A process for preparing a polyhydric alcohol according to the invention comprises subjecting a polyhydric alcohol compound having protected hydroxy group(s) to microwave irradiation in the presence of basic compound(s) or acid(s) having an acid dissociation exponent (pKa) of −8 to 3 at 25° C. to remove the protecting groups of the hydroxy group of the polyhydric alcohol compound. The invention can provide an industrially advantageous process for preparing polyhydric alcohols by readily removing protecting group(s) from protected hydroxy group(s) of polyhydric alcohol compounds.
Sequential isomerization and ring-closing metathesis: masked styryl and vinyloxyaryl groups for the synthesis of benzo-fused heterocycles
作者:Willem A.L. van Otterlo、E.Lindani Ngidi、Charles B. de Koning
DOI:10.1016/s0040-4039(03)01545-4
日期:2003.8
ring-closing metathesis (RCM) leading to the synthesis of benzo-fusedheterocycles was demonstrated by using a ruthenium-mediated isomerization followed by a ruthenium-mediated RCM reaction. This resulted in the syntheses of a variety of products including two substituted benzo[1,4]dioxins, a naphtho[2,3-b][1,4]dioxin, a 2H-chromene and a benzo[b]furan.
通过使用钌介导的异构化和钌的合成,证明了将芳基烯丙基醚和芳基烯丙基用作掩蔽的乙烯基醚和1-丙烯基苯基用于闭环复分解(RCM),导致合成苯并稠合的杂环。介导的RCM反应。这导致了多种产物的合成,包括两种取代的苯并[1,4]二恶英,萘并[2,3- b ] [1,4]二恶英,2 H-色烯和苯并[ b ]呋喃。
PROCESS FOR THE PREPARATION OF POLYHYDRIC ALCOHOLS
申请人:National Institute of Advanced Industrial Science and Technology
公开号:EP1298115A1
公开(公告)日:2003-04-02
A process for preparing a polyhydric alcohol according to the invention comprises subjecting a polyhydric alcohol compound having protected hydroxy group(s) to microwave irradiation in the presence of basic compound(s) or acid(s) having an acid dissociation exponent (pKa) of -8 to 3 at 25°C to remove the protecting groups of the hydroxy group of the polyhydric alcohol compound. The invention can provide an industrially advantageous process for preparing polyhydric alcohols by readily removing protecting group(s) from protected hydroxy group(s) of polyhydric alcohol compounds.
Arylcyclobutene polymers having improved physical properties, such as elongation, are provided. Compositions and methods for coating such arylcyclobutene polymers are also provided.
Synthesis of unsaturated 1,4-heteroatom-containing benzo-fused heterocycles using a sequential isomerization–ring-closing metathesis strategy
作者:Garreth L. Morgans、E. Lindani Ngidi、Lee G. Madeley、Setshaba D. Khanye、Joseph P. Michael、Charles B. de Koning、Willem A.L. van Otterlo
DOI:10.1016/j.tet.2009.10.061
日期:2009.12
A small library of 1,4-benzodioxins and 4H-1,4-benzoxazines was synthesized from the corresponding bis-allyloxy precursors by way of an initial isomerization to the bis-vinyloxy compounds, followed by a ring-closing metathesis using the second generation Grubbs' catalyst (G2). A related strategy, starting from benzene-1,2-dithiol and 2-mercaptophenol, afforded benzodithiin and 1,4-benzoxathiin, respectively. (C) 2009 Elsevier Ltd. All rights reserved.