Results 71 to 80 of about 10,116 (242)
The Solubility of Sulfur Dioxide in Protic and Basic Solvents
Nippon kagaku zassi, 1968 プロトン性溶媒および塩基性溶媒に対する二酸化イオウの溶解度を測定,比較した。プロトソ性溶媒は水素結合による溶媒間の自己会合のため二酸化イオウ溶解度が低く,水酸基の存在はしばしば溶解度に負の寄与をする。しかし分子内水素結合や2分子会合によって水素結合部分の封鎖が起こる溶媒は溶解度が高い。プロトン性溶媒自身の酸強度と二酸化イオウ溶解度との関係は見いだすことができない。塩基性溶媒は高い溶解度を示し,二酸化イオウ:溶媒分子モル比は1を越すものが多く,最高は2に達する。これを単純な溶解と見なすことはできないが,1:1付加物または2:1付加物の生成はまず確定的でない。
Hiroshi SANO, Yoshie NAKAMOTO
openaire +2 more sources
Substituent effects and solvents
, 2017 The source data matrix containing 428 data series describing substituent effects from meta and para position (25 substituents from both position) in water, protic and aprotic solvents was investigated by using conjugated deviation analysis and principal ...
O Pytela, M Ludwig
core +1 more source
Chemistry – A European Journal, EarlyView.The first microwave‐assistance‐free heterogeneous catalytic upcycling of polyoxymethylene (POM) into valuable cyclic acetals is achieved with a reusable proton‐exchanged montmorillonite (H‐Mont) catalyst. Combining interlayer accessibility with strong acidity, H‐Mont enables efficient, regenerable, and versatile transformations with potentially biomass‐
José F. Noboa +3 more
wiley +1 more source
, 1995 Second-order nonlinearities (beta) of five weak organic acids in protic solvents have been measured by the double-quantum Rayleigh scattering (DRS) technique.
Ray, Paresh Chandra, Das, Puspendu Kumar
core
Solvent Effects on the Conformational Preferences of 2,6‐Pyridylcarboxamide Foldamers
Chemistry – A European Journal, EarlyView.The marked effect of organic solvents and water/methanol mixtures on the conformational preferences of a soluble chiral foldamer has been established in a diverse array of seventeen distinct environments. ABSTRACT The marked influence of organic solvents and water on the conformational preferences of a chiral, soluble 2,6‐pyridylcarboxamide foldamer ...
Alexander R. Davis +5 more
wiley +1 more source
, 2016 The catalytic epoxidation of cyclohexene by iron(III) porphyrin complexes and H2O2 has been investigated in alcohol solvents to understand factors affecting the catalyst activity in protic solvents.
So-Young Oh (2961999) +6 more
core +1 more source
Breaking the Mold: Electrophilic Hydrophosphanation Emerges
Chemistry – A European Journal, EarlyView.Electrophilic hydride attack on the olefin, instead of the classical nucleophilic addition by a phosphanido ligand, is unveiled in rhodium‐catalyzed olefin hydrophosphanation. This hydride‐driven pathway operates for both activated and inactivated olefins, with transition states characterized by elongated Rh─H bonds and nascent C─H bond formation ...
Víctor Varela‐Izquierdo +4 more
wiley +1 more source
Silver-Mediated Allylic Disulfide Rearrangement for Conjugation of Thiols in Protic Media
, 2016 Alkyl and aryl allyl disulfides are induced to undergo the desulfurative allylic rearrangement by silver nitrate in protic solvents at room temperature, thereby removing the necessity for the use of phosphines as thiophilic reagents.
Venkataraman Subramanian (57663) +2 more
core +1 more source
Chemistry – A European Journal, EarlyView.This is a comprehensive study of new family of high functionalized meso‐tetraarylporphyrins. A synthetic approach to phosphonate‐substituted fluorinated porphyrins was developed. These compounds were investigated with respect to singlet oxygen generation and photostability.
Azhar Kechiche +8 more
wiley +1 more source
Flipping the Card With Enantiodivergent Organocatalysis
Chemistry – A European Journal, EarlyView.This minireview elaborates on recent organocatalytic strategies for achieving enantiodivergence—the ability to access both product enantiomers using a single chiral catalyst. It highlights how achiral stimuli, such as solvent polarity and chemical additives, along with minimal catalyst modifications, trigger stereochemical inversions in reactions ...
Debora Iapadre +3 more
wiley +1 more source