Conversion of Alcohols, Thiols, and Trimethysilyl Ethers to Alkyl Cyanides Using Triphenylphosphine/2,3-Dichloro-5,6-dicyanobenzoquinone/n-Bu4NCN
摘要:
Triphenylphosphine and 2,3-dichloro-5,6-dicyanobenzoquinone afford an adduct, which in the presence of n-Bu4NCN converts alcohols, thiols, and trimethylsilyl ethers into their corresponding alkyl cyanides in good to excellent yields at room temperature. This method is highly selective for the conversion of 1degrees alcohols in the presence of 2degrees and 3degrees ones, thiols and silyl ethers.
at room temperature. While, under the same reaction conditions [Sn IV (TPP)Cl 2 ] is less efficient to catalyze these reactions. One important feature of this catalyst is its ability in the chemoselective silylation of primary alcohols in the presence of secondary and tertiaryalcohols and phenols. The catalyst was reused several times without loss of its catalytic activity.
Fast and efficient method for Silylation of alcohols and phenols with HMDS in the presence of bis-thiourea complexes of cobalt, nickel, copper and zinc chlorides
作者:Behzad Zeynizadeh、Serve Sorkhabi
DOI:10.1080/10426507.2017.1417294
日期:2018.3.4
GRAPHICAL ABSTRACT ABSTRACT Bis-thiourea complexes of cobalt, nickel, copper and zinc chlorides were usedefficiently for rapid and efficient trimethylsilylation of alcohols and phenols with hexamethyldisilazane (HMDS) in CH3CN. All reactions were carried out at roomtemperature within immediate-120 min timeframe to afford trimethylsilyl ether derivatives in high to excellent yields. Investigation
[Sn IV (TNH 2 PP)(OTf) 2 ], supported on chloromethylated polystyrene in the trimethylsilylation of alcohols and phenols with hexamethyldisilazane is reported. The prepared catalyst was characterized by elemental analysis, FT-IR and diffuses reflectance UV–Vis spectroscopic methods. This catalyst was used for selective trimethylsilylation of different alcohols and phenols with HMDS, with short reaction
A mild, simple, novel, and highly efficient method for the rapid protection of various primary, secondary, tertiary aliphatic alcohols, aromatic alcohols, and oximes using hexamethyldisilazane (HMDS) in the presence of silica-supported sodium hydrogen sulfate (NaHSO 4 -SiO 2 ), as an active, inexpensive, nontoxic, heterogeneous, and readily available catalyst under ambient conditions is described.
A Highly Efficient Method for the Silylation of Alcohols, Phenols, and Naphthols Using HMDS in the Presence of Zinc Oxide (ZnO) as Economical Heterogeneous Catalyst
作者:Hamid Reza Shaterian、Majid Ghashang
DOI:10.1080/10426500701569406
日期:2007.12.24
Variety alcohols, phenols, and naphthols were effectively converted into their corresponding trimethylsilyl ether with hexamethyldisilazane in the presence of zinc oxide under very mild and ambient conditions with short reaction time in good to excellent yields.