O + CN reaction

Both the CO and N atom products have been observedfrom the O + CN reaction. The bimodal CO distribution is a consequence of two exit channels forming CO and N( S) or N( D) with < > of 11 and 22 kcal mole respectively. The N( D)/N( S) ratio is 4. Deconvolution of the bimodal CO vibrational distribution gives a vibrational distribution for each channel. The v = 0-3 populations from the N( D) channel correspond to Ty = 5700 K and = 0.2 the distribution for the higher CO levels corresponding to N( S) formation is strongly inverted and = 0.5. The N( D) channel is thought to proceed via dissociation of the bound NCO radical whereas, the N( S) channel involves direct reaction on a repulsive potential. Classical trajectory calculations on two empirical surfaces selected to represent the two types of reaction generally support the two-channel interpretation. The CO v) distribution from the direct component of the O + CN reaction appears to be very similar to that for O + CS or CSe. 

The reaction of Ph 3P=CH2 with benzoyl isocyanate takes place in a 1 2 ratio with loss of benzene to afford the ylide 173 <71JOC2029> and treatment of either Ph3P=CHC02Me or Ph3P=CHC02Et with aryl cyanates, Ar-O-CN, results in formation of the pyrimidine ylides 174 <67CB187>. An alternative means of access to 171 (R = cyclohexyl) is provided by... 

Exercise 24-11 Nitriles of the type RCH2CN undergo a self-addition reaction analogous to the aldol addition in the presence of strong bases such as lithium amide. Hydrolysis of the initial reaction product with dilute acid yields a cyanoketone, O CN... 

The nucleophile 185 appeared also to be very reactive under photostimulation. Good percentage of substitution was obtained in its reaction with p-CN, o-CN, o-CONH2, o-COCH3 and 0-OCH3 substituted bromobenzenes261. 

An important facet of IS cloud composition is that laboratory-unstable species (e.g. H, C, N, O, CN, HNC, c-C3H2) are often highly abundant, and the reaction chemistry of such species is a challenging field of study. This is particularly true... 

Complex hydride reductions of Nj, N O, [CN] and nitriles in reactions containing complex mixtures of metal-ion species produce N—H bonded products " by reactions that may relate to those of the biological nitrogenases". Complete reaction stoichiometries are not well established. These reactions are not competitive with other methods for NH or amine synthesis. Nitrogen reacts in H O with a mixture of NaBH, S-donor ligands (e.g., NH CjM SH) and Mo and Fe salts to form NHj and NjH in low yield . In similar systems, nitriles and isonitriles are reduced to NHj and amines in low yield . 

Fig. 4.20 shows schematically the accommodation along the x-axis. Mass accommodation occurs when a gas molecule strikes the particle surface for solid particles adsorption and surface chemistry almost occurs and for hydrometeors absorption (dissolution) and aqueous phase chemistry must be considered (Fig. 4.19). The uptake of molecules into droplets lowers the surface concentration ((Cat)o < cN)g < (ctv) J and results in a subsequent gas phase diffusion to the surface because of the concentration gradient. The mass accommodation coefficient a is the probability that a molecule that strikes the particle surface is adsorbed or enters the liquid. In a further application of the resistance model, we split the net uptake into two processes in series adsorption and dissolution (with possibly aqueous phase chemical reaction see later). Poschl et al. (2005) proposed the term surface accommodation coefficient for a.

Organoborane R3B or B-R-9-BBN Chloronitrile CI2CHCN or RCH(C1)CN Reaction conditions Temp Time ( O (h) Product Yield (%)... 

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