26198-07-2

Upstream product

• 142651-25-0 4-(1',3'-dioxolan-2'-yl)benzyl alcohol 
• 73291-09-5 4-chloromethylbenzaldehyde 
• 107-21-1 ethylene glycol 
• 52010-97-6 4-(hydroxylmethyl)benzaldehyde 

Downstream Products

• 104028-60-6 E-4-[2-(3-pyridyl)ethenyl]benzaldehyde ethylene acetal 
• 1221432-85-4 2-(4-methylene-1-(prop-2-ynyl)cyclohexa-2,5-dienyl)-1,3-dioxolane 
• 26104-71-2 Triphenyl-<4-(1,3-dioxolanyl-(2)-benzyl>-phosphoniumchlorid 

Relevant academic research and scientific papers

COMPOUND HAVING ALKENYL GROUP AT BOTH TERMINALS, LIQUID CRYSTAL COMPOSITION AND LIQUID CRYSTAL DISPLAY ELEMENT

PROBLEM TO BE SOLVED: To provide a liquid crystalline compound satisfying at least one of demands for physical properties such as high stability to heat or light, a high clearing point (or a high maximum temperature), low minimum temperature of a liquid crystal phase, small viscosity, suitable optical anisotropy, large dielectric anisotropy, suitable elastic modulus and good compatibility with other liquid crystalline compounds, a liquid crystal composition comprising the above compound, and a liquid crystal display element containing the composition. SOLUTION: A compound represented by formula (1) is provided. In the formula, R1 and R2 each independently represent an alkenyl group having 2 to 10 carbon atoms, or the like; ring A1, ring A2 and ring A3 each independently represent 1,4-phenylene or 1-4-phenylene in which at least one hydrogen is replaced by fluorine or chlorine; Z1 and Z2 each independently represent an alkylene having 1 to 4 carbon atoms, or the like and at least one of Z1 and Z2 may be a single bond; and a represents 1 or 2. SELECTED DRAWING: None COPYRIGHT: (C)2017,JPO&INPIT

Propargylic and allenic carbocycle synthesis through palladium-catalyzed dearomatization reaction

The dearomatization reaction of benzylic chlorides (1a?k), chloromethylnaphthalenes (1l?r), and naphthalene allyl chlorides (3a?d) with allenyltributyltin proceeded smoothly in the presence of Pd(PPh 3)4 catalyst at room temperature to give the corresponding propargylated and/or allenylated dearomatization products (5, 5′; 6, 6′; and 7, respectively) in high to fair yields. The reaction of 1a?k proceeded smoothly in the presence of TBAF, whereas it was not necessary to use TBAF as an additive in the reactions of 1l?k and 3a?d. These reactions provided a new and efficient method for the synthesis of propargylic and allenic carbocycles.