Rate constants for the reaction of the bromomethyne radical with alkynes

Direct detection of pyridine formation by the reaction of CH (CD) with pyrrole: a ring expansion reaction

“…5 To our knowledge, kinetic data on the reactions of brominated radical species with pyrrole are unavailable. But, the reaction rate coefficients of the bromomethylidyne radical (CBr) with alkenes and alkynes at room temperature have been measured and found to be much smaller (o10 À12 cm 3 molecule À1 s À1 ) [31][32][33] than for analogous reactions with the CH radical (B10 À10 cm 3 molecule À1 s À1 ). 34,35 Based on these observations, it is reasonable to assume that the reaction of CBr with pyrrole is at least 100 times slower than the CH with pyrrole reaction.…”

Reaction of carbon atoms, C (2p2, 3P) with C3H4(allene and methylacetylene), C3H6(propylene) and C4H8(trans-butene): Overall rate constants and atomic hydrogen branching ratios.

“…CBr concentration is lower by, at least, a factor ten compared to the carbon concentration, and the rate constants for the reactions with hydrocarbons are at least, 100 times lower than the C rate constants. 20,21 C 2 concentration is lower by a factor. 20 Thus they only can play a very minor role in our experimental conditions.…”

“…20,21 C 2 concentration is lower by a factor. 20 Thus they only can play a very minor role in our experimental conditions. Then, we have also to take into account the reaction of the products of the studied C reaction, with the hydrocarbons.…”

Product Detection of the CH Radical Reactions with Ammonia and Methyl-Substituted Amines

“…28,52 The three body reaction of the CH ( 2 , v=0) radical with molecular nitrogen is slow 53 at the pressure of the flow and is unlikely to affect the observed product distributions. Reactions of CBr with small unsaturated hydrocarbons are several orders of magnitude slower at the present temperature 46,47,50,[54][55][56] than those for reactions of the CH radical. 54,55,57,58 Similarly slow kinetics between CBr and amines would allow discriminating between CBr and CH reaction products.…”

“…The vibrationally excited CH­(Χ 2 Π, v = 1) radicals are efficiently quenched by adding nitrogen to the main flow. , The three-body reaction of the CH (Χ 2 Π, v = 0) radical with molecular nitrogen is slow at the pressure of the flow and is unlikely to affect the observed product distributions. Reactions of CBr with small unsaturated hydrocarbons are several orders of magnitude slower at the present temperature ,,,− than those for reactions of the CH radical. ,,, Similarly, slow kinetics between CBr and amines would allow discriminating between CBr and CH reaction products. At 248 nm the singlet CHBr carbene is expected to be formed in very low concentrations compared to the CH radical .…”