Zobrazeno 1 - 10
of 25
pro vyhledávání: '"Jens-Peter Steffen"'
Publikováno v:
Molecules, Vol 5, Iss 12, Pp 1372-1378 (2000)
The triplet sensitized cyclization of enyne-carbodiimide 4 leads to efficient formation of indoloquinoline 5 with concomittant loss of a methyl group. The efficient loss of the methyl group was explained using AM1 semiempirical calculations.
Externí odkaz:
https://doaj.org/article/518890ba154c42d992de62fac165659e
Publikováno v:
e-Journal of Nondestructive Testing, Vol 29, Iss 3 (2024)
The rapid evolution of Industrial Computed Tomography (CT) continues to raise the bar for high-resolution, accurate, and precise imaging tools. Developing effective micro CT test patterns is key to meeting these expectations. This study presents XR
Externí odkaz:
https://doaj.org/article/2460ea9bf54344debdb1a7071df72e3b
Publikováno v:
Synthesis. :415-418
A facile synthesis of exo-methylene 3,1-benzothiazines from ortho-alkynylated aniline 1 with alkyl or aryl isothiocyanates is described. The reaction can be set up both in a discontinuous or continuous process, the latterprotocol explored with a Cell
Autor:
Michael Maywald, Jens-Peter Steffen, Bernd Engels, Patrick W. Musch, Holger Helten, Michael Schmittel
Publikováno v:
Journal of the Chemical Society, Perkin Transactions 2. :1331-1339
The regioselectivity of the thermal cyclisations of enyne–allenes 1 can be toggled as a function of the ring size of the cycloalkene. With a cyclopentene as the ene moiety the Myers–Saito (C2–C7) cycloaromatisation product is formed, whereas wi
Publikováno v:
Angewandte Chemie International Edition. 39:2152-2155
Autor:
Michael Schmittel, Jens-Peter Steffen, Armin Burghart, R. Daniel Little, Giuseppe Silvestri, André Tallec, Tatsuya Shono, H. Toftlund
Publikováno v:
Acta Chemica Scandinavica. 53:781-791
Publikováno v:
Tetrahedron Letters. 38:6177-6180
The mode of the thermal cyclization of enyne-allenes 1 depends on ring strain effects: when the ene functionality is part of a benzene, cyclohexene or cycloheptene ring the novel C2-C6 biradical cyclization is observed, while when it is part of a cyc
Publikováno v:
ChemInform. 28
Publikováno v:
ChemInform. 28
Publikováno v:
ChemInform. 30