The influencing factors and marketing strategies of developing telecommunication industry customer loyalty
作者:Li Li、Wengui Su、Jian Jiang
DOI:10.1145/1089551.1089697
日期:——
In this paper, we analyze the influencing factors of the customer loyalty and set up the relational assess model, then apply analytic hierarchy process to establish the relation weights which influence the customer loyalty. At last, by means of applied instances in telecommunication industry, we represent the internal relations between the influencing factor weights and the customer loyalty and put forward marketing strategies on product and customer divergences to develop the customer loyalty.
Influence of External Ligands and Auxiliaries on the Reactivity of Low-Valent Titanium in McMurry Reaction: Selectivity and Mechanistic Profile
作者:N. Balu、S. K. Nayak、A. Banerji
DOI:10.1021/ja9535221
日期:1996.1.1
auxiliaries also resisted deoxygenation completely to give the pinacols in higher yields and better diastereoselectivity, as compared to pyridine-modified LVT system. Amongst these modified reagents, the LVT−catechol (1:1) system was found to be the most efficient combination for total pinacolization of aromatic carbonyl compounds, even under refluxing conditions. The actual titanium reagent responsible
Magnesium‐Induced Pinacol Coupling of Aromatic Aldehydes and Ketones Under Ultrasound Irradiation
作者:Jian‐Sen Wang、Ji‐Tai Li、Zhi‐Ping Lin、Tong‐Shuang Li
DOI:10.1081/scc-200057305
日期:2005.5.1
Abstract The system of magnesium and magnesiumiodide can reduce some aromatic aldehydes and ketones to the corresponding pinacols in good yields within 10–60 min at room temperature under ultrasound irradiation.
Pinacol Coupling Reaction of Aromatic Aldehydes Mediated by Zn in Acid Aqueous Media Under Ultrasound Irradiation
作者:Jin‐Hui Yang、Ji‐Tai Li、Jun‐Ling Zhao、Tong‐Shuang Li
DOI:10.1081/scc-120028629
日期:2004.12.31
Abstract Pinacolcoupling of aromatic aldehydes by Zn powder in aqueous H2NSO3H or H3PO4 under ultrasound irradiation can lead to the corresponding pinacols in 14–88% yields.
redox-active titanium complex. Taking advantage of the well-tailored photoredox potential of this organic dye, the selective reduction of Ti(IV) to Ti(III) is achieved. These conditions enable the formation of the D,L (syn) diastereoisomer as the favored product of the pinacol coupling (d.r. > 20 : 1 in most of the cases). Moreover, employing a simply prepared chiral SalenTi complex, the new photoredox
频哪醇偶联反应是羰基化合物的还原偶联反应,在电子供体存在下通过形成酮基自由基进行,一步即可得到相应的 1,2-二醇。这种转化的光氧化还原形式已经使用不同的有机染料或光活性金属配合物在牺牲供体(例如叔胺或 Hantzsch 酯)的存在下完成。通常,这种反应性酮基自由基的均偶联既不是非对映选择性也不是对映选择性。在此,我们报道了由 5 mol% 的无毒、廉价且可用的 Cp 2 TiCl 2促进的芳香醛的高度非对映选择性频哪醇偶联反应。复杂的。允许完全控制非对映选择性的关键特征是在氧化还原活性钛络合物存在下使用吸收红色的有机染料。利用这种有机染料精心设计的光氧化还原电位,实现了将 Ti( IV ) 选择性还原为 Ti( III )。这些条件能够形成D , L ( syn ) 非对映异构体作为频哪醇偶联的有利产物(在大多数情况下,dr > 20:1)。此外,使用简单制备的手性 SalenTi 配合