Search Results - "RZEPA, Henry S"
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Chemoselective Polymerizations from Mixtures of Epoxide, Lactone, Anhydride, and Carbon Dioxide
Published in Journal of the American Chemical Society (30-03-2016)“…Controlling polymer composition starting from mixtures of monomers is an important, but rarely achieved, target. Here a single switchable catalyst for both…”
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2
A thermodynamic assessment of the reported room-temperature chemical synthesis of C2
Published in Nature communications (23-02-2021)Get full text
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3
General Synthesis of 3‐Azabicyclo[3.1.1]heptanes and Evaluation of Their Properties as Saturated Isosteres
Published in Angewandte Chemie International Edition (25-09-2023)“…A general approach to 3‐azabicyclo[3.1.1]heptanes by reduction of spirocyclic oxetanyl nitriles was developed. The mechanism, scope, and scalability of this…”
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4
Equilibrium between a cyclotrisilene and an isolable base adduct of a disilenyl silylene
Published in Nature chemistry (01-10-2013)“…In organic chemistry, compounds with adjacent alkene and carbene functionalities (vinyl carbenes) are studied widely as fleeting intermediates and in the…”
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5
Tricyclic Aromatic Isomer of Hexasilabenzene
Published in Science (American Association for the Advancement of Science) (29-01-2010)“…Benzene represents the showcase of Hückel aromaticity. The silicon analog, hexasilabenzene, has consequently been targeted for decades. We now report an…”
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N-Heterocyclic Carbene Coordinated Neutral and Cationic Heavier Cyclopropylidenes
Published in Angewandte Chemie International Edition (08-09-2014)“…Cyclopropylidene is a transient intermediate of the allene–propyne–cyclopropene isomerization. The incorporation of heavier Group 14 elements into the…”
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7
The Houk–List transition states for organocatalytic mechanisms revisited
Published in Chemical science (Cambridge) (01-01-2014)“…The ten year old Houk–List model for rationalising the origin of stereoselectivity in the organocatalysed intermolecular aldol addition is revisited, using a…”
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8
Equilibrium Formation of Stable All‐Silicon Versions of 1,3‐Cyclobutanediyl
Published in Angewandte Chemie International Edition (24-08-2020)“…Main group analogues of cyclobutane‐1,3‐diyls are fascinating due to their unique reactivity and electronic properties. So far only heteronuclear examples have…”
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The Nature of the Fourth Bond in the Ground State of C2: The Quadruple Bond Conundrum
Published in Chemistry : a European journal (19-05-2014)“…Does, or doesn’t C2 break the glass ceiling of triple bonding? This work provides an overview on the bonding conundrum in C2 and on the recent discussions…”
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10
A Stable Derivative of the Global Minimum on the Si6H6 Potential Energy Surface
Published in Angewandte Chemie International Edition (16-08-2011)“…Silicon shuffle minimizes energy: Isomerization of the dismutational isomer of hexasilabenzene (see structure; R=2,4,6‐iPr3C6H2) produces the Si‐bridged…”
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Mechanistic Diversity in Thermal Fragmentation Reactions: A Computational Exploration of CO and CO2 Extrusions from Five-Membered Rings
Published in Journal of organic chemistry (02-08-2013)“…The mechanisms of a variety of thermal pericyclic fragmentation reactions of five-membered heterocyclic rings are subjected to scrutiny at a density functional…”
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12
A Response to the Critical Comments on "One Molecule, Two Atoms, Three Views, Four Bonds?"
Published in Angewandte Chemie International Edition (03-06-2013)“…The criticism expressed by Frenking and Hermann on the notion of quadruple bonding in C2 is answered using hard facts. Both experimental and computational data…”
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13
Total Synthesis of (+)-Lophirone H and Its Pentamethyl Ether Utilizing an Oxonium–Prins Cyclization
Published in Organic letters (19-05-2017)“…The first total synthesis of (+)-lophirone H (1) and its pentamethyl ether 29, featuring an oxonium–Prins cyclization/benzylic cation trapping reaction, is…”
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14
Experimental and Computational Investigation of the Mechanism of Carbon Dioxide/Cyclohexene Oxide Copolymerization Using a Dizinc Catalyst
Published in Macromolecules (11-09-2012)“…A detailed study of the mechanism by which a dizinc catalyst copolymerizes cyclohexene oxide and carbon dioxide is presented. The catalyst, previously…”
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15
Kinetic Resolution of 2‐Substituted Indolines by N‐Sulfonylation using an Atropisomeric 4‐DMAP‐N‐oxide Organocatalyst
Published in Angewandte Chemie International Edition (15-05-2017)“…The first catalytic kinetic resolution by N‐sulfonylation is described. 2‐Substituted indolines are resolved (s=2.6–19) using an atropisomeric…”
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Cycloaddition Reactions of Azides and Electron‐Deficient Alkenes in Deep Eutectic Solvents: Pyrazolines, Aziridines and Other Surprises
Published in Advanced synthesis & catalysis (27-04-2020)“…The reaction of organic azides and electron‐deficient alkenes was investigated in a deep eutectic solvents. A series of highly substituted 2‐pyrazolines was…”
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Lemniscular Hexaphyrins as Examples of Aromatic and Antiaromatic Double-Twist Möbius Molecules
Published in Organic letters (06-03-2008)“…Two reported [26] and [28]hexaphyrins are analyzed via measured and computed geometries and NMR-shieldings as examples of respectively 4n + 2 π-electron…”
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Intrinsically chiral aromaticity. Rules incorporating linking number, twist, and writhe for higher-twist Möbius annulenes
Published in Journal of the American Chemical Society (18-06-2008)“…The geometries of coiled annulenes belonging to the chiral C2 and D(n) (n = 2,7) point groups are defined by two chiral indices, W(r) and T(w), respectively…”
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An Accessible Method for DFT Calculation of 11B NMR Shifts of Organoboron Compounds
Published in Journal of organic chemistry (03-08-2018)“…The study of boron-mediated reactions in organic synthesis and reactions of organoboron compounds is greatly facilitated by the use of 11B NMR. However, the…”
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Contraction and Expansion of the Silicon Scaffold of Stable Si6R6 Isomers
Published in Journal of the American Chemical Society (26-09-2012)“…The reactivity of two stable Si6R6 clusters (4 and 5, R = 2,4,6- i Pr3C6H2) with unsymmetrical substitution patterns (including Si, SiR, and SiR2 vertices) is…”
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