Neue synthesen und reaktionen ungesättigter heterotitanacyclen
作者:Stefan Dürr、Udo Höhlein、Rainer Schobert
DOI:10.1016/0022-328x(93)80460-s
日期:1993.10
fragment by carbon (formation of vinylenic carbonates and the thia-derivatives of these) or by further heteroatoms like boron or phosphorus (formation of boroles and phosphoric acid derivatives), thus retaining the cyclofunctionality. Alternatively, some of the new chelate complexes can be readily CC-chain-lengthened via a deprotonating/alkylating sequence, leaving the metallacycle unaffected.
Transformation of acid chlorides into aldehydes by reduction of in-situ formed acyltributylphosphonium ions with zinc-copper couple or zinc
作者:Hatsuo Maeda、Toshihide Maki、Hidenobu Ohmori
DOI:10.1016/0040-4039(95)00262-b
日期:1995.3
Transformation of acid chlorides into the corresponding aldehydes without over-reduction to alcohols was effectively achieved by the reduction of acyltributylphosphonium ions, formed in-situ from the chlorides and tributylphosphine in CH3CN, with ZnCu couple or Zn in the presence of CH3SO3H under an N2 atmosphere.
通过还原在CH 3 CN中由氯化物和三丁基膦就地形成的酰基三丁基phosph离子,通过ZnCu对或Zn在CH存在下的还原,可以有效地实现酰基氯转化为相应的醛而不过度还原为醇。3 SO 3的N在H 2气氛。
Synthesis of (Z)-stilbendiol dibenzoate by sensitized photooxygenation of 2,3,5,6-tetraphenyl-p-dioxin
作者:Luigi Lopez
DOI:10.1016/s0040-4039(00)98741-0
日期:1985.1
Sensitizedphotooxygenation of 2,3,5,6-tetraphenyl-p-dioxin with singlet and triplet excitable sensitizers yields (Z)-stilbendiol dibenzoate together with benzil. Experimental proofs show that unconnected mechanisms could operate accounting for the 1,2 -diketone and the endiol diester formation.
Reaction of Organic Tin(II) Compound with Carbonyl Compound
作者:Ikuko Wakeshima、Ichiro Kijima
DOI:10.1246/bcsj.54.2345
日期:1981.8
The reactions of organic tin(II) compounds bearing Sn–OC bonds with carbonyl compounds, C6H5COR (R=C6H5CO, C6H5, and H) and p-benzoquinone, have been investigated. The tin(II) compound reacted with benzil and p-benzoquinone to yield the corresponding oxidative addition products. However, the oxidative addition reaction did not occur in benzophenone and benzaldehyde.
已经研究了带有 Sn-OC 键的有机锡 (II) 化合物与羰基化合物 COR(R= CO、C6H5 和 H)和对苯醌的反应。锡 (II) 化合物与苄基和对苯醌反应生成相应的氧化加成产物。然而,氧化加成反应在二苯甲酮和苯甲醛中没有发生。
Catalyst components for the polymerization of olefins
申请人:BASELL POLIOLEFINE ITALIA S.R.L.
公开号:US10246532B2
公开(公告)日:2019-04-02
A solid catalyst component which exhibits high activity and stereospecificity in the polymerization of olefins made from or containing Mg, Ti and an electron donor of formula (I)
where R and R1 are selected from the group consisting of C1-C20 hydrocarbon groups, C6-C14 aryl or alkylaryl groups hydrocarbon groups, optionally containing a heteroatom selected from the group consisting of halogens, P, S, N, and O; R2 to R11 groups, equal to or different from each other, are hydrogen, halogen or C1-C15 hydrocarbon groups which can be optionally fused together to form one or more cycles with the proviso that R6 and R11 cannot join together to form a phenyl ring.