palladium-catalyzed alkoxycarbonylation of an α-chloro ketone can be efficiently combined to a Michaeladditionreaction in a new two-step dominoreaction, allowing the synthesis of original highly functionalized α-alkylated β-ketoesters. The scope of the reaction was extended to several α-chloro ketones and Michael acceptors with moderate to very good yields.
1, 5-Bis(trimethylsiloxy)-1, 5-dimethoxy-1, 4-pentadienes (7) can be prepared in good yield by silylation of the dianions of dimethyl glutarates (8). On treatment with titanium tetrachloride, 7 cyclise stereoselectively to dimethyl trans-cyclopropane-1, 2-dicarboxylates 10. Reaction of 7 with acetic anhydrode and titanium tetrachloride gives substituted cyclobutanes 22b–d.
PIPERIDINE DERIVATIVE, LIQUID CRYSTAL COMPOSITION AND LIQUID CRYSTAL DISPLAY DEVICE
申请人:JNC CORPORATION
公开号:US20160090534A1
公开(公告)日:2016-03-31
To provide a compound having an effect for preventing photolysis of a liquid crystal composition, and having a high solubility in the liquid crystal composition, a liquid crystal composition containing the compound, and a liquid crystal display device including the composition. The compound is represented by formula (1), a liquid crystal composition contains the compound, and a liquid crystal display device includes the composition:
M(Z-Q)
a
(R
b
)
b
(1)
wherein, in formula (1), a is 1 to 4, and b is a numerical value: (4−a); M is an organic group; Z is a single bond or the like; and Q is a monovalent group represented by formula (Q-1), (Q-2) or (Q-3), in which R
a
and R
b
are hydrogen, alkyl or the like.
Diversity in Modes of Reactions of (η<sup>3</sup>-1-Trimethylsiloxyallylic)Fe(CO)<sub>2</sub>NO Complexes. Nucleophilic Addition and Cyclization on the Allylic Ligands
作者:Keiji Ito、Saburo Nakanishi、Yoshio Otsuji
DOI:10.1246/cl.1988.473
日期:1988.3.5
The titled ironcomplexes derived from 3-iodo-1-trimethylsiloxypropenes and [Bu4N][Fe(CO)3NO] reacted with carbon nucleophiles such as NaCH(CO2Et)2 to give the corresponding nucleophileaddition products in high yields. The addition occurred at the 3-position of the ligands with high regioselectivity. However, the ironcomplexes derived from 2-alkyl-3-iodo-1-trimethylsiloxypropenes underwent cyclization
Foam compositions are provided. The compositions are prepared from multi-functional acetoacetate esters and multi-functional amines or acrylates. The foam compositions can include one or more additives. The foam compositions can be used for home and commercial insulation, air sealing, sound proofing, structural improvement, and exterior roofing, among other applications. The foam compositions provide advantages of being isocyanate free and offer reduced exposure to isocyanate.