Catalytic Asymmetric [4+2]-Cycloaddition of Dienes with Aldehydes
作者:Luping Liu、Hyejin Kim、Youwei Xie、Christophe Farès、Philip S. J. Kaib、Richard Goddard、Benjamin List
DOI:10.1021/jacs.7b08357
日期:2017.10.4
Despite its significant potential, a general catalytic asymmetric [4+2]-cycloaddition of simple and electronically unbiased dienes with any type of aldehyde has long been unknown. Previously developed methodologies invariably require activated, electronically engineered substrates. We now provide a general solution to this problem. We show that highly acidic and confined imidodiphosphorimidates (IDPis)
Novel Acidic Ionic Liquids as Efficient and Recyclable Catalysts for the Cyclotrimerization of Aldehydes
作者:Heyuan Song、Jing Chen、Chungu Xia、Zhen Li
DOI:10.1080/00397911.2010.523804
日期:2012.1.15
Abstract A mild, efficient, and ecofriendly procedure for cyclotrimerization of aldehydes was realized by using a series of novel Brønsted acidicionicliquids (BAILs) consisting of double–SO3H groups in cations as catalysts. Good conversion of aldehydes and selectivity of trialkyl-1,3,5-trioxanes were achieved by using 1 mol% of BAILs. In addition, the catalyst system could be recycled and reused at
Synthesis of 1,3,5-trioxanes: A new, simple method using a bentonitic earth as catalyst.
作者:R. Camarena、A.C. Cano、F. Delgado、N. Zúñiga、C. Alvarez、O. García
DOI:10.1016/s0040-4039(00)91813-6
日期:1993.10
A simple method for synthesizing aliphatic as well as aromatic 1,3,5-trioxanes using as catalyst a bentonitic earth is reported. The yields ranged from good to excellent.
据报道,使用膨润土作为催化剂合成脂肪族和芳香族1,3,5-三恶烷的简单方法。产量从良到良。
Gum based chewing product and process for preparing the same
申请人:——
公开号:US20040107971A1
公开(公告)日:2004-06-10
A gum based chewing product, particularly a chewing/bubble gum, contains a synthetic or natural betel nut source, an alkaloid-like composition such as nicotine or other such alkaloids like caffeine, theine etc. from natural or synthetic origin for its source. The product preferably has taste enhancers like lime and/or catechu. A process for preparing the gum based chewing product. The product has improved high smoothness, less saliva generation, excellent overall taste and chewing properties. The gum pieces deliver 1 to 12.6 mg of nicotine per piece.
(EN) A chewable resilient tobacco flavor containing composition having a three-dimensional network. The tobacco flavor impregnated composition is intended for use as a smokeless tobacco and composed of a reaction product of a non-toxic hydrophilic polyurethane prepolymer, an aqueous reactant and tobacco flavor and/or natural tobacco.(FR) Composition résiliente à mâcher aromatisée au tabac et présentant un réseau tridimensionnel. Cette composition aromatisée au tabac est destinée à être utilisée en tant que tabac à mâcher et se compose d'un produit de réaction d'un prépolymère de polyuréthane hydrophile non toxique, d'un réactif aqueux et d'arôme de tabac et/ou de tabac naturel.