New mono- and di-nuclear complexes of PdII, PtII and NiII of PNNP ligands with a 2,2′-biaryl bridging unit

Synthesis of a 2D Lander

“…[15] This is why we have devised an alternative route for its preparation from biphenyl-2,2Ј-dicarbaldehyde which can be obtained in nearly quantitative yield by Swern oxidation of commercial (2Ј-hydroxymethyl-biphenyl-2-yl)-methanol. [16] Attempts to directly prepare alkyne 3 by a one-pot Wittig-type condensation with dibromomethyltriphenylphosphonium bromide in the presence of potassium tert-butoxide [17] was unsuccessful and gave only low yields of the target product; therefore, the Corey-Fuchs conver-sion was preferred. This reaction gave 2,2Ј-bis(2,2-dibromoethenyl)biphenyl 2 in nearly quantitative yield.…”

Synthesis of Pyridylphosphonates by Rhodium‐Catalyzed [2+2+2] Cycloaddition of 1,6‐ and 1,7‐Diynes with Diethyl Phosphorocyanidate

“…Starting diynes 1a ,19 1b ,19 1c ,20 1d ,18 1e ,19 1f ,21 1g ,19 1h ,19 1i ,19 1j ,22 1k ,21 1l ,22 1m ,23 1n ,24,25 1o ,26 1p ,27 and 1q 22 were prepared according to the literature.…”

Synthesis and Liquid Crystal Property of 4,5-Disubstituted Phenanthrene and 9,10-Dihydrophenanthrene Derivatives

“…研究了氢化铝锂的投料配比以 及反应温度对产物 10 收率的影响. 将氢化铝锂换成硼 氢化钠后, 在四氢呋喃-甲醇溶液中回流反应可高收率 的得到二苄醇 3a, 二苄醇化合物 10 和 3a 用温和的 Swern 氧化剂 [17] 即可氧化为联苯二醛 11a 和 2a, 11a 和 2a 在乙酸回流条件下滴加过量的水合肼, 即可关环得 到单溴代的菲 12a 或双溴代的 1a [18,19] 4,5-双(三氟甲基)菲(1b, 12b)的合成可由相应的 18b, 17b 用 DDQ (2,3-二氯-5,6-二氰基对苯醌)氧化脱 氢来制备 [20] . 通过上述合成路线 1 和路线 2 分别制备出 了关键的中间体 17, 18, 12a, 1a 以及 1b 和 12b, 再与不 同的基团反应合成出不同系列的液晶单体分子, 见图 4.…”