Bis ytterbium

NOL-based systems for addition of (substituted) anilines to meso epoxides. Hou found that a ytterbium-BI NO L complex catalyzed desymmetrization of cyclohexene oxide in up to 80% ee [15], Shibasaki demonstrated that a praseodymium-BINOL complex could promote addition of p-anisidine to several epoxides in moderate yields with modest enantioselectivities (Scheme 7.7) [16]. 

Kashiwazaki67 has fabricated a complementary ECD using plasma-polymerized ytterbium bis(phthalocyanine) (pp—Yb(Pc)2) and PB films on ITO with an aqueous solution of 4M KC1 as electrolyte. Blue-to-green electrochromicity was achieved in a two-electrode cell by complementing the green-to-blue color transition (on reduction) of the pp—Yb(Pc)2 film with the blue (PB)-to-colorless (PW) transition (oxidation) of the PB. A three-color display (blue, green, and red) was fabricated in a three-electrode cell in which a third electrode (ITO) was electrically connected to the PB electrode. A reduction reaction at the third electrode, as an additional counter electrode, provides adequate oxidation of the pp Yb(Pc)2 electrode, resulting in the red coloration of the pp—Yb(Pc)2 film. 

A recent report on bimetallic ytterbium bis(amides) 116 and 117 stabilized by a flexible bridged bis(phenolato) ligand claimed a straightforward polymerization of L-lactide. The conversion is characterized by short reaction times (30 min to 2 h) and PLAs displaying broad PDls (1.71-2.24). The reason for the apparent enhancement of the activity found in the bimetallic lanthanide amides is tentatively explained by cooperative effects within these bimetallic systems [114]. 

Cl2Li02Si4YbC2oH , Ytterbium, bis(t) -l,3-bis(trimethylsilyl)cyclopentadienyl]di-(t-chloro-bis(tetrahydrofuran)lithium-, 27 170... 

N20,Si4YbCnH4 , Ytterbium, bis[bis(tri-methylsilyl)amido]bi (diethyl ether)-, 27 148... 

The reaction between YbU and K[Sn(CH2Bu)3] affords the diamagnetic ytterbium bis-stannyl derivative Yb(SnNep3)2(thf)2 (Nep = 2,2-dimethylpropyl) (33). On the other hand, the reaction of naphthaleneyt-... 

An unprecedented functional Yb silsesquioxane was obtained as outlined in Scheme 29.12. Trisilanol 1 was lithiated in situ using an excess of LiN(SiMe3)2, followed by treatment with YbCfi. In bimetallic 44, a reactive ytterbium bis(trimethylsilyl)amide unit resides on a model silica surface formed by two lithium-linked silsesquioxane cages. 

LiSi4YbCjoH , Ytterbium, bis(V-l,3-bis(trimethylsilyl)cydopentadienyl]di-p.-diloro-bis(tetrahydrofuran)lithiuffl-,... 

Aroca, R., R.E. Clavijo, C.A. Jennings, G.J. Kovacs, J.M. Duff, and R.O. Loutfy (1989). Vibrational spectra of lutetium and ytterbium bis-phthalocyanine in thin solid films and SER(R)S on silver island films. Spectrochim. Acta A 45, 957. 

OjCljLiScSuCjoHsg (Continued) hydrofuran)lithium-, 27 170 OjCljLiSigYCjoHss, Yttrium, bis[ij -l,3-bis(trimethylsilyl)cyclopenta-dienyl]di-/i-chloro-bis(tetrahydro-furan)lithium-, 27 170 OjQjLiSigYbCjoHjg, Ytterbium, bis[i -l,3-bis(trimethylsilyl)cyclo-pentadienyl]di-/i-chloro-bis(tetrahydro-furan)lithium-, 27 170 OjCIgSmCgHig, Samarium,... 

YO3C43HS3, Yttriuni, triis(2,6-di-tert-butylphcnoxo)-, 27 167 YO3C45H69, Yttrium, tris(2,6-di-tert-butyl-4-methylphenoxoK 27 167 YjCljSigCggHgg, Yttrium, tetrakis[ii -l,3-bis(trimethylsilyl)cyclopentadienyl]di- -chloro-di-, 27 171 YbC,gH,o, Ytterbium(IIX bis(phenylethynyl)-, 27 143 YbCl2Li02Si4C3oH5g, Ytterbium, bis[ -... 

The base-free ytterbium bis[bis(trimethylsilyl)amide] is dimeric [23]. The interaction of this dimeric compound with Me Alj in pentane gives the bimetallic complex [(Me3Si)2N]2Yb(AlMe3)2, in which there are four Yb-Me-Al and two Yb-Me-Si fragments [25]. The Fig.VI.5 shows that the complex is formed by connection of... 

Trimethylaluminium reacts with base-free ytterbium bis[bis(tri-... 

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