Jens Winkler - Academia.edu (original) (raw)
Papers by Jens Winkler
![Research paper thumbnail of Gas phase pyrolysis of heterocyclic compounds, part 4: flow pyrolysis and annulation reactions of some oxygen heterocycles: furan, benzo[b]furan and dibenzofuran. A product oriented study](https://attachments.academia-assets.com/71675302/thumbnails/1.jpg)
](Journal of Analytical and Applied Pyrolysis, 2001
Continuous flow pyrolysis (CFP) of furan (1), benzo[b]furan (2) and dibenzofuran (3) has been inv... more Continuous flow pyrolysis (CFP) of furan (1), benzo[b]furan (2) and dibenzofuran (3) has been investigated at 900°C. Complete decomposition of 1 and 2 was observed, while 3 proved to be more temperature resistant. In the pyrolysates of 1-3, up to 22 different products were identified by GC-MS, 12 of these are identical. Mainly polycyclic aromatic hydrocarbons (PAHs), such as naphthalene (11) (6-28%), phenanthrene (17) (2-25%), biphenyl (22) (1-11%), pyrene (18) (1-10%), benzopyrene (19) (1-10%), fluoranthene (20) (3-9%), triphenylene (21) (3-9%), acenaphthylene (13) (1-6%), anthracene (23) (1-6%) and fluorene (12) (1-3%), were obtained. Only from 3, small amounts of larger oxygen containing polycyclic hetarenes (PHAs), such as benzo[b]naphtho[2,3-d]furan (37) and benzo[1,2b:4,5-b%]bis[1]benzofuran (36), are generated as additional products besides PAHs.
![Research paper thumbnail of Gas-phase pyrolysis of heterocyclic compounds, part 1 and 2: flow pyrolysis and annulation reactions of some sulfur heterocycles: thiophene, benzo[b]thiophene, and dibenzothiophene. A product-oriented study](https://attachments.academia-assets.com/71675298/thumbnails/1.jpg)
](Journal of Analytical and Applied Pyrolysis, 2002
Continuous flow pyrolysis (CFP) of thiophene (1), benzo[b]thiophene (2), and dibenzothiophene (3)... more Continuous flow pyrolysis (CFP) of thiophene (1), benzo[b]thiophene (2), and dibenzothiophene (3) was investigated. 1 and 2 were studied in the temperature range 500-1100°C. Up to about 20 products were identified by GC-MS and their temperature profiles determined. 3 was pyrolysed at 900°C. All together, more than 30 products were identified in the pyrolysates, the largest number was found for 2. A distinct tendency to form polycyclic aromatic hydrocarbons (PAHs) and sulfur-containing polycyclic hetarenes (PHAs), even with more than one sulfur atom, is observed. At temperatures below 800°C, mainly 'oligomers' of the educts arise by radical recombination reactions. Above 800°C, fragmentation of the skeleton becomes important, and products are generated from the starting molecules and their fragments. From 1, PHAs such as benzo[b]thiophene (2, 29%), dibenzothiophene (3, 11%), and thianthrene (22, 4%), and from 2, PHAs such as benzo[b]naphtho[2,1-d]thiophene (32, 13%) and [1]benzothieno[2,3-b][1]benzothiophene (21, 5%) are formed in highest amounts at 850-900°C. Minor amounts of highly annulated thiophenes such as triphenyleno[1,1a,1b,2-b,c,c]thiophene (28) and benzo[1,2-b:3,4-b%:6,5-b¦]tri(benzo[b]thiophene) (36), are detected. Formation of PAHs such as benzene (4), naphthalene (5), phenanthrene (7), fluoranthene (8), and pyrene (9) increases rapidly above 850°C. Product formation
4.1 Pyrolyse fünfgliedriger stickstoffhaltiger Hetarene 11 4.1. 1 Pyrolyse von Pyrrol (7) 11 4.1.... more 4.1 Pyrolyse fünfgliedriger stickstoffhaltiger Hetarene 11 4.1. 1 Pyrolyse von Pyrrol (7) 11 4.1. 1.1 Produktverteilung 11 4.1. 1.2 Fragmentierung und Anellierung 12 4.1. 1.3 Diskussion 16 4.1. 2 Pyrolyse von Indol (8) 16 4.1. 2.1 Produktverteilung 16 4.1. 2.2 ...
Journal of Analytical and Applied Pyrolysis, 2001
Continuous flow pyrolysis (CFP) of furan (1), benzo[b]furan (2) and dibenzofuran (3) has been inv... more Continuous flow pyrolysis (CFP) of furan (1), benzo[b]furan (2) and dibenzofuran (3) has been investigated at 900°C. Complete decomposition of 1 and 2 was observed, while 3 proved to be more temperature resistant. In the pyrolysates of 1-3, up to 22 different products were identified by GC-MS, 12 of these are identical. Mainly polycyclic aromatic hydrocarbons (PAHs), such as naphthalene (11) (6-28%), phenanthrene (17) (2-25%), biphenyl (22) (1-11%), pyrene (18) (1-10%), benzopyrene (19) (1-10%), fluoranthene (20) (3-9%), triphenylene (21) (3-9%), acenaphthylene (13) (1-6%), anthracene (23) (1-6%) and fluorene (12) (1-3%), were obtained. Only from 3, small amounts of larger oxygen containing polycyclic hetarenes (PHAs), such as benzo[b]naphtho[2,3-d]furan (37) and benzo[1,2b:4,5-b%]bis[1]benzofuran (36), are generated as additional products besides PAHs.
Journal of Analytical and Applied Pyrolysis, 2002
Continuous flow pyrolysis (CFP) of thiophene (1), benzo[b]thiophene (2), and dibenzothiophene (3)... more Continuous flow pyrolysis (CFP) of thiophene (1), benzo[b]thiophene (2), and dibenzothiophene (3) was investigated. 1 and 2 were studied in the temperature range 500-1100°C. Up to about 20 products were identified by GC-MS and their temperature profiles determined. 3 was pyrolysed at 900°C. All together, more than 30 products were identified in the pyrolysates, the largest number was found for 2. A distinct tendency to form polycyclic aromatic hydrocarbons (PAHs) and sulfur-containing polycyclic hetarenes (PHAs), even with more than one sulfur atom, is observed. At temperatures below 800°C, mainly 'oligomers' of the educts arise by radical recombination reactions. Above 800°C, fragmentation of the skeleton becomes important, and products are generated from the starting molecules and their fragments. From 1, PHAs such as benzo[b]thiophene (2, 29%), dibenzothiophene (3, 11%), and thianthrene (22, 4%), and from 2, PHAs such as benzo[b]naphtho[2,1-d]thiophene (32, 13%) and [1]benzothieno[2,3-b][1]benzothiophene (21, 5%) are formed in highest amounts at 850-900°C. Minor amounts of highly annulated thiophenes such as triphenyleno[1,1a,1b,2-b,c,c]thiophene (28) and benzo[1,2-b:3,4-b%:6,5-b¦]tri(benzo[b]thiophene) (36), are detected. Formation of PAHs such as benzene (4), naphthalene (5), phenanthrene (7), fluoranthene (8), and pyrene (9) increases rapidly above 850°C. Product formation
4.1 Pyrolyse fünfgliedriger stickstoffhaltiger Hetarene 11 4.1. 1 Pyrolyse von Pyrrol (7) 11 4.1.... more 4.1 Pyrolyse fünfgliedriger stickstoffhaltiger Hetarene 11 4.1. 1 Pyrolyse von Pyrrol (7) 11 4.1. 1.1 Produktverteilung 11 4.1. 1.2 Fragmentierung und Anellierung 12 4.1. 1.3 Diskussion 16 4.1. 2 Pyrolyse von Indol (8) 16 4.1. 2.1 Produktverteilung 16 4.1. 2.2 ...