Results 231 to 240 of about 281,059 (296)

Structural Determinants of μ-Opioid Receptor Antagonism and Respiratory Liability in Phenylfentanyl Analogues. [PDF]

ACS Chem Neurosci
Li E, Kale BS, Silte AA, Lyu R, Upadhyay N, Neel LT, Reda A, Wang H, Dewey WL, Pagare PP, Zhang Y.   +10 more
europepmc   +1 more source

Late-stage generation of ¹⁴C/³H-radiolabeled lysine residues via hydroformylation of peptides. [PDF]

Nat Commun
Schick A, San Jose Gracia M, Christian D Hammershøj H, Broddefalk J, Martínez-Pardo P, Enemærke VJ, von Sydow L, Holub A, Gopalakrishnan R, Mühlfenzl KS, Skrydstrup T, Elmore CS.   +11 more
europepmc   +1 more source

Sesamol derivatives bearing a quinazolin moiety: synthesis, antifungal efficacy against tea plant pathogens, and mechanistic insights. [PDF]

Nat Prod Bioprospect
Tang H, Liu S, Wang F, Gao C, Jin L, Xie D.   +5 more
europepmc   +1 more source

Isochromane-3,4-diones in Direct Vinylogous Aldol Reaction: Scope and Limitations. [PDF]

Molecules
Arshad SG, Mousavi MS, Tedesco C, Massa A.   +3 more
europepmc   +1 more source

TCA cycle rewiring underpins histone acetylation sourcing and cell-fate transitions during exit from naive pluripotency.

Cell Stem Cell
Kafkia E, Pladevall-Morera D, Argemi-Muntadas L, Wang G, Noberini R, Casòliba-Melich A, Bagés-Arnal S, Anagho-Mattanovich M, Silvério-Alves R, Gassler J, Bonaldi T, Rabelink TJ, Moritz T, Żylicz JJ.   +13 more
europepmc   +1 more source

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Application of 13C-labeling and 13C–13C COSY NMR experiments in the structure determination of a microbial natural product

Archives of Pharmacal Research, 2013
The elucidation of the structures of complex natural products bearing many quaternary carbons remains challenging, even in this advanced spectroscopic era. (13)C-(13)C COSY NMR spectroscopy shows direct couplings between (13)C and (13)C, which comprise the backbone of a natural product.
Jongheon Shin, Dong-Chan Oh, Park Sunghyouk   +2 more
exaly   +3 more sources

[1,2,3,4-13C] Testosterone and [1,2,3,4-13C] estradiol

Steroids, 1984
The preparation of [1,2,3,4-13C] testosterone and of [1,2,3,4-13C] estradiol by total synthesis is described. The 13C labels are introduced by alkylating intermediate 1 with [1,2,3,4-13C]l-iodo-3,3-ethylenedioxybutane (2) to obtain intermediate 10. Hydrolysis of the ketal function, cyclization, aromatization and removal of protective groups gave [1,2,3,
G, Zomer, H, Wynberg, N M, Drayer
openaire   +4 more sources

Accurate determinations of one-bond 13C–13C couplings in 13C-labeled carbohydrates

Journal of Magnetic Resonance, 2013
Carbon plays a central role in the molecular architecture of carbohydrates, yet the availability of accurate methods for (1)D(CC) determination has not been sufficiently explored, despite the importance that such data could play in structural studies of oligo- and polysaccharides.
Hugo F, Azurmendi, Darón I, Freedberg
openaire   +2 more sources

Editing of 13C13C satellite spectra

Journal of Magnetic Resonance (1969), 1988
Abstract The SEMUT and DEPT spectral editing techniques are combined with the techniques INADEQUATE and SLAP for observation of 13C13C satellites in natural abundance samples. The theory is documented by experimental edited spectra, in some cases exhibiting dramatic simplification compared to the normal spectra.
Niels Chr Nielsen, Henrik Bildsøe, Hans J jakobsen, Ole W S/orensen   +3 more
openaire   +1 more source

13C-13C Coupling in [1.1.1]Propellane

Tetrahedron Letters, 1990
Abstract The C1–C2 coupling constant in [1.1.1]propellane is measured to be 9.9 ± .1 Hz. The CH bond is sp 2.1 and the CCH 2 bond is estimated to be sp 8.6 -sp 4.8 . The remaining orbital at each bridgehead carbon is sp 0.5 .
Ronald M. Jarret, Leonarda Cusumano
openaire   +1 more source