Cyclopropane Research Articles

Yttrium-Catalyzed C(sp3)–H Addition to Cyclopropenes

Yttrium-Catalyzed C(sp3)–H Addition to Cyclopropenes

Cyclopropanation of β,γ-Unsaturated α-Keto Esters with Diazo Esters

Key words indium catalysis - keto esters - cyclopropanation - diazo esters

Molecular Dynamics Study of Guest–Host Hydrogen Bonding in Ethylene Oxide, Trimethylene Oxide, and Formaldehyde Structure I Clathrate Hydrates

Molecular dynamics simulations are used to study the guest–host hydrogen bonding and guest dynamics in the clathrate hydrate phases of trimethylene oxide (TMO), ethylene oxide (EO), and formaldehyde (FA) as polar guests. Two water models, the SPC/E and TIP4P/ice, were used in the simulations. Binary hydrates are constructed with these guests in the large 14-sided cages and methane placed in the small 12-sided cages of the structure sI clathrate hydrates. The results of these simulations are compared with the nonpolar guests with analogous structures, cyclobutane (CB), cyclopropane (CP), and ethane, respectively, for TMO, EO, and FA. These simulations show that oxygen atoms of the cyclic ethers and carbonyl oxygen of formaldehyde form hydrogen bonds to differing degrees with cage water hydrogen atoms. The TMO size is larger than that of the EO and FA molecules and the closer proximity of the atoms of this large guest to the cage water molecule enhances the probability of guest–host hydrogen bonding in the ...

Cyclopropane and the Explosive “Power of the Cylinder”

Cyclopropane and the Explosive “Power of the Cylinder”

Metallacycle-Mediated Coupling of Cyclopropenes with Alkynes

Metallacycle-Mediated Coupling of Cyclopropenes with Alkynes

Enantioselective Copper-Catalyzed Carbozincation of Cyclopropenes

Enantioselective Copper-Catalyzed Carbozincation of Cyclopropenes

Ring-opening metathesis polymerization of 1,2-disubstituted cyclopropenes.

The ring-opening metathesis polymerization (ROMP) of 1,2-disubstituted cyclopropenes (CPs) has been explored for the first time using Grubbs 3rd generation catalyst. A range of 1,2-CPs yielded polymers with controllable MWs and low dispersitities, and allowed the synthesis of block copolymers, absent from secondary metathesis. However, there existed a competing intramolecular termination pathway for these monomers, limiting the timescale for their ROMP to stay living.

Effects of 1-methyl cyclopropene (1–MCP) on ethylen production and physicochemical properties of tomato type Rapsona

Effects of 1-methyl cyclopropene (1–MCP) on ethylen production and physicochemical properties of tomato type Rapsona

C–H Borylation of Cyclopropanes and Cyclobutanes with Silica-SMAP–Iridium

Key words borylation - cyclopropanes - cyclobutanes - silica gel supported phosphines - iridium

Effect of pulsing, 1-methyl cyclo propene (1-MCP) and packaging treatments on postharvest physiology of cut rose cv . First Red

Effect of pulsing, 1-methyl cyclo propene (1-MCP) and packaging treatments on postharvest physiology of cut rose cv . First Red

ChemInform Abstract: Highly Regio‐ and Stereoselective Synthesis of Alkylidenecyclopropanes via Ru(II)‐Pheox Catalyzed Asymmetric Inter‐ and Intramolecular Cyclopropanation of Allenes.

AbstractThe simple cyclopropanes are formed as E/Z mixtures with the E product being the dominant one.

Rhodium-Catalyzed Cyclopropanation of N-Enoxyphthalimides

Rhodium-Catalyzed Cyclopropanation of N-Enoxyphthalimides

Rhodium(III)‐Catalyzed Transannulation of Cyclopropenes with N‐Phenoxyacetamides through CH Activation

AbstractAn efficient rhodium(III)‐catalyzed synthesis of 2H‐chromene from N‐phenoxyacetamides and cyclopropenes has been developed. The reaction represents the first example of using cyclopropenes as a three‐carbon unit in rhodium(III)‐catalyzed C(sp2)H activations.

Correction to “Rh(III)-Catalyzed Cyclopropanation Initiated by C–H Activation: Ligand Development Enables a Diastereoselective [2 + 1] Annulation of N-Enoxyphthalimides and Alkenes”

Correction to “Rh(III)-Catalyzed Cyclopropanation Initiated by C–H Activation: Ligand Development Enables a Diastereoselective [2 + 1] Annulation of N-Enoxyphthalimides and Alkenes”

Cyclopropanation of Allenes Catalyzed by Ruthenium

Cyclopropanation of Allenes Catalyzed by Ruthenium

첨가제에 의한 경질 크롬 도금 층의 열처리 후 기계적 특성 향상에 관한 연구

The addition of cyclo propane carbonyl (cpc) to chromium electroplating bath resulted in a chromium deposit which had greatly improved mechanical properties compared to conventional chromium deposits in condition of heat treatment at high temperature. The as-deposited layers had a Vicker's hardness of about 1170, which is comparable to that of conventional chromium plating deposits. With annealing, the hardness goes through a maximum of 1650 at <TEX>$600^{\circ}C$</TEX>. Generally speaking, the hardness of conventional plating decreases monotonically with heat treatment. X-ray diffraction show that annealing up to above <TEX>$400^{\circ}C$</TEX> causes formation and growth of chromium crystallites and that chromium carbides form at above <TEX>$500^{\circ}C$</TEX> temperature.

ChemInform Abstract: Modulable and Highly Diastereoselective Carbometalations of Cyclopropenes.

AbstractIt is found that cyclopropenyl derivatives of type (I) and (X) undergo Cu‐catalyzed carbomagnesiation with very high syn‐diastereoselectivity.

Modulable and Highly Diastereoselective Carbometalations of Cyclopropenes

AbstractInvited for the cover of this issue is the group of Ilan Marek at Technion–Israel Institute of Technology. The image depicts how cyclopropenes can be used to access to a variety of small, quaternary carbon‐bearing chiral building blocks. Read the full text of the article at 10.1002/chem.201303569.

Cyclopropanation of α,β-Unsaturated Aldehydes with a Supported Peptide

Cyclopropanation of α,β-Unsaturated Aldehydes with a Supported Peptide

Expanding Cyclopropenes to Bifurans

Expanding Cyclopropenes to Bifurans