以前未知的1,2-二氢-1-氮杂-2-硼菲是从2-溴-1-乙烯基萘仅三步合成的。已测试了这种新的BN菲和几种取代衍生物对溴和有机锂化合物的反应性。溴化以完全的区域选择性进行,得到适合于通过交叉偶联反应进一步官能化的溴取代的化合物。相对于菲,这个新的BN菲族显示出量子产率的显着提高(最高达ϕ F = 0.93)。
BN-Phenanthrenes: Synthesis, Reactivity, and Optical Properties
作者:Chen Zhang、Lei Zhang、Chao Sun、Wenfang Sun、Xuguang Liu
DOI:10.1021/acs.orglett.9b00530
日期:2019.5.17
available materials. Both parental BN-phenanthrenes are strongly fluorescent in solution. Their absorption and emission spectra are greatly dependent on the BN position and orientation. Moreover, the reactivities of the two series of BN-phenanthrenes toward electrophiles are completely different, and these species can be further functionalized by cross-coupling reactions.
A t-BuOCu-initiated reaction sequence of styrene borometalation and intramolecular imine addition has been achieved using a Cu(OTf)2/dppf combination as catalyst. The product of this reaction cascade is a useful 2,3-disubstituted indoline bearing a versatile boryl moiety and is formed with sole cis-selectivity. To account for the observation of the exclusive formation of cis-stereoisomers, a transition
Grease compostion for automobile electrical equipment auxiliary device and prelubricated rolling using the grease composition
申请人:Fujita Yasunobu
公开号:US20060073989A1
公开(公告)日:2006-04-06
To provide a grease composition for auxiliary machinery of automobile electrical component containing an aromatic ester oil-containing base oil having a specific diurea compound as a thickener blended therewith and a rolling bearing having the foregoing grease composition packed therein. The foregoing grease composition and rolling bearing do not generate abnormal noises even at an extremely low temperature of −40° C., have excellent seizure resistance even under a high temperature closed to 180° C., have excellent rust preventing performance, and are suitable especially for electrical parts and auxiliary machineries of engines, etc.
A grease composition is produced by mixing a thickener of a calcium sulfonate complex and a second thickener component (polyurea, a metallic soap, a complex metallic soap or an N-substituted terephthalamic acid metal salt) into a base oil. This grease composition is excellent in heat resistance, load carrying capacity, water resistance and lubricating life.
Moreover, a grease composition is produced by mixing a thickener of an N-substituted terephthalamic acid metal salt and a second thickener component (polyurea, a metallic soap or a complex metallic soap) into a base oil. This grease composition is excellent in heat resistance, oxidation stability and lubricating life.
Furthermore, a grease composition is produced by mixing a thickener of 10 to 90% by mass of polyurea and 90 to 10% by mass of a complex metallic soap into an ester oil having a kinematic viscosity at 40° C. of 20 to 180 mm
2
/s. This grease composition generates only a few dusts even at a high temperature and has excellent high-temperature performance.
Still further, a grease composition is produced by mixing a thickener of 10 to 90% by mass of polyurea and 90 to 10% by mass of a complex metallic soap into a base oil having a kinematic viscosity at 40° C. of 50 to 500 mm
2
/s. This grease composition has excellent performance under a high-speed and high-temperature environment and provides a rolling apparatus with excellent seizuring life.