Results 261 to 270 of about 20,087 (300)

Enantioselective Synthesis of Spirocyclic Nitrogen-Containing Heterocycles Catalyzed by an Iridium-Containing Cytochrome. [PDF]

J Am Chem Soc
Xu J, Bloomer BJ, Brunn JN, Quest AP, Chakraborty S, Schneider JE, Clark DS, Hartwig JF.   +7 more
europepmc   +1 more source

Enantioselective Organophotocatalytic α-Functionalization of Aldehydes with <i>N</i>-Lactam Radicals: A Viable Strategy for the Telescoped Synthesis of Levetiracetam. [PDF]

Org Lett
Colombo E, Boselli MF, Fattalini M, Chiroli V, Rossi S, Benaglia M, Puglisi A.   +6 more
europepmc   +1 more source

Divergent synthesis of Haplomitrium diterpenoids via a late-stage biomimetic skeletal reorganization approach. [PDF]

Nat Commun
Gao ZX, Su C, Zhang HX, Zhang YQ, Chen XX, Liu XY, Cheng AX, Xu ZJ, Lou HX.   +8 more
europepmc   +1 more source

Understanding isotopes, isomers, and isobars in mass spectrometry. [PDF]

J Mass Spectrom Adv Clin Lab
Habler K, Rexhaj A, Adling-Ehrhardt M, Vogeser M.   +3 more
europepmc   +1 more source

Biocatalytic synthesis of β-hydroxy tryptophan regioisomers.

Org Biomol Chem
Bruffy SK, Samuel H, Weilbaker HA, Buller AR.   +3 more
europepmc   +1 more source

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Stereoisomeric Phytofluenes

Journal of the American Chemical Society, 1952
Phytofluene ex tomatoes is subject to cis-trans isomerization. The native form in the tomatoes studied is a relatively thermostable but photosensitive cis compound that may rearrange spontaneously or when illuminated or under the catalytic influence of iodine in light. It then yields the more stable all-trans form possessing stronger adsorbability. The
Petracek, F. J., Zechmeister, L.
openaire   +2 more sources

Stereoisomerization during Molecular Packing

Advanced Materials, 2021
AbstractIsomerization is an essential chemical process that often evokes dramatic change of chemical, physical, or biological properties. For a long time, isomerization has been known as a transformation that is induced by certain external energy such as light, heat, or mechanical force.
Shidang Xu, Yukun Duan, Purnima Manghnani, null Kenry, Chengjian Chen, Sergey M. Kozlov, Bin Liu   +6 more
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Stereoisomerization of Cyclic Silanols

Chemistry – An Asian Journal, 2017
AbstractStereoisomerization of readily available all‐cis‐1,3,5,7‐tetrahydroxy‐1,3,5,7‐tetraisobutylcyclotetrasiloxane (1 a) was carried out under acidic conditions to afford cis‐trans‐cis (1 b), all‐trans (1 c), and cis‐cis‐trans (1 d) isomers. The compounds in the reaction mixture could be easily separated into 1 a and a mixture of 1 b, 1 c, and 1 d ...
Hisayuki Endo, Nobuhiro Takeda, Masafumi Unno   +2 more
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Stereoisomere trihalogenotricarbonylosmate(II)

Journal of Organometallic Chemistry, 1976
Abstract Mononuclear cis -dicarbonyls of divalent osmium react in suitable organic solvents with CO to produce at 20°C mer -[OsX 3 (CO) 3 ] − and at above 100°C fac -[OsX 3 (CO) 3 ] − (X = Cl, Br, I). The bands of the IR and Raman spectra are assigned on the basis of their relative intensities.
F.H. Johannsen, W. Preetz
openaire   +1 more source

Stereoisomere Aromastoffe

Zeitschrift f�r Lebensmittel-Untersuchung und -Forschung, 1991
Ursula Palm, Christiane Askari, Uwe Hener, Eckhard Jakob, Claudia Mandler, Martin Ge�ner, Armin Mosandl, Wilfried A. K�nig, Petra Evers, Ralph Krebber   +9 more
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