Process for preparing vinyl substituted beta-diketones
申请人:Southard E. Glen
公开号:US20060069288A1
公开(公告)日:2006-03-30
A process for preparing vinyl substituted beta-diketones includes reacting a halogen-containing beta-diketone with an olefin in a reaction zone under Heck coupling reaction conditions in the presence of a catalyst, a base, and an organic phosphine to provide a vinyl substituted beta-diketone product.
Transition-Metal Aqua Complexes of 4,6-Dibenzofurandiyl-2,2‘-bis(4-phenyloxazoline). Effective Catalysis in Diels−Alder Reactions Showing Excellent Enantioselectivity, Extreme Chiral Amplification, and High Tolerance to Water, Alcohols, Amines, and Acids
作者:Shuji Kanemasa、Yoji Oderaotoshi、Shin-ichi Sakaguchi、Hidetoshi Yamamoto、Junji Tanaka、Eiji Wada、Dennis P. Curran
DOI:10.1021/ja973519c
日期:1998.4.1
from nickel(II) perchlorate hexahydrate has an octahedral structure with three aqua ligands, and it can be isolated and stored for months without loss of catalytic activity. Iron(II), cobalt(II), copper(II), and zinc(II) complexes are similarly active. The absoluteconfiguration induced in the reaction can be readily predicted on the basis of the C2-symmetric structure of the complexes as well as the
阳离子水配合物由反式螯合三齿配体 (R,R)-4,6-二苯并呋喃二基-2,2'-双(4-苯基恶唑啉) (DBFOX/Ph) 和各种过渡金属 (II) 制备高氯酸盐。这些配合物是环戊二烯与 3-烯酰基-2-恶唑烷酮亲二烯体的 Diels-Alder 反应的有效催化剂,并显示出优异的对映选择性。由六水合高氯酸镍 (II) 制备的活性催化剂配合物具有八面体结构和三个水配体,可以分离和储存数月而不会损失催化活性。铁 (II)、钴 (II)、铜 (II) 和锌 (II) 配合物具有类似的活性。根据配合物的 C2 对称结构以及底物配合物的简单结构,可以很容易地预测反应中诱导的绝对构型。由 Ni(II) 或 Zn(II) 高氯酸盐制备的水络合物在 Diels-Alder 反应中产生高效的手性放大。使用 DBFOX/Ph 配体...
Fe(OTf)<sub>2</sub>
-Catalyzed <i>Thia</i>
-Michael Addition Reaction: A Green Synthetic Approach to β-Thioethers
A convenient Fe(OTf)2-catalyzed Michael additionreaction of thiols to α,β-unsaturated carbonyl compounds was developed. The use of a simple procedure (EtOH, room temperature, air atmosphere) allowed to set up effective green catalytic conditions for the C–S bond formation. The scope of the reaction was demonstrated using various substituted thiols and original Michael acceptors. The corresponding
Organic polymers having water contact angles of 20° or smaller, preferably 7° or smaller and equipped with both high wettability and high transparency. The organic polymers may contain as partial structures polar structures of about 3 debyes or higher in dipole moment and are available especially from polymerization of polymerizable compounds having alkylene(thio)urea structures.
Rate constants for the additions of cyclohexyl radicals to acrylamides imides and sulfonimides
作者:Dennis P. Curran、Qi Hongyan、Ned A. Porter、Su Qi、Wu Wen-Xue
DOI:10.1016/0040-4039(93)88066-r
日期:1993.7
Competition experiments are used to provide estimated rate constants for the addition of cyclohexylradical to a series of acrylamides, imides and sulfonimides.