Search results for "Insertion reaction"

showing 6 items of 6 documents

Reactivity and Selectivity of Ortho-Metalated Rhodium(II) Complexes in C−H Insertion Reactions of α-Diazo Compounds

1998

Regioselective intramolecular C−H insertion reactions of α-diazo β-keto esters and α-diazo ketones are mediated by Rh2[OOCR]4-x[PC]x (x = 1, 2; PC = ortho-metalated phosphine; R = CH3, C3F7). In particular, the intramolecular transformation of 1-diazo-5-methyl-3-propyl-2-hexanone catalyzed by Rh2[OOCCH3]2[PC]2 (PC = (C6H4)P(C6H5)2, head-to-tail (H−T) configuration) afforded only the tertiary C−H insertion product. By comparison, no C−H insertion reaction was promoted by doubly metalated complexes with a head-to-head (H−H) configuration. Rh2[OOCR]3[PC] compounds were found to be less suited for these type of reactions.

ChemistryOrganic ChemistryRegioselectivitychemistry.chemical_elementMedicinal chemistryRhodiumInorganic Chemistrychemistry.chemical_compoundInsertion reactionIntramolecular forceDiazoReactivity (chemistry)Physical and Theoretical ChemistrySelectivityPhosphineOrganometallics
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III. Darstellung und molekülstruktur von triazoboracyclooctanen

1976

Abstract The aminoboration of phenylisocyanate or phenylisothiocyanate with 2-phenyl-1,3,2-diazabora-cyclohexane yields under ring expansion the eight-membered BNC-heterocycles 2,3-diphenyl-1,3,5-triaza-2-bora-cyclooctane-4-one or 2,3-diphenyl-1,3,5-triaza-2-bora-cyclooctane-4-thione, respectively. Isomeric structures, which can appear in the insertion reaction, are discussed on the basis of spectroscopic data.

Inorganic Chemistrychemistry.chemical_compoundchemistryInsertion reactionComputational chemistryOrganic ChemistryMaterials ChemistryPhysical and Theoretical ChemistryRing (chemistry)BiochemistryPhenylisocyanateJournal of Organometallic Chemistry
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Darstellung eines neuen achtgliedrigen BNC-heteroringes

1975

Abstract 2-Phenyl-1,3,2-diazaboracyclohexane reacts with phenylisocyanate by an insertion reaction leading to an eight-membered BNC-heterocycle.

Inorganic Chemistrychemistry.chemical_compoundchemistryInsertion reactionOrganic ChemistryPolymer chemistryMaterials ChemistryPhysical and Theoretical ChemistryBiochemistryPhenylisocyanateJournal of Organometallic Chemistry
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Insertion reaction of carbon dioxide into Sn-OR bond. Synthesis, structure and DFT calculations of di- and tetranuclear isopropylcarbonato tin(IV) co…

2006

The reaction of carbon dioxide with the stannane nBu2Sn(OiPr)2 and distannoxane [nBu2(iPrO)Sn]2O leads to the selective insertion into one Sn-OiPr bond generating the corresponding nBu2Sn(OiPr)(OCO2(i)Pr) and nBu2(iPrO)SnOSn(OCO2(i)Pr)nBu2 species. Both compounds are characterised by multinuclear NMR, FT-IR and single-crystal X-ray crystallography. In the solid state, they adopt a dimeric arrangement with bridging isopropoxy and terminal isopropylcarbonato ligands. The X-ray crystal structure of the dinuclear stannane shows that the Sn2O2 ring and the two Sn-OCO2C fragments are nearby coplanar. The same holds for the ladder-type tetranuclear distannoxane. The dimeric structures are also evi…

Models Molecularcrystal structureMagnetic Resonance SpectroscopySolid-statechemistry.chemical_elementCrystal structure[CHIM.INOR]Chemical Sciences/Inorganic chemistryCrystallography X-Ray010402 general chemistryPhotochemistrySensitivity and Specificity01 natural sciencesStannanedinuclear tetranuclear complexInorganic Chemistrychemistry.chemical_compoundisopropoxy stannaneInsertion reactiontinOrganotin CompoundsComputingMilieux_MISCELLANEOUSMolecular Structure010405 organic chemistryChemistrycarbon dioxideStereoisomerism[ CHIM.INOR ] Chemical Sciences/Inorganic chemistry0104 chemical sciencesCrystallographyModels ChemicalCarbon dioxideDFT optimized geometryTin
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Polymere ester von säuren des phosphors, 6. Ringöffnende polymerisation cyclischer phosphite und phosphonite durch michaelis-arbuzov-reaktion.–Theori…

1977

The hypothesis of Harwood and Patel, suggesting for the polymerization of 2-phenyl-1,3,2-dioxaphospholane a type of insertion reaction to explain the formation of ethylenediphosphinic ester structures besides the normal 2-hydroxyethyl(phenyl)phosphonic ester structures is extended to similar monomers and its theoretical consequences are examined. It is shown that in such a system mutual transformations between ω-hydroxyalkyl-P-acid and alkylenedi(P-acid)structures should occur, establishing a dynamic equilibrium and leading to a sort of azeotropic polymer, in which only one unique composition is kinetically stable. Equations relating to different kinetic parameters are deduced.

chemistry.chemical_classificationchemistry.chemical_compoundMonomerchemistryPolymerizationInsertion reactionPolymer chemistryOrganic chemistryPolymerDynamic equilibriumDie Makromolekulare Chemie
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ChemInform Abstract: Reactivity and Selectivity of ortho-Metalated Rhodium(II) Complexes in C-H Insertion Reactions of α-Diazo Compounds.

2010

Regioselective intramolecular C−H insertion reactions of α-diazo β-keto esters and α-diazo ketones are mediated by Rh2[OOCR]4-x[PC]x (x = 1, 2; PC = ortho-metalated phosphine; R = CH3, C3F7). In particular, the intramolecular transformation of 1-diazo-5-methyl-3-propyl-2-hexanone catalyzed by Rh2[OOCCH3]2[PC]2 (PC = (C6H4)P(C6H5)2, head-to-tail (H−T) configuration) afforded only the tertiary C−H insertion product. By comparison, no C−H insertion reaction was promoted by doubly metalated complexes with a head-to-head (H−H) configuration. Rh2[OOCR]3[PC] compounds were found to be less suited for these type of reactions.

chemistry.chemical_compoundchemistryStereochemistryInsertion reactionIntramolecular forcechemistry.chemical_elementRegioselectivityReactivity (chemistry)DiazoGeneral MedicineSelectivityPhosphineRhodiumChemInform
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