLO (5.3.1) UNDECYL SYSTEM OF TAXANETROST BM; HIEMSTRA H.1982; J. AM. CHEM. SOC.; ISSN 0002-7863; USA; DA. 1982; VOL. 104; NO 3; PP. 886-887; BIBL. 17 REF.Article

ADDITION OF AROMATIC THIOLS TO CONJUGATED CYCLOALKENOMES, CATALUZED BY CHIRAL BETA -HYDROXYAMINES. A MECHANISTIC STUDY ON HOMOGENEOUS CATALYTIC ASYMMETRIC SYNTHESISHIEMSTRA H; WYNBERG H.1981; J. AM. CHEM. SOC.; ISSN 0002-7863; USA; DA. 1981; VOL. 103; NO 2; PP. 417-430; BIBL. DISSEM.Article

ASYMMETRIC INDUCTION IN THE BASE-CATALYSED MICHAEL ADDITION OF NITROMETHANE TO CHALCONE.COLONNA S; HIEMSTRA H; WYNBERG H et al.1978; J. CHEM. SOC., CHEM. COMMUNIC.; G.B.; DA. 1978; NO 6; PP. 238-239; BIBL. 6 REF.Article

Synthetic studies toward taxanes. A sulfur based approach to the benzilic acid rearrangementTROST, B. M; HIEMSTRA, H.Tetrahedron (Oxford. Print). 1986, Vol 42, Num 12, pp 3323-3332, issn 0040-4020Article

CARBON-13 NUCLEAR MAGNETIC RESONANCE SPECTRA OF OXAZOLESHIEMSTRA H; HOUWING HA; POSSEL O et al.1979; CAN. J. CHEM.; ISSN 0008-4042; CAN; DA. 1979; VOL. 57; NO 23; PP. 3168-3170; ABS. FRE; BIBL. 12 REF.Article

NON-POLIO ENTEROVIRUS ACTIVITY IN WISCONSIN BASED ON A 20-YEAR EXPERIENCE IN A DIAGNOSTIC VIROLOGY LABORATORYNELSON D; HIEMSTRA H; MINOR T et al.1979; AMER. J. EPIDEMIOL.; USA; DA. 1979; VOL. 109; NO 3; PP. 352-361; BIBL. 14 REF.Article

Intramolecular reactions of N-acyliminium intermediatesSPECKAMP, W. N; HIEMSTRA, H.Tetrahedron (Oxford. Print). 1985, Vol 41, Num 20, pp 4367-4416, issn 0040-4020Article

ALKALOID CATALYZED ASYMMETRIC SYNTHESIS. III. THE ADDITION OF MERCAPTANS TO 2-CYCLOHEXENE-1-ONE; DETERMINATION OF ENANTIOMERIC EXCESS USING 13C NMR.HELDER R; ARENDS R; BOLT W et al.1977; TETRAHEDRON LETTERS; G.B.; DA. 1977; NO 25; PP. 2181-2182; BIBL. 7 REF.Article

Oxazinone versus allene formation in the reaction of N-alkoxycarbonyliminium ions with propargyltrimethylsilaneESCH, P. M; HIEMSTRA, H; SPECKAMP, W. N et al.Tetrahedron letters. 1988, Vol 29, Num 3, pp 367-370, issn 0040-4039Article

(R)-1-Acetyl-5-isopropoxy-3-pyrrolin-2-one : a versatile chiral dienophile from (S)-malic acidKOOT, W.-J; HIEMSTRA, H; SPECKAMP, W. N et al.Journal of organic chemistry. 1992, Vol 57, Num 4, pp 1059-1061, issn 0022-3263Article

Stereoselective synthesis of enantiopure 4,5-disubtituted pyrrolidin-2-ones by consecutive cuprate addition and N-acyliminium couplingKOOT, W.-J; HIEMSTRA, H; SPECKAMP, W. N et al.Tetrahedron letters. 1992, Vol 33, Num 51, pp 7969-7972, issn 0040-4039Article

Synthesis of cyclic α-amino acids through ring closure of glycine derived free radicalsESCH, P. M; HIEMSTRA, H; SPECKAMP, W. N et al.Tetrahedron letters. 1990, Vol 31, Num 5, pp 759-762, issn 0040-4039Article

Silicon-assisted synthesis of bridged azabicyclic systems via N-acyliminium intermediatesKLAVER, W. J; HIEMSTRA, H; SPECKAMP, W. N et al.Tetrahedron (Oxford. Print). 1988, Vol 44, Num 21, pp 6729-6738, issn 0040-4020Article

Regioselective synthesis of (+)-gabaculineHIEMSTRA, H; KLAVER, W. J; SPECKAMP, W. N et al.Tetrahedron letters. 1986, Vol 27, Num 12, pp 1411-1414, issn 0040-4039Article

Lewis acid induced reactions of propargyl trimethyl silane with ω-ethoxy lactams synthesis of γ-allenyl-GABAHIEMSTRA, H; FORTGENS, H. P; SPECKAMP, W. N et al.Tetrahedron letters. 1984, Vol 25, Num 29, pp 3115-3118, issn 0040-4039Article

ω-Alkoxy lactams as dipolar synthons: silicon-assisted synthesis of azabicycles and a γ-amino acidHIEMSTRA, H; KLAVER, W. J; SPECKAMP, W. N et al.Journal of organic chemistry. 1984, Vol 49, Num 6, pp 1149-1151, issn 0022-3263Article

Conjugate addition of amines and thiols to (R)-1-acetyl-5-isopropoxy-3-pyrrolin-2-one ; preparation of enantiopure N-acyliminium ion precursorsWIM-JAN KOOT; HIEMSTRA, H; SPEKAMP, W. N et al.Tetrahedron : asymmetry (Print). 1993, Vol 4, Num 8, issn 0957-4166, XI, 1941-1948 [11 p.]Article

Diastereoselective alkylation of the dianion of 5-ethoxy-4(S)-hydroxy-1-isopropyl-2-pyrrolidinone; synthesis of enantiomerically pure azabicyclesKLAVER, W. J; HIEMSTRA, H; SPECKAMP, W. N et al.Tetrahedron letters. 1987, Vol 28, Num 14, pp 1581-1584, issn 0040-4039Article

Intramolecular reactions of acyclic N-acyliminium ions. II: Allyl silanes as nucleophilesHIEMSTRA, H; FORTGENS, H. P; SPECKAMP, W. N et al.Tetrahedron letters. 1985, Vol 26, Num 26, pp 3155-3158, issn 0040-4039Article

Diffusion of oxygen in alginate gels related to the kinetics of methanol oxidation by immobilized Hansenula polymorpha cells = Diffusion de l'oxygène dans des gels d'alginate en rapport avec la cinétique de l'oxydation du méthanol par des cellules immobilisées de H. pHIEMSTRA, H; DIJKHUIZEN, L; HARDER, W et al.European journal of applied microbiology and biotechnology. 1983, Vol 18, Num 4, pp 189-196, issn 0171-1741Article

Stereochemistry of allylic alkylation of the tetracarbonyliron complexes of (R)-1-acetyl-5-isopropoxy-3-pyrrolin-2-oneWIN-JAN KOOT; HIEMSTRA, H; SPECKAMP, W. N et al.Journal of the Chemical Society. Chemical communications. 1993, Num 2, pp 156-158, issn 0022-4936Article

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