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A short, practical stereospecific synthesis of triphenylphosphonium salts bearing an l-(N-benzoyl)-alanyl substituent from l-serine is described. The key step is the ring opening of an oxazoline salt derived from serine with trimethylsilyl halide, giving β-bromo or β-iodo alanine, which were used for the quaternization of triphenylphosphine. The phosphonium salts were obtained in 80% overall yield...
Radiative properties are wavelength dependent; they characterize the material and the spectrum is its fingerprint. The scattering is controlled by the physical aspect of the material and, for example, radiative properties are affected by the surface state of the sample, the particle size in case of powders, the aspect ratio (length) and the orientation of the fibers in case of fibrous materials....
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