Trimethylphosphine 534 Subject

Torsional barriers for trimethylphosphine derivatives (63) have been obtained from Raman spectra.56 Vibrational spectra for the uranyl nitrate complex of (63a) have been published.66 Complexes of triarylphosphine derivatives (64) with iodine,67 and of (64b) with metal halides,68 have been the subject of thermodynamic67 and spectroscopic67 68 study. 

Br0nsted acidity of zeolite protons is essential for catalytic reactions such as isomerization and cracking and has been studied extensively 15,264). Several characterization methods for acid sites in zeolites have been developed this subject has been covered in recent reviews (265,266). Pyridine and other basic molecules are often used in IR work as probe molecules for Brpnsted and Lewis acid sites (267). Trimethylphosphine has also been used as a probe for the determination of zeolite acidity by IR or NMR (96,268). 

Silatungstacyclopropane (35) is subject to addition reactions as well. Methanol, H2, and H-TMS all add to the metal-carbon bond. The first two reactions lead to metal hydrides while the last reagent gives a metallasilane. Trimethylphosphine addition to (35) causes attack of cyclopentadienide at silicon and cleaves the silicon-metal bond <90JA6405>. 

Organophosphines (6.21), like most trivalent phosphorus compounds, are usually very reactive substances. They are strongly nucleophilic - more so than the corresponding amines. Many organophosphines possess an unpleasant odour similar to that of parent phosphine, PHj itself, and they are rather toxic, particularly the lower members which are liquids at room temperature. AU phosphines are subject to oxidation and the simple mono and di alkylphosphines have a great affinity for atmospheric oxygen. Trimethylphosphine vapour is spontaneously inflammable in air. 

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