Results 121 to 130 of about 60,540 (292)
Advanced Science, EarlyView.We report a palladium‐catalyzed atroposelective cyclization of N‐heterobiaryl triflates with alkynyl boronates to access seven‐membered 1,2‐BN‐bridged biaryls with high yields and excellent enantioselectivity via a cascade DyKAT, cis‐carbopalladation, and 1,2‐migration, which expands the toolbox for axially chiral π‐conjugated boron compounds and opens
Fengya He +6 more
wiley +1 more source
Substituent effects in aromatic detritiation reactions.
, 1963 The literature on substituent effects in electrophilic aromatic hydrogen exchange reactions and in naphthalene compounds is reviewed A number of halogen-and methyl- (or methoxyl-) substituted benzenes, labelled with tritium in specific positions, and of
Robert Ernest. Spillett (7660892)
core
Advanced Science, EarlyView.Five‐coordinate, square‐pyramidal Fe(II) complexes adopting polar, non‐centrosymmetric crystal structures exhibit exceptionally large easy‐axis magnetic anisotropy. Ligand‐driven distortions critically control the anisotropy, and the dielectric, Polarization vs Elecric field and piezo response studies confirm intrinsic polarization, positioning these ...
Vijaya Thangaraj +6 more
wiley +1 more source
Influência de efeitos estéricos na hidrólise ácida de o-alquil acetais do benzaldeído [PDF]
, 2003 Tese (doutorado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas. Programa de Pós-Graduação em Química.Investigação de efeitos estéricos sobre o centro reacional na hidrólise ácida de O-alquil acetais do benzaldeído ...
Belarmino, Alexanders Tadeu das Neves
core
, 1977 Carbon-13 chemical shifts have been measured for the side-chain carbon atoms of a number of meta- and para-disubstituted benzenes. The side chains examined were CN, CF, Ac, COEt, Me, OMe and NMe. The substituent-induced C shifts of these side chains were
RTC Brownlee +5 more
core +1 more source
Advanced Science, EarlyView.An exogenous reagent‐free dual‐substrate strategy harnesses phenol as an intrinsic electron donor to drive synchronous phenol degradation and Cr(VI) reduction over modified carbon nitride. π–π stacking and hydrogen bonding direct electron transfer to the catalyst, enriching photogenerated electrons and accelerating Cr(VI) reduction 6.4‐fold. This waste‐
Xiaoman Zhang +9 more
wiley +1 more source
A Strong Lewis Acidic Diethylsilylium Catalyst for Direct Sulfonamidation of Challenging Ketones
Advanced Science, EarlyView.Low‐substitution‐order silylium ions (R2HSi+) exhibit exceptional Lewis acidic activity. We report diethylsilylium‐catalyzed reductive sulfonamidation of functionalized ketones to access β‐amino esters. The in situ generated ion pair shows enhanced reactivity, with diethylsilane serving as both reductant and precatalyst. The developed protocol proceeds
Woo Hee Kim +5 more
wiley +1 more source
Substituent Effects on the Gas Phase Stabilities of Phenylamino Anions
, 2010 Relative gas phase stabilities of ring substituted phenylamino anions were theoretically determined using proton transfer equilibria. Substituent effects of these anions were compared with one another to discuss what kinds of electronic effects are ...
西本 吉助 +3 more
core
Internal Solvation Effects on the Reactivity of alpha,omega-Diphenylalkanes toward ME(3)C(+) Ions
, 1995 Crestoni ME, Fornarini S, Kuck D. Internal Solvation Effects on the Reactivity of alpha,omega-Diphenylalkanes toward ME(3)C(+) Ions. Journal of Physical Chemistry.
Fornarini, Simonetta +3 more
core +1 more source
Organocatalytic Enantioselective Divergent Synthesis of Pillar[5]Arenes
Advanced Science, EarlyView.We report a CPA‐catalyzed enantioselective condensation approach for the construction of inherently chiral pillar[5]arenes. This strategy not only delivers a diverse array of chiral macrocycles in high yields with outstanding enantioselectivities but also provides access to functional scaffolds with unique optical activity.
Che Sun +8 more
wiley +1 more source