Modified silicone compound, process of producing the same, and cured object obtained therefrom
申请人:——
公开号:US20030065117A1
公开(公告)日:2003-04-03
It is here intended to provide a modified silicone compound having excellent heat-resistant properties and a process of producing the same, and there is disclosed a modified silicone compound having an Si—H bond and an unsaturated bond, represented by the general formula (1):
1
(wherein R
1
and R
4
are each hydrogen or a monovalent organic group; R
2
is a divalent organic group; R
4
and R
6
are each a monovalent organic group and may be the same or different; R
3
is a divalent group having an unsaturated carbon-carbon bond, represented by —C≡C— or —C(R
7
)═C(R
8
)—; and R
7
and R
8
are the same as defined in R
1
).
本文旨在提供一种具有优异耐热性能的改性有机硅化合物及其生产工艺,并公开了一种具有 Si-H 键和不饱和键的改性有机硅化合物,由通式(1)表示:
1
(其中 R
1
和 R
4
均为氢或一价有机基团;R
2
是二价有机基团
4
和 R
6
均为一价有机基团,可以相同或不同;R
3
是具有不饱和碳-碳键的二价基团,由-C≡C-或-C(R
7
)═C(R
8
)-;以及 R
7
和 R
8
与 R
1
).
A Cascade Sonogashira Cross‐Coupling‐Substitution‐Elimination Reaction for the Synthesis of Linear Conjugated Dienynes
A Sonogashira cross-coupling, nucleophilic substitution and elimination cascade reaction allows the synthesis of otherwise difficult to obtain linear dienynes, in moderate to high yields. Ionic liquids are suitable recyclable solvents for the reaction. This synthetic strategy opens new ways to prepare highly conjugated alkenes and alkynes.