K. Lempert

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CONDENSED 1,3,5-TRIAZEPINES - IV THE SYNTHESIS OF 2,3-DIHYDRO-1H-IMIDAZO-[1,2-a] [1,3,5] BENZOTRIAZEPINES

K. Lempert, B. Ágai, G. Hornyak, 1983 .

CONDENSED 1,3,5-TRIAZEPINES - V THE SYNTHESIS OF PYRAZOLO [1,5-a] [1,3,5]-BENZOTRIAZEPINES

Béla Ágai, Károly Lempert, Gyula Hornyak, 1983 .

The reaction of triphenylmethyl bromide with potassium O-ethyl dithiocarbonate (potassium xanthate) in benzene and cumene. A note of caution on the application of the radical trap dicyclohexylphosphine as a probe for electron-transfer-initiated reactions of triphenylmethyl halides

K. Lempert, A. Rockenbauer, P. Huszthy, 1990 .

Allenes and Acetylenes. XVIII. Synthesis of 3-Pyrrolines by Silver(I)-catalyzed Cyclization of Allenic Amines.

K. Lempert, J. Møller, K. Luthman, 1979 .

The reaction of triphenylmethyl halides with triphenylphosphine in cumene and tert-butylbenzene

K. Lempert, P. Huszthy, M. Kajtár-Peredy, 1992 .

The reaction of triphenylmethyl halides with tributylphosphine and tributylamine in apolar solvents

K. Lempert, A. Rockenbauer, P. Huszthy, 1989 .

The reaction of α-chloro-α,α-diphenylacetamides with potassium n-cyanoanilide

K. Lempert, G. Simig, 1975 .

Simple and condensed β-lactams. Part 33. AlCl3 catalyzed ring closures of some 3-aryloxy-4-oxoazetidine-2-carboxylic chlorides to 1H-chromeno[3,2-b]azete-2,8(2aH,8aH)-diones and some reactions of the products

K. Lempert, J. Fetter, F. Bertha, 1999 .

The synthesis and some reactions OF 3-(2-aminophenyl)-2-iminothiazolidines. ring closure of -(2-thiocyanaoethyl,)-phenylenediamines; thiazolidine . 3,1,6-benzothiadiazocine formation

K. Lempert, G. Hornyak, F. Bertha, 1990 .

Oxidative cyclization by lead(IV) acetate of 1-(4-methoxyphenyl)-4-(tetrazol-5-ylmethyl)azetidin-2-ones to 3-methoxy-9,9a-dihydroazeto[1,2-a]tetrazolo-[5,1-d][1,5]benzodiazepin-11(10H)-ones and related reactions

K. Lempert, T. Czuppon, G. Czira, 1999 .

The reaction of N-cyanoamines with 1-(t-butyl)-3,3-diphenylaziridinone: A general method for the synthesis of 1-alkyl-, 1-aralkyl- and 1-aryl-5,5-diphenylhydantoins and -glycocyamidines

K. Lempert, G. Simig, G. Czira, 1975 .

Hydantoins, thiohydantoins, glycocyamidines. The reaction of the 3-methyl-2,5-bis/methylthio/-4,4-diphenyl-4H-imidazolium cation with simple potential carbanions. A novel S-dealkylation reaction of a cyclic ISO-thiuronium compound

K. Lempert, K. Zauer, 1964 .

N-(6,7-methylenedioxy-3-quinazolinio)amidates—I synthesis spectra and some dark reactions

K. Lempert, J. Møller, J. Fetter, 1975 .

Simple and condensed β-lactams. Part 27. Reaction of 1-(4-methoxyphenyl)-4-(tetrazol-5-yl)azetidin-2-one and 1-(4-methoxyphenyl)-5-(tetrazol-5-yl-methyl)pyrrolidin-2-one with Cerium(IV) ammonium nitrate (CAN)

K. Lempert, Á. Gömöry, J. Fetter, 1996 .

Simple and condensed β-lactams. Part 5. The synthesis of some (5RS,6SR)-2-(2-formylaminoethylthio)-6-(2-methyl-1,3-dioxolan-2-yl)carbapenem-3-carboxylic acid derivatives and related compounds

K. Lempert, G. Hornyak, G. Simig, 1986 .

Simple and condensed β-lactams. Part 7. Side chain extensions of some azetidin-2-one derivatives, and the formation of melillo's lactone, a strategic intermediate in the total synthesis of thienamycin, from 3-acetyl-1-benzyl-4-cyanomethylazetidin-2-one

K. Lempert, G. Hornyak, G. Simig, 1986 .

Simple and Condensed β-Lactams. Part 33. AlCl3 Catalyzed Ring Closures of Some 3-Aryloxy-4-oxoazetidine-2-carboxylic Chlorides to 1H-Chromeno[3,2-b]azete-2,8(2aH,8aH)-diones and Some Reactions of the Products.

K. Lempert, J. Fetter, F. Bertha, 1999 .

Simple and condensed β-lactams, part 31. Acid catalyzed ring closures and ring transformations of some 3-aryloxy-4-oxoazetidine-2-carbaldehydes

K. Lempert, G. Czira, J. Fetter, 1998 .

Simple and condensed β-lactams-I : The application of diketene in β-lactam synthesis. The synthesis and functional group manipulations of diethyl 3-acetyl-4-oxoazetidine-2,2-dicarboxylates

K. Lempert, G. Hornyak, G. Simig, 1985 .

On the anomalous behaviour of certain 1-(4-methoxyphenyl)azetidin-2-ones towards cerium(IV) ammonium nitrate (CAN). Structure-reactivity studies

K. Lempert, G. Keserű, J. Fetter, 1996 .

Simple and condensed β-lactams. Part 22. An unprecedented ring transformation accompanying dephthaloylation of a 3-phthalimidoazetidin-2-one

K. Lempert, G. Czira, J. Fetter, 1995 .

The annular desmotropy of S-methyl-5,5-diphenyl-2-thiohydantoin

K. Lempert, P. Sohár, A. Kălmăn, 1973 .

Alkaline cleavage of some (1-phenylsulfonyl-2-pyrazolin-5-yl)-methyl ketones and related compounds

K. Lempert, M. Lempert-Sre´ter, 1975 .

Benzoxadiazocines, benzothiadiazocines and benzotriazocines—I : General considerations and the synthesis of two 3,1,6-benzoxadiazocines

K. Lempert, G. Hornyak, 1983 .

Synthesis of Pyrroles and a 1,2-Dihydropyrrolo[1,2-a]pyrazin-3(4H)-one Identified as Maillard Reaction Products.

K. Lempert, J. Møller, K. Luthman, 1979 .

Rearrangement of N-cyano-anthranilic acids to 1,2-dihydro-2-imino-3,1,4H-benzoxazin-4-ones and 2,4(IH,3H)-quinazoline-diones. Reactions of 1,2-dihydro-2-imino-3,1,4H-benzoxazin-4-one with hydroxylic reagents.

K. Lempert, G. Doleschall, 1963 .

Condensed 1,3,5-triazepines-II. The synthesis of 2,3-dihydro-1H-imidazo[1,2-a] [1,3,5]benzotriazepin-5(6H)-ones and -thiones

K. Lempert, B. Ágai, G. Hornyak, 1976 .

The reduction of triarylcarbenium ions by n-nucleophiles. The operation of the intramolecular version of the Olah–Svoboda mechanism in the reductive cyclization of the tris-(2,6-dimethoxyphenyl)carbenium ion

K. Lempert, G. Simig, P. Huszthy, 1985 .

The reduction of triarylcarbenium ions by alcohols: simple hydride transfer or concerted breakdown of ortho-adducts ?

K. Lempert, G. Simig, P. Huszthy, 1982 .

The reaction of tris(4-methoxyphenyl)methyl chloride with sodium methoxide—non-operation of single electron transfer pathways

K. Lempert, G. Simig, K. Vékey, 1982 .

Relative migratory aptitudes of hydrogen, benzoyl, 4-methoxyphenyl and 4-nitrophenyl groups in some unsaturated carbenes (vinylidenes)

K. Lempert, G. Czira, J. Fetter, 2001 .

Assignment for vibrational spectra of seven hundred benzene derivatives

K. Lempert, G. Varsányi, L. Láng, 1974 .

Observations on Silver Trifluoromethane Sulfonate-promoted Syntheses of 1,2-trans-Glycosides from Acylated Glycosyl Bromides.

K. Lempert, J. Møller, N. Yanaihara, 1979 .

1,2,4-triazines and condensed derivatives—XVI : 1-oxo-1,2-dihydro- and 1-oxo-1,2,6,7-tetrahydro[1,2,4]triazino[1,6-c]-quinazolin-5-ium salts. Synthesis and some reactions☆☆☆

K. Lempert, G. Doleschall, 1976 .

The reaction of 2,5,5-triphenyl-2-oxazolin-4-one with phosphorus pentasulfide

K. Lempert, E. Koltai, 1973 .

1,2,4-triazines and condensed derivatives—XIV

K. Lempert, G. Doleschall, 1974 .

Electron deficient heteroaromatic ammonioamidates—XVI: The synthesis and photochemistry of ethyl N-(2-methyl-4-methylene-6,7-methylenedioxy- 3,4-dihydro-3-quinazolinyl)-N-phenylcarbamate

K. Lempert, J. Møller, J. Fetter, 1978 .

K. Lempert, G. Hornyak, G. Simig, 2001 .

N-Quaternary Compounds. Part LIV. Isomerization by Flash Vacuum Pyrolysis.

K. Lempert, J. Møller, N. Yanaihara, 1979 .

Simple and condensed β-lactams. Part 13. Synthesis of some 1-(3-acylamino-2-oxoazetidin-1-yl)-cyclopentane- and -cyclohexanecarboxylic acids

K. Lempert, P. Sohár, J. Nagy, 1992 .

Synthesis, Structure and Stability of Nicotine Delta1'(5') Iminium Ion, an Intermediary Metabolite of Nicotine.

K. Lempert, J. Møller, N. Yanaihara, 1979 .

Infrared absorption of substituents—XI

K. Lempert, A. Katritzky, J. Puskas, 1969 .

C-Alkylation of Pyrimidines by an Oxoalkyl Reactant.

K. Lempert, J. Møller, N. Yanaihara, 1979 .

On the anomalous behaviour of (3RS,4RS)-[(2RS)-3-acetylthiazolidin-2-yl]-1-(4-methoxyphenyl)azetidin-2-ones towards cerium(IV) ammonium nitrate (CAN). An unprecedented oxidative ring transformation.

K. Lempert, G. Keserű, L. Párkányi, 1993 .

Acetoxylation of β-lactams with lead(IV) acetate

K. Lempert, G. Czira, J. Fetter, 1999 .

Simple and Condensed β-Lactams. Part 35. Acetoxylation of β-Lactams with Lead(IV) Acetate.

K. Lempert, G. Czira, J. Fetter, 2000 .

Condensed 1,3,5-triazepines-III. Derivatives of 4,5-dihydro-[1,3,5]triazepino[1,2-a]benzimidazole

K. Lempert, B. Ágai, G. Hornyak, 1976 .

A novel rearrangement reaction of 2,5,5-triaryl-2-thiazolin-4-ones during thiation

K. Lempert, G. Horváth, A. Kălmăn, 1973 .

The synthesis of (3,4,5,6-tetrahydro-4-oxo-2h-1,3-thiazin-2-yl)-alkanoic acids, their derivatives and some related compounds

K. Lempert, G. Hornyak, I. Koczka, 1978 .

The Crystal and Molecular Structure of 1-(beta-Aminoethyl)-4-hydroxy-5-iodo-3,6-benzoquinone, an Oxidation Product of 6-Hydroxydopamine.

K. Lempert, J. Møller, N. Yanaihara, 1979 .

Simple and condensed β-lactams. Part 20. Reaction of some 1-(4-methoxyphenyl)azetidin-2-ones with cerium(IV) ammonium nitrate (CAN): Trapping of the quinone imine intermediate with chloride and iodide anions

K. Lempert, T. Czuppon, G. Czira, 1994 .

Simple and condensed β-lactams. Part 14. Anomalous behaviour of 1-(4-methoxyphenyl)-4-(tetrazol-5-ylmethyl)azetidin-2-one towards cerium(IV) ammonium nitrate

K. Lempert, T. Czuppon, E. Keskeny, 1992 .

Simple and Condensed β-Lactams. Part 14. Anomalous Behavior of 1-( 4-Methoxyphenyl)-4-(tetrazol-5-ylmethyl)azetidin-2-one Towards Cerium( IV) Ammonium Nitrate.

K. Lempert, T. Czuppon, E. Keskeny, 1993 .