- Efficient access to triarylmethanes through decarboxylation
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A new synthetic approach has been developed for efficient access to triarylmethanes by palladium catalyzed decarboxylative cross coupling reactions. The reaction features sp2-sp3 coupling where benzoic acids upon decarboxylation reac
- Saha, Tiash,Kumar, M. Srinivas Lavanya,Bera, Saurav,Karkara, Bidhu Bhusan,Panda, Gautam
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p. 6966 - 6971
(2017/02/05)
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- An efficient and selective method for the iodination and bromination of alcohols under mild conditions
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A straightforward and effective procedure for the conversion of a variety of alcohols into the corresponding alkyl iodides and bromides is described using KX/P2O5 (X = I, Br). The reactions were easily carried out in acetonitrile under mild conditions. Using this method, the selective conversion of benzylic alcohols in the presence of aliphatic alcohols was achieved.
- Khazdooz, Leila,Zarei, Amin,Aghaei, Hamidreza,Azizi, Ghobad,Gheisari, Mohammad Mehdi
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p. 168 - 171
(2015/12/30)
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- Application of "click" chemistry in solid phase synthesis of alkyl halides
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A convenient and highly selective microwave assisted procedure for the conversion of allylic, benzylic and aliphatic alcohols to their corresponding halides using polymer-bound triphenylphosphine and iodine is presented. In case of symmetrical diols, mono-iodination product is obtained in very high yield. Additionally, highly regioselective behavior is observed in our procedure. Simplicity in operation, no column chromatography required for the purification of the products, recyclability of the reagents used, short reaction times and good to excellent yields are the advantages of our protocol. Most functional groups remain unaffected under our reaction condition.
- Das, Diparjun,Chanda, Tridib,Rokhum, Lalthazuala
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p. 775 - 783
(2016/01/20)
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- Efficient and selective iodination of benzylic alcohols using NaI/bronsted ionic liquid system at room temperature
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A simple, chemoselective, and effective procedure for the conversion of benzylic and allylic alcohols into corresponding iodides using NaI in the presence of a catalytic amount of 3-methylimidazolium hydrogensulfate ([Hmim]+[image omitted]) at room temperature is reported.
- Hajipour, Abdol R.,Rafiee, Fatemeh,Ruoho, Arnold
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experimental part
p. 603 - 611
(2011/04/15)
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- Iodination of alcohols over Keggin-type heteropoly compounds: A simple, selective and expedient method for the synthesis of alkyl iodides
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Different catalysts derived from Keggin-type heteropoly compounds were prepared and their catalytic activities have been compared in the iodination of benzyl alcohol with KI under mild reaction conditions. A high catalytic activity was found over tungstophosphoric acid supported on silica and titania. The effect of catalyst loading, iodine source and the nature of substituents on the aromatic ring of benzyl alcohol were investigated. Finally, several competitive reactions were studied between structurally diverse alcohols. This protocol provides a mild and expedient way for the conversion of various alcohols to their corresponding alkyl iodides with high selectivity.
- Rafiee, Ezzat,Mahdavia, Houri,Joshaghani, Mohammad
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experimental part
p. 135 - 140
(2011/06/09)
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- Iodination of alcohols under microwave irradiation using KI in the presence of a catalytic amount of ionic liquid triethylamoniom hydrogensulfate([Et 3NH]+HSO4-)
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The iodination of alcohols with KI in the presence of a catalytic amount of triethylamoniom hydrogensulfate ([Et3NH]+HSO 4-) as a novel and inexpensive ionic liquid under microwave irradiation has been investigated. Copyright Taylor & Francis Group, LLC.
- Hajipour, Abdol R.,Azizi, Ghobad,Ruoho, Arnold E.
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experimental part
p. 242 - 250
(2009/04/07)
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- Synthesis of alkyl iodides/nitriles from carbonyl compounds using novel ruthenium tris(2,2,6,6-tetramethyl-3,5-heptanedionate) as catalyst
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Aldehydes and ketones were hydrogenated to the corresponding alcohols, which were then transformed in situ into their respective iodides and nitriles in good yields. A structurally well-defined O-containing transition metal complex, Ru (TMHD)3, was found to be the active catalyst for hydrogenation, iodination and cyanation reactions. It has high affinity for the transformation of benzylic alcohols to iodides and nitriles.
- Bhor, Malhari D.,Panda, Anil G.,Nandurkar, Nitin S.,Bhanage, Bhalchandra M.
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body text
p. 6475 - 6479
(2009/04/06)
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- An expedient stereoselective synthesis of (Z)- and (E)-allyl iodides from Baylis-Hillman adducts along with selective iodination of benzylic alcohols using the polymethylhydrosiloxane-iodine system
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A stereoselective method has been developed for the synthesis of (Z)- and (E)-allyl iodides from Baylis-Hillman adducts using polymethylhydrosiloxane (PMHS) and iodine in chloroform at room temperature. In addition, the reagent system has been utilized for the iodination of benzylic alcohols selectively.
- Das, Biswanath,Holla, Harish,Srinivas, Yallamalla,Chowdhury, Nikhil,Bandgar
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p. 3201 - 3204
(2007/10/03)
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- 4-Aminophenyldiphenylphosphinite (APDPP), a new heterogeneous and acid scavenger phosphinite - Conversion of alcohols, trimethylsilyl, and tetrahydropyranyl ethers to alkyl halides with halogens or N-halosuccinimides
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A new heterogeneous phosphinite, 4-aminophenyldiphenylphosphinite (APDPP), is prepared and used for the efficient conversion of alcohols, trimethylsilyl ethers, and tetrahydropyranyl ethers to their corresponding bromides, iodides, and chlorides in the presence of molecular halogens or N-halosuccinimides. The amino group in this phosphinite acts as an acid scavenger and removes the produced acid. A simple filtration easily removes the phosphinate by-product.
- Iranpoor, Nasser,Firouzabadi, Habib,Gholinejad, Mohammad
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p. 1006 - 1012
(2007/10/03)
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- Facile conversion of alcohols into their bromides and iodides by N-bromo and N-iodosaccharins/triphenylphosphine under neutral conditions
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N-Bromo and N-iodosaccharins in the presence of triphenylphosphine convert alcohols into the corresponding bromides and iodides in good to excellent yields at room temperature under neutral conditions.
- Firouzabadi, Habib,Iranpoor, Nasser,Ebrahimzadeh, Farzaneh
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p. 1771 - 1775
(2007/10/03)
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- Silicaphosphine (Silphos): A filterable reagent for the conversion of alcohols and thiols to alkyl bromides and iodides
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Silicaphosphine (Silphos), [P(Cl)3-n(SiO2) n], as a new heterogeneous reagent is introduced. This reagent converts alcohols and thiols to their corresponding bromides and iodides in the presence of X2 (X=Br, I) in refluxing CH3CN in high to quantitative yields. Use of Silphos provides a highly practical method for the easy separation of the Silphos oxide byproduct by a simple filtration.
- Iranpoor, Nasser,Firouzabadi, Habib,Jamalian, Arezu,Kazemi, Foad
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p. 5699 - 5704
(2007/10/03)
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- Direct halogenation of alcohols and their derivatives with tert-Butyl halides in the ionic liquid [pmIm]Br under sonication conditions - A novel, efficient and green methodology
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A novel halogenating reagent system for direct halogenation of alcohols has been developed. tert-Butyl bromide, chloride and iodide in combination with the ionic liquid [pmIm]Br have been found to convert alcohols into the corresponding bromides, chlorides and iodides under sonication conditions (or heating) in good yields. Although a variety of primary and secondary alcohols participated in this reaction without any difficulty, tertiary alcohols remained inert. Several alcohol derivatives such as OTMS, OTBDMS, OAc, OTS and OTHP are also transformed into the corresponding halides in one-pot fashion by this procedure. A plausible rationale for this transformation is also presented. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005.
- Ranu, Brindaban C.,Jana, Ranjan
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p. 755 - 758
(2007/10/03)
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- A simple, efficient, and highly selective method for the iodination of alcohols using ZrCl4/NaI
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Iodination of primary, secondary, allylic, and benzylic alcohols giving their corresponding iodides was achieved with ZrCl4/NaI in anhydrous CH3CN with excellent yields and selectivities.
- Firouzabadi, Habib,Iranpoor, Nasser,Jafarpour, Maasoumeh
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p. 7451 - 7454
(2007/10/03)
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- Facile preparation of benzylic iodides under solvent-free conditions using microwave irradiation
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Benzylic alcohols are rapidly converted to the corresponding benzylic iodides using combination of p-toluenesulfonic acid (PTSA) and potassium iodide under solvent-free microwave irradiation conditions.
- Lee, Jong Chan,Park, Jin Young,Yoo, Eun Sang
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p. 2095 - 2099
(2007/10/03)
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- Silica Chloride (SiO2-Cl), a New Heterogeneous Reagent, for the Selective and Efficient Conversion of Benzylic Alcohols to Their Corresponding Chlorides and Iodides
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Structurally different benzylic alcohols were efficiently converted to their corresponding chlorides by silica chloride (SiO2-Cl) in CHCl3 at room temperature. Silica chloride is also able to convert benzylic alcohols to their iodides in the presence of NaI in a mixture of CH3CN/CHCl3 in excellent yields.
- Firouzabadi, Habib,Iranpoor, Naser,Karimi, Babak,Hazarkhani, Hassan
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p. 3671 - 3677
(2007/10/03)
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- An alternative method for the highly selective iodination of alcohols using a CsI/BF3·Et2O system
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A variety of allylic and benzylic alcohols have been converted into the corresponding iodides using cesium iodide (CsI) in the presence of boron trifluoride etherate (BF3·Et2O) in acetonitrile under mild conditions.
- Hayat, Safdar,Atta-Ur-Rahman,Khan, Khalid Mohammed,Choudhary, M. Iqbal,Maharvi, Ghulam Murtaza,Zia-Ullah,Bayer, Ernst
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p. 2531 - 2540
(2007/10/03)
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- An expedient and highly selective iodination of alcohols using a KI/BF3·Et2O system
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Alkyl iodides are prepared in high yields by treatment of allylic and benzylic alcohols with an equimolar amount of KI in the presence of BF3·Et2O in dioxane under mild conditions.
- Bandgar,Sadavarte,Uppalla
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p. 951 - 953
(2007/10/03)
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- New one-pot synthesis of alkyl nitrates from alcohols
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Treatment of alcohols with Ph3P-I2-imidazole followed by 'in situ' reaction of the generated iodides with AgNO3 allows the mild conversion of alcohols into alkyl nitrates. Unlike previous procedures, this one requires no electrophilic nitrating conditions.
- Castedo,Marcos,Monteagudo,Tojo
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p. 677 - 681
(2007/10/02)
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- Kinetics of the reactions of laser-flash photolytically generated carbenium ions with alkyl and silyl enol ethers. Comparison with the reactivity toward alkenes, allylsilanes and alcohols
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Diarylcarbenium ions (benzhydryl cations) are generated from diarylmethyl chlorides by 20-ns laser pulses (248 nm) in acetonitrile solution at 20°C. The second-order rate constants for their reactions with n- and π-nucleophiles (anions, alcohols, water, alkenes, allylsilanes, alkyl and silyl enol ethers) are determined by monitoring the decay of the UV-vis transients at variable nueleophile concentrations. Only reactive nucleophiles (k2 > 106-107 L mol-1 s-1) can be investigated by this method because of the concomitant reactions of the carbenium ions with the solvent acetonitrile and the chloride ions in produced in the photoheterolysis. The largest observed values of k2 are ~2 × 1010 for reactions with anions and (2-4) × 109 L mol-1 s-1 for reactions with neutral nucleophiles. Alkoxy-substituted ethylenes are 300-105 times more reactive than the corresponding alkyl-substituted ethylenes. The reactivities of structurally analogous alkyl and silyl enol ethers differ by less than 1 order of magnitude. In sharp contrast to the situation previously observed for the reactions of benzhydryl cations with alkenes, the nucleophilic reactivities of the enol ethers correlate with their ionization potentials and not with the stabilities of the carbenium ions produced in the rate-determining step. The rate constants measured for the reactions of the flash photolytically generated benzhydryl cations with alkenes and allylsilanes agree well with those extrapolated from the reactivities of these nucleophiles toward less electrophilic benzhydryl cations, which have previously been determined by conventional techniques. Combination of the two sets of data yields a nucleophilicity scale with respect to the reference electrophile (p-H3CC6H4)2CH+.
- Bartl, J?rg,Steenken, Steen,Mayr, Herbert
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p. 7710 - 7716
(2007/10/02)
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- Carbon-Halogen Bonding Studies. Halogen Redistribution Reactions between Alkyl or Acetyl Halides and Tri-n-butyltin Halides
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The equilibrium positions have been determined for the halogen redistribution reactions of tri-n-butyltin halides with a variety of structurally different types of alkyl halides and with acetyl halides.These have been related through the reaction ΔGo values to carbon-halogen bond dissociation energy differences.It is suggested that the trends observed in the latter may provide evidence for the existence of a small steric bond weakening effect in the order C-I > C-Br > C-Cl bonds on going from methyl to primary, secondary, and tertiary alkyl halides.On the other hand, with the 2,3-? bond containing allyl, benzyl, and propargyl halides , α-haloacetones, and haloacetonitriles, there may be some type of electronic carbon-halogen bond strengthening effect which lies in order C-I > C-Br > C-Cl.Finally, for the acetyl halides, the data are in agreement with increases in bond strengths resulting from ? contributions being in the order C-Cl > C-Br > C-I.
- Friedrich, Edwin C.,Abma, Charles B.
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p. 1367 - 1371
(2007/10/02)
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