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Showing 1 to 12 of 12 for “"cyclopropene"”.
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Cyclopropene polymerization and enyne metathesis catalyzed by high oxidation state molybdenum alkylidenes
Chapter 1. An olefin metathesis reaction between Mo(NAr)(CHCMe2Ph)(OCMe(CF3)2)2 (Ar = 2,6diisopropylphenyl) and trans-i 1,4-divinylbenzene or trans, trans- 1,4-di-buta- 1,3-dienylbenzene (5) results in the formation of bimetallic ROMP initiators [(DME)((CF3)2MeCO)2(ArN)MoCH]2-1,4-C6H4 (DME = …
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I. The Reactions of Phenyllithium With Allyl-Chloride and Cyclopropene. Ii. Attempts to Generate a Carbonium Ion in the Presence of Phenyllithium
Made available in DSpace on 2014-12-10T23:01:48Z (GMT). No. of bitstreams: 1 7412174.pdf: 4470956 bytes, checksum: 2d76b5567476fcf4bd379d46c5a2f1ad (MD5) Previous issue date: 1973
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The Electronic Structure of The Trifluoride Ion and a New Synthesis and Reactions of 3-Chloro-1,2,3-Tris (Trifluoromethyl) Cyclopropene (Metallatetrahedrane, Molybdenum, Hypervalent)
The electronic structure of the hypervalent trifluoride ion has been calculated at the ACCD (approximate coupled clusters with doubles substitution) level. The ion was calculated to be symmetric (point group D(,(INFIN)h)) and stable with respect to F('-) and F(,2) by 11 kcal/mol.
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Cascade Transformations in Organic Synthesis: I. The Interception of Carbene Alkyne Metathesis Intermediates II. Photo-Activation of Hydrazones III. Organocatalyzed Cascade Conjugate Addition/Aldol Annulation of Organoboronates
… boron enolate intermediates, fused cyclopropene intermediates, and boronic acid intermediates. First, the multi-alkyne carbene cascade reaction under rhodium catalysis is discussed. Ten different diazoesters were synthesized and tested for cascade reactions. This transformation …
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Polyandrocarpidines: Antimicrobial and Cytotoxic Compounds From the Marine Tunicate Polyandrocarpa Sp
… with a twelve-carbon fatty acid which contains a cyclopropene ring in conjugation with a diene system, the other nitrogen is part of a primary guanidine function. It was advantageous to convert the guanidine to the dimethylpyrimidyl moiety by condensing with 2,4-pentanedione in the presence of …
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Synthesis of Cyclopropane-Fused 1,5-Diazocin-2-ones via Metal-Templated Intramolecular Addition of Nitrogen Nucleophiles to Pre-Generated Cyclopropenes
… addition of nitrogen nucleophiles to the cyclopropene double bond in a direct 8-membered cyclization. This method allows for access to previously-unknown diazocines of their type – namely, 1,5-diazocin-2-ones possessing fusion to a cyclopropane moiety. The described method allows for …
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Part 1: Lanthanum(III) Triflate-Catalyzed Cyclopropanation via Intramolecular Methylene Transfer. Part 2: Reaction Design with Aromatic Ions - Nucleophilic Acyl Substitution and Organophotoredox Catalysts
… their corresponding acid chlorides with dichlorocyclopropene reagents. The effect of cyclopropene substituents and amine base additives on the rate of conversion is examined. A mild amidation protocol employing acid chloride formation is described and applied to acid-sensitive substrates and …
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Complex botanical natural products: Synthesis of cephalotaxus esters and of the C19-diterpenoid skeleton of aconitum and delphinium alkaloids
… steps include a Diels–Alder cycloaddition of a cyclopropene with a 2,5-dioxycyclopenta-1,3-diene, a second Diels–Alder cycloaddition with a 2,5-dihydroazepine 2π component, an intramolecular N-acyliminium cyclization, and a radical conjugate addition.
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Substitution and photolytic rearrangements in three-member ring compounds
… and photolytic rearrangements of 1,2,3-triphenylcyclopropenes was conducted. Triphenylcyclopropenyl t̲-butyl ether was found to undergo alkyl group exchange with refluxing methanol, ethanol, or 2-propanol to yield the corresponding 1,2,3-triphenylcyclopropenyl alkyl ether when a trace impurity of …
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Targeted Imaging Agents for Detecting Tumour Cell Death following Therapy
… have demonstrated in vitro that a peracetylated cyclopropene mannosamine (Ac4ManNCCp)-modified sugar can be used as a tool for imaging hypersialylation in an advanced colorectal cancer model. Further optimisation of the probe to improve solubility is required to facilitate transitioning from in …
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Z-selective olefin metathesis processes and Cis/syndioselective ROMP with high oxidation state molybdenum alkylidenes
… prepared through the addition of 3,3-methylphenylcyclopropene (MPCP) to molybdenum MAP compounds. Attempts towards determination of the tacticity of cispolyMPCP are presented, including the synthesis of three 3,3-disubstituted cyclopropene monomers containing chiral tags. The cis-selective ROMP of …