{[[K.18-Crown-6]Br3}n: A tribromide catalyst for the catalytic protection of amines and alcohols
作者:Gholamabbas Chehardoli、Mohammad Ali Zolfigol、Fateme Derakhshanpanah
DOI:10.1016/s1872-2067(12)60644-5
日期:2013.9
[K.18-Crown-6]Br3}n, a unique tribromide-type catalyst, was utilized for the N-boc protection of amines and trimethylsilylation (TMS) and tetrahydropyranylation (THP) of alcohols. The method is general for the preparation of N-boc derivatives of aliphatic (acyclic and cyclic) and aromatic, and primary and secondary amines and also various TMS-ethers and THP-ethers. The simple separation of the catalyst
dodecanal dimethyl acetal and dodecyl silyl ethers in MeCN–H2O was examined using a catalyticamount of π-acceptors such as 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ), tetracyanoethylene (TCNE), 7,7,8,8-tetracyanoquinodimethane (TCNQ), 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (TCNQF4), and chloranil (CA). Cleavage of dodecyl triethylsilyl ether with TCNQ and CA was caused by room light
<i>N</i>-Bromosuccinimide (NBS): A Mild and Efficient Catalyst for Tetrahydropyranylation of Alcohols and Phenols under Solvent-Free Conditions
作者:Ardeshir Khazaei、Amin Rostami、Ayeh Raiatzadeh
DOI:10.1002/jccs.200700148
日期:2007.8
Different types of alcohols and phenols are tetrahydropyranylated in the presence of NBS catalyst in good to excellent yields undermild, neutral and solvent-freeconditions.
A highly efficient and ecofriendly procedure for tetrahydropyranylation of alcohols and phenols in the presence of in-situ generated I2 under heterogeneous and neutral conditions
作者:Amin Rostami、Sadegh Rahmati、Ardeshir Khazaei
DOI:10.1007/s00706-009-0117-7
日期:2009.6
AbstractMolecular iodine generated in situ from Fe(NO3)3·9H2O/NaI acts as a highlyefficient catalyst for tetrahydropyranylation of various alcohols and phenols with 3,4-dihydro-2H-pyran in almost quantitative yields. The reaction occurs rapidly in dichloromethane at room temperature, and use of toxic molecular iodine is avoided. Graphical Abstract
摘要由Fe(NO 3)3 ·9H 2 O / NaI原位生成的分子碘,是一种高效的催化剂,用于以几乎定量的产率将各种醇和酚与3,4-二氢-2 H-吡喃进行四氢吡喃基化。该反应在室温下于二氯甲烷中迅速发生,避免了有毒分子碘的使用。 图形概要
Chehardoli, Gholamabbas; Zolfigol, Mohammad Ali; Khakyzadeh, Vahid, South African Journal of Chemistry, 2011, vol. 64, p. 127 - 131
作者:Chehardoli, Gholamabbas、Zolfigol, Mohammad Ali、Khakyzadeh, Vahid、Gholami, Hadi、Niknam, Khodabakhsh