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We have used seven different techniques to measure the anisotropic refractive index of poly(vinylcarbazole) films. These techniques are: two types of variable angle spectroscopic ellipsometry (VASE) with multiple sample analysis, Interference enhanced VASE, Transmittance combined with VASE, Polarised Reflectance, beta‐scan VASE, and prism coupling. We have found the average ordinary and extraordinary indices at 633 nm to be no = nTE = 1.675 ± 0.008, and ne = nTM = 1.722 ± 0.018, respectively, consistent amongst methods and conclusive on the magnitude of Δn in polymer films. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

better reactants than are the chlorinated compounds 111. In this way ethyldifluoroborane and lithium in tetrahydrofuran at ca. 0 "C afford two types of carborane:, each containing fivs boron atoms per molecule and carrying alkyl groups on carbon as well as on boron. The total yield amounts to 7 to 8 g per 78 g of C2H5BF2. About 25 7; of the B-ethyl groups

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