Subject phosphine sulfides

The ring-chain isomerisation of phosphino-substituted triazolo-pyridines was found to depend on the nature of the phosphine substituent. Conversion of the phosphines to their selenides resulted in a complete shift of the equilibrium towards electron-acceptor structure D (Scheme 10). Acenaphthene and acenaphthylene were converted to polycyclic phosphole derivatives via Ti(II)-mediated cyclization of the corresponding dialkynylated arenas. The related phosphole oxides were stable species (Scheme 11). Asymmetric lithiation of dimethyl-tert-butylphosphine sulfide and trimethylsilylation gave an intermediate that was subjected to a five-step reaction sequence including metallation, P-functionalization (in three steps) and removal of the silyl group to yield the precursor of Mini-PHOS (Scheme 12). ... 

This is carried out by operating a chemiluminescent NOj analyzer (cf. NO, analysis) at a NO excess condition. As the reaction of ozone with NO is faster and gives more intense CL than that with ethene, this method is preferred for some purposes in which a fast response is required (i.e., aircraft flux measurements). However, this CL method is subject to interference from water vapor and may contaminate the environment with NO. The ozone-NO reaction is also known as a gas-phase titration reaction, in which sample gas is mixed with a low-concentration standard NO gas and the NO2 formed in quantities equivalent to ozone is determined by an appropriate method. While CL reactions of ozone with other alkenes, alkyl sulfides, phosphine, arsine, and stibine... 

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