- NON-COORDINATING ANION ACTIVATORS CONTAINING A CATION WITH LONG CHAIN ALKOXY FUNCTIONALIZATION
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Activators may comprise compounds represented by the Formula [Ar(EHR1R2)(OR3)]d+[Mk+Qn]d, wherein: Ar is an aryl group; E is nitrogen or phosphorous; R1 is a C1-C30, optionally substituted, linear alkyl group; R2 is a C1-C30, optionally substituted, linear alkyl group; R3 is a C10-C30, optionally substituted, linear alkyl group; M is an element selected from group 13 of the Periodic Table of the Elements; d is 1, 2 or 3; k is 1, 2, or 3; n is 1, 2, 3, 4, 5, or 6; n - k = d; and each Q is independently hydride, bridged or unbridged dialkylamido, halide, alkoxide, aryloxide, hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, or halosubstituted-hydrocarbyl radical. Catalysts systems may comprise these activators and methods of preparing polyolefins may use these catalysts systems.
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Paragraph 0372
(2021/05/07)
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- Total synthesis of N,O,O,O-tetraacetyl-d-ribo-phytosphingosine and its 2-epi-congener
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Total synthesis of the natural d-ribo-phytosphingosine I and its 2-epimer III in the protected form was achieved through a common strategy. The aza-Claisen rearrangement of allylic thiocyanate (Z)-V incorporated the new stereogenic centre with nitrogen and the subsequent Wittig olefination constructed a non-polar side chain. Hydrogenation, followed by removal of protecting groups, completed the syntheses of I and III.
- Martinkova, Miroslava,Pomikalova, Kvetoslava,Gonda, Jozef
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p. 84 - 91,8
(2020/08/24)
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- Synthesis of [14C] acids from their unlabeled counterparts and application toward a novel [14C] labeled hepatitis C virus polymerase inhibitor
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A strategy has been developed for the rapid construction of a [ 14C] acid from either an aromatic or an alkyl acid via a decarboxylation-carboxylation sequence. A [14C] labeled heptatitis C virus polymerase inhibitor was prepared. Other examples and the limitations of this methodology are discussed. Copyright
- Ho, Jonathan Z.,Wallace, Michael A.,Tang, Yui S.,Zhang, Andy S.,Braun, Matthew P.
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scheme or table
p. 251 - 253
(2011/05/02)
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- Hunsdiecker-type bromodecarboxylation of carboxylic acids with iodosobenzene diacetate
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Carboxylic acids are bromodecarboxylated in moderate to good yields on reaction with iodosobenzene diacetate and bromine under irradiation with a tungsten lamp. The reaction works very well with carboxylic acids having a primary, secondary or tertiary α-carbon atom, although diphenylacetic acid gives benzophenone. Benzoic acid derivatives are bromodecarboxylated in moderate yields if electron-withdrawing substituents are present in the benzene ring, while they are recovered mostly unchanged if the substituents are electron-donating. Partially iodinated products have been isolated in low yield from the bis-bromodecarboxylation of dicarboxylic acids having two bridgehead α-carbon atoms. (C) 2000 Elsevier Science Ltd.
- Camps, Pelayo,Lukach, Andrés E.,Pujol, Xavier,Vázquez, Santiago
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p. 2703 - 2707
(2007/10/03)
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- An efficient and stereoselective synthesis of (2R,2′S)-1-O-(2′-hydroxyhexadecyl)glycerol and its oxo analogs: Potential antitumour compounds from Shark Liver Oil
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Reproducible, high-yielding, cost efficient, regio- and stereoselective synthesis of the title compound 3 isolated from Shark Liver Oil has been described. The compound 3 is prepared in an overall yield of 41% from chiral synthon 4 by the sequential reaction of 4 with C-13 Wittig salt; hydrogenation; epoxidation and regioselective opening. The oxo analogs 18 and 19 are prepared from four different achiral synthons by the sequential regioselective opening of the corresponding epoxide with different alcohols, methylation and deprotection strategies. Copyright
- Baskaran, Subramanian,Baig, Mirza Hamed A.,Banerjee, Sharmila,Baskaran, Chitra,Bhanu, Kanchinadham,Deshpande, Sonali P.,Trivedi, Girish K.
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p. 6437 - 6452
(2007/10/03)
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- Thallium(I) Carboxylate Modification of the Hunsdiecker Reaction
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Treatment of a thallium(I) carboxylate with 1 molar equivalent of bromine gives the corresponding thallium(III) carboxylate dibromide.High yields of primary alkyl bromides are obtained if the thallium(III) carboxylate dibromide is treated with 0.5 mol equiv. of bromine in refluxing carbon tetrachloride.Pyrolysis of the thallium(III) derivative in the absence of added bromine gives a low yield of the corresponding alkyl bromide.The use of thallium(I) carboxylates for the preparation of alkyl bromides in high yields is limited to the salts of primary carboxylic acids.A simple procedure for the preparation of alkyl bromides from carboxylic acids using thallium(I) carbonate has been developed.
- Cambie, Richard C.,Hayward, Rodney C.,Jurlina, Jeffrey L.,Rutledge, Peter S.,Woodgate, Paul D.
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p. 2608 - 2614
(2007/10/02)
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