Mass Spectrometric Investigation of H• and H₂ Transfer Reaction of Hydrocarbon Ions

Role of added olefins and oxygen in the gas-phase radiolysis of butane

“…Evidence for the occurrence of Hand H2-transfer reactions between an olefin molecule and a saturated hydrocarbon parent ion comes from chemical analysis of the stable end products formed in radiolysis and in photoionization experiments conducted by Ausloos, et al,6~7 and from recent photoionization mass spectrometric studies. [2][3][4] From the results obtained by the photoionization of n-C4Dio-C3H6-02 mixtures,6 the rate constant ratio ki/ks at higher pressures may be derived to be ~0.1.10 Using 0.1 for /c4/fc3, one can obtain ^0.2 as the G value of the propyl radicals resulting from H-transfer reaction 4. Thus, the G value of the n-butane parent ion at 900 mm is estimated to be 1.7, which is the sum of the G values of propane produced via reaction 3 and propyl radicals produced via reaction 4. A recent mass spectrometric study11 has provided evidence that the propane parent ion reacts wdth hydrogen sulfide via charge-and proton-transfer reactions.…”

“…C"H2" + RH2+ -C"H2k+2 + R+ (2) where C"H2" and RH2+ denote olefin molecule and alkane parent ion, respectively. Since the yield of the unimolecular hydrogen formed in the gas-phase radiolysis of propane decreased appreciably upon the addition of ethylene, we have also suggested in a previous paper8 that ethylene may interact with unspecified ionic species.…”

Kinetic mass spectrometric investigation of the ion-molecule reactions occurring in C4 and C5 alkanes following photoionization at 106.7 and 104.8 nm

“…Therefore, we may ass um e th at thi s ion has onl y one s truc ture, CH3CHCHt, at th e tim e o f reac tio n. Th e total ra te co nstants for reac ti on of C:IH t with th e various alkanes giv e n in ta bl e 2 agree well with those obtained for reac tion of C;J Dt formed by photoi onization of propyle ne-dl; with 10 eV photons [lb] in th e presence of C4 a nd C5 alkanes. In th e case of i-butane, for which two reaction c hann els are po ss ible: th e ratio k(H -)/k(Hz ) was found to be 1.26 in the prese nt study, a nd 1.30 in th e pre vi ous in ves ti gati on involvin g C1Dt-Ass uming tha t k, /k2 is depe ndent on the intern al e ner gy of the pro pyle ne io n (a d e pend e nce o n kin e ti c e ne rgy has bee n es ta bli shed [9]) thi s agreeme nt would indi cate th a t th e intern al e ne rgy co ntent of th e pro pyle ne ion res ultin g from th e unim olec ular deco mpos ition of buta ne does not diffe r ap preciably fro m that form e d in th e p hotoio ni zation of pro pylen e at 123_6 nm.…”

Can psychedelics have a role in psychiatry once again?

“…In the treatment of addiction, repeated controlled experiments demon-repeated controlled experiments demonstrated a consistent recovery and 6-month strated a consistent recovery and 6-month abstinence from drinking in abstinence from drinking in 50-90% of 50-90% of participants after brief psychedelic therapy participants after brief psychedelic therapy (Abramson, 1967;. Another (Abramson, 1967;. Another area where therapy was used successfully area where therapy was used successfully was in relieving pain and anxiety in was in relieving pain and anxiety in terminal cancer .…”