| 中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
|---|---|---|---|---|
| —— | cis-4,4'-dicyanostilbene | 2510-73-8 | C16H10N2 | 230.269 |
| (E)-4-(对氨基苯)乙烯 | (E)-4,4'-diaminostilbene | 7314-06-9 | C14H14N2 | 210.279 |
| 对甲苯腈 | 4-methylbenzonitrile | 104-85-8 | C8H7N | 117.15 |
| 1-氯-4-[2-(4-氯苯基)乙烯基]苯 | (E)-1,2-di(4-chlorophenyl)ethene | 5121-74-4 | C14H10Cl2 | 249.139 |
| 4,4'-二溴-反-芪 | (E)-4,4'-dibromostilbene | 18869-30-2 | C14H10Br2 | 338.041 |
| 中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
|---|---|---|---|---|
| 4,4'-二苯甲醛基乙烯 | (E)-1,2-bis-(p-phenylaldehyde)ethene | 84907-53-9 | C16H12O2 | 236.27 |
| —— | Stilbene-4,4'-dicarbonyl Dichloride | 52238-17-2 | C16H10Cl2O2 | 305.16 |
Nine substituted sulfonyl-stabilized phosphorus ylides were prepared by treating their intermediate ylide analogues with phenylmethanesulfonyl fluoride. The stoichiometric ratio of the reactants for each preparation needed to be adjusted according to the basicity of each ylide intermediate. The nine ylide compounds were then subjected to conventional (sealed-tube) gas-phase pyrolysis at 470545 K. The pyrolytic reactions were homogeneous and obeyed a first-order rate equation. The values of the Arrhenius log A (s1) and Ea (kJ mol1) obtained for these reactions averaged 11.12 ± 2.00 and 131.8 ± 24.4, respectively. Analysis of the pyrolysates from conventional pyrolysis and from flash vacuum pyrolysis at 600 K showed the products to be complex mixtures of triphenylphosphine, triphenylphosphine oxide, triphenylphosphine sulfide, and symmetric and unsymmetric alkenes. Conventional pyrolysis also gave novel mixed sulfones and, for the p-methoxyaryl substituent, p-anisaldehyde. The products of the reactions under study are explained on the basis of a mechanism involving a sulfonyl carbene intermediate, and the reaction mechanism is used to rationalize the kinetic results and molecular reactivities.Key words: ylides, synthesis, pyrolysis, kinetics, mechanism.