Cobalt-Catalyzed Allylic C(sp<sup>3</sup>)–H Carboxylation with CO<sub>2</sub>
作者:Kenichi Michigami、Tsuyoshi Mita、Yoshihiro Sato
DOI:10.1021/jacs.7b02775
日期:2017.5.3
tolerability, so that selective addition to CO2 occurred in the presence of other carbonyl groups such as amide, ester, and ketone. Since styrylacetic acidderivatives can be readily converted into optically active γ-butyrolactones through Sharpless asymmetric dihydroxylation, this allylic C(sp3)-H carboxylation showcases a facile synthesis of γ-butyrolactones from simple allylarenes via short steps.
借助 Co/Xantphos 复合物开发了末端烯烃的烯丙基 C(sp3)-H 键与 CO2 的催化羧化。广泛的烯丙基芳烃和 1,4-二烯以中等至高产率成功转化为线性苯乙烯乙酸和六-3,5-二烯酸衍生物,并具有出色的区域选择性。羧化显示出显着的官能团耐受性,因此在其他羰基(如酰胺、酯和酮)存在的情况下,会发生选择性加成到 CO2 中。由于苯乙烯乙酸衍生物可以通过 Sharpless 不对称二羟基化很容易地转化为光学活性的 γ-丁内酯,这种烯丙基 C(sp3)-H 羧化展示了从简单的烯丙基芳烃通过短步骤轻松合成 γ-丁内酯。
Reversal of the benzophenone reactivity upon η5-complexation to bis (η-cyclopentadienyl) zirconium
作者:Frank Rosenfeldt、Gerhard Erker
DOI:10.1016/s0040-4039(00)77773-2
日期:1980.1
Reversal of the carbonyl activity of benzophenone, serving as electron donor in single-electron transfer processes and acting as a proton acceptor through the ‘carbonyl’ carbon atom, is observed upon η2-complexation to zirconocene.
Radikalische reaktionswege bei thermisch induzierten umsetzungen von zirconocenkomplexen
作者:G. Erker、F. Rosenfeldt
DOI:10.1016/0040-4020(82)85115-6
日期:1982.1
The formation of products 2, 3 and 4 (a–l) from both the reaction of η2-benzophenone zirconocene 1 with alkyl halides and the thermolysis of the α-(Cp2ZrCl)-substituted benzhydrylmethylether 9, the latter proceeding with anchimericassistance of the metal, can be understood assuming a stepwise reaction path through radical intermediates. The proposed intermediate transition-metal benzophenone ketyl
Suzuki Reactions with B-Allyl-9-Borabicyclo[3.3.1]nonane (B-Allyl-9-BBN)
作者:Alois Fürstner、Günter Seidel
DOI:10.1055/s-1998-1590
日期:1998.2
Generally referred to as Suzuki reactions, these transformations exhibit an unrivaled compatibility with functional groups in both reaction partners and represent environmentally benign processes with considerable appeal for the preparation of pharmacologically active compounds and the production of fine chemicals.3 In order to widen the scope of Suzuki-type reactions, we have recently described a complementary
在催化量的 Pd(0) 配合物存在下,用 KOMe 处理 Ballyl-9-BBN 形成的硼酸盐配合物混合物很容易发生 Suzuki 反应,从而将它们的烯丙基部分转移到芳基溴化物、碘化物或三氟甲磺酸酯。在碱存在下,钯催化芳基卤化物、三氟甲磺酸酯或重氮盐与各种有机硼衍生物的交叉偶联成为近年来最流行的 CC 键形成方法之一。 1,2 通常称为 Suzuki 反应,这些转化与两个反应伙伴中的官能团表现出无与伦比的兼容性,代表了环境友好的过程,对制备药理活性化合物和生产精细化学品具有相当大的吸引力。 3 为了扩大铃木型反应的范围,我们最近描述了一种使用 9-MeO-9-BBN 作为“穿梭”的补充协议,它允许转移超出传统设置范围的 ia 甲基-、TMSCH2 和炔基。 4,5 作为进一步的扩展,我们现在报告在铃木条件下转移烯丙基的第一个一般程序。钯催化的烯丙基硼衍生物的交叉偶联反应基本上是未知的。在
[EN] NOVEL ORGANOPOLYSILOXANE, SURFACE TREATMENT AGENT COMPRISING THE SAME, RESIN COMPOSITION COMPRISING THE SAME, AND GELATINOUS PRODUCT OR CURED PRODUCT THEREOF<br/>[FR] NOUVEL ORGANOPOLYSILOXANE, AGENT DE TRAITEMENT DE SURFACE LE COMPORTANT, COMPOSITION DE RÉSINE LE COMPORTANT ET SON PRODUIT GÉLATINEUX OU SON PRODUIT DURCI
申请人:DOW CORNING TORAY CO LTD
公开号:WO2015023001A1
公开(公告)日:2015-02-19
An organopolysiloxane represented by formula : R63Si-R5-[SiR42 O]n-Si R3(3-a)-[R2-R1]a (wherein R1 is a monovalent hydrocarbon group having a plurality of aromatic rings with 10 or more carbon atoms; R2 is a divalent hydrocarbon group which may contain a hetero atom or a direct bond to a silicon (Si) atom; each of R3 and R4 is independently a monovalent hydrocarbon group; R5 is a divalent hydrocarbon group which may contain a hetero atom, or an oxygen atom; each R6 is a group independently selected from alkyl groups, alkenyl groups, aryl groups, and alkoxy groups, n is an integer from 0 to 200; and a is an integer from 1 to 3); the use thereof as a surface treatment agent, and a resin composition comprising the organopolysiloxane and a functional filler.