Ring Size Dependent Lactam‐Lactim Tautomeric Equilibrium in Imidazolin‐2‐Chalcogenones and Pyrimidin‐2‐Chalcogenones: A Role of Aromaticity
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DOI: 10.1002/jcc.70177
Abstract: The dynamic nature of tautomerism has profound implications for structure, function, and reactivity of biologically important molecules. This study investigates the effect of ring size and aromaticity on tautomeric stability of Imidazolin‐2‐chalcogenones and Pyrimidin‐2‐chalcogenones using… read more here.
Keywords: six membered; ring size; imidazolin chalcogenones; pyrimidin chalcogenones ... See more keywords
Theoretical kinetic and thermodynamic studies of the strain energies and ring size effects of the 1,3-dipolar cycloaddition reactions on ethinamate medicine analogs
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Molecular Structure"
DOI: 10.1016/j.molstruc.2019.127544
Abstract: Abstract In this study, strain effects of a side ring on the 1,3-dipolar cycloaddition reactions were investigated. It was important to find a reactant with a ring closed at the structure of the selected dipolarophile.… read more here.
Keywords: medicine; cycloaddition reactions; kinetic thermodynamic; ethinamate medicine ... See more keywords
Stability of Carbocyclic Phosphinyl Radicals: Effect of Ring Size, Delocalization, and Sterics
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DOI: 10.1021/acs.inorgchem.2c01968
Abstract: In this computational study, we report on the stability of cyclic phosphinyl radicals with an aim for a systematical assessment of stabilization effects. The radical stabilization energies (RSEs) were calculated using isodesmic reactions for a… read more here.
Keywords: phosphinyl radicals; delocalization; kcal mol; ring size ... See more keywords
ortho-Cycloalkyl substituted N,N'-diaryliminoacenaphthene-Ni(ii) catalysts for polyethylene elastomers; exploring ring size and temperature effects.
Sign Up to like & getrecommendations! Published in 2017 at "Dalton transactions"
DOI: 10.1039/c7dt03362a
Abstract: A family of six unsymmetrical N,N'-diiminoacenaphthene-nickel(ii) bromide complexes, [1-{2,6-(Ph2CH)2-4-MeC6H2N}-2-(ArN)C2C10H6]NiBr2 (Ar = 2-(C6H11)-6-MeC6H2Ni1, 2-(C5H9)-6-MeC6H2Ni2, 2-(C8H15)-6-MeC6H2Ni3, 2-(C6H11)-4,6-Me2C6H2Ni4, 2-(C5H9)-4,6-Me2C6H2Ni5, 2-(C8H15)-4,6-Me2C6H2Ni6), each bearing one ring-size variable 4-R-2-methyl-6-cycloalkyl-substituted N-aryl group and one N'-4-methyl-2,6-dibenzhydrylphenyl group, have been prepared and fully characterized.… read more here.
Keywords: cycloalkyl substituted; ortho cycloalkyl; substituted diaryliminoacenaphthene; cycloalkyl ... See more keywords
Stereogenic cyclic oligonaphthalenes displaying ring size-dependent handedness of circularly polarized luminescence (CPL).
Sign Up to like & getrecommendations! Published in 2019 at "Chemical communications"
DOI: 10.1039/c8cc08929a
Abstract: A series of cyclic oligomers with Dn symmetry (n = 2-5) based on chiral (R)/(S)-binaphthyl exhibiting intensive chiroptical properties were synthesized by using a Ni(0)-catalyzed coupling reaction. The intensity and the handedness of circularly polarized… read more here.
Keywords: luminescence cpl; circularly polarized; handedness circularly; polarized luminescence ... See more keywords
FeCl3-Promoted ring size-dictating diversity-oriented synthesis (DOS) of N-heterocycles using in situ-generated cyclic imines and enamines.
Sign Up to like & getrecommendations! Published in 2019 at "Chemical communications"
DOI: 10.1039/c9cc03375k
Abstract: The FeCl3-promoted ring size-controlled oxidative activation of o-alkynylanilines opens up a complementary appealing protocol for poly-N-heterocycle synthesis. When electron-poor π-alkyne iron species combine with cyclic enamines obtained from cyclohexanone and β-tetralone, they undergo a regioselective… read more here.
Keywords: size dictating; ring size; promoted ring; fecl3 promoted ... See more keywords
Ring size effects in cyclic fluorophosphites: ligands that span the bonding space between phosphites and PF3.
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DOI: 10.1039/c9dt00893d
Abstract: The 5- to 8-membered cyclic fluorophosphites L5-8 have been prepared from the corresponding chlorophosphites which are derived from dihydroxyarenes or bis(trimethylsiloxy)arenes. Ligand L5 is very sensitive to hydrolysis but L6-8 are much more kinetically robust.… read more here.
Keywords: size effects; effects cyclic; fluorophosphites ligands; cyclic fluorophosphites ... See more keywords
Probing the effect of ortho-cycloalkyl ring size on activity and thermostability in cycloheptyl-fused N,N,N-iron ethylene polymerization catalysts.
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DOI: 10.1039/c9dt04325j
Abstract: The syntheses of six bis(imino)-5,6,7,8-tetrahydrocycloheptapyridine-iron(ii) chloride complexes, [2-{(Ar)NCMe}-9-{N(Ar)}C10H10N]FeCl2 (Ar = 2-(C5H9)-6-MeC6H3 Fe1, 2-(C6H11)-6-MeC6H3 Fe2, 2-(C8H15)-6-MeC6H3 Fe3, 2-(C5H9)-4,6-Me2C6H2 Fe4, 2-(C6H11)-4,6-Me2C6H2 Fe5, 2-(C8H15)-4,6-Me2C6H3 Fe6), are reported in which the ring size of the ortho-cycloalkyl group has been… read more here.
Keywords: ortho cycloalkyl; iron; ethylene polymerization; ring size ... See more keywords
Reversal of Enantioselectivity by Tuning the Ring Size of ProPhenol
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DOI: 10.1039/d4qo00668b
Abstract: Enantiodivergent synthesis to prepare both enantiomers of a chiral molecule using a single chiral source has aroused wide interest. Great achievements have been achieved by tuning non-chiral parameters such as... read more here.
Keywords: tuning ring; chemistry; size prophenol; ring size ... See more keywords
Ring-Size Dependent Ratiometric Photoluminescence of Cyclophane Mechanophores
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DOI: 10.1039/d4tc00244j
Abstract: Mechanochromic mechanophores which instantly and reversibly change their photoluminescence color are suitable molecular probes for the in-situ visualization and detection of forces that arise in polymers. Here, we report that... read more here.
Keywords: ratiometric photoluminescence; size dependent; dependent ratiometric; photoluminescence cyclophane ... See more keywords
Ringing the Changes: Effects of Heterocyclic Ring Size on Stereoselectivity in [(η5-C5Me5)RhCl], [(η5-C5Me5)IrCl] and [Ru(η6-cymene)Cl] Complexes of Chiral 3-Amino-1-Azacycles
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DOI: 10.3390/molecules29194659
Abstract: Ring size-dependent diastereoselective coordination of unsymmetrical diamines containing one azacyclic nitrogen and one exocyclic nitrogen to [(η5-C5Me5)MCl]+ cores where M = Rh, Ir and [Ru(η6-cymene)Cl]+ is reported herein. Total stereoselectivity was observed with the six-… read more here.
Keywords: c5me5; ring size; ringing changes; cymene ... See more keywords