Photoinduced C−N Bond Cleavage in 2-Azido-1,3-diphenyl-propan-1-one Derivatives: Photorelease of Hydrazoic Acid
作者:Rodney F. Klima、Abhijit V. Jadhav、Pradeep N. D. Singh、Mingxin Chang、Christine Vanos、Jagadis Sankaranarayanan、Mai Vu、Nazarin Ibrahim、Elaine Ross、Shaun McCloskey、Rajesh S. Murthy、Jeanette A. Krause、Bruce S. Ault、Anna D. Gudmundsdóttir
DOI:10.1021/jo070558q
日期:2007.8.1
absorption (λmax = ∼310 nm) due to the formation of radicals 4a and 4b, respectively, which have lifetimes of ∼14 μs at ambient temperature. TD−DFT calculations (B3LYP/6-31+G(d)) reveal that the first and second excited states of the triplet ketone (T1K (n,π*) and T2K (π,π*)) in azide 1a are almost degenerate, at ∼74 and 76 kcal/mol above the ground state (S0), respectively. Similarly, azide 1b has T1K
在甲苯中光解3-azido-1,3-diphenyl-propan-1-one(1a)产生1,3-diphenyl-propen-1-one(2),而辐照3-azido-2,2-dimethyl -1,3-二苯基-丙烷-1-酮(1b)导致主要形成2,2-二甲基-1,3-二苯基-丙烷-1-酮。乙腈中1a,b的激光闪光光解(308 nm)分别由于形成自由基4a和4b而在瞬态吸收(λmax =〜310 nm),它们在环境温度下的寿命约为14μs。TD-DFT计算(B3LYP / 6-31 + G(d))表明三重酮的第一和第二激发态(T 1K(n叠氮化物1a中的(π*)和T 2K(π,π*))几乎退化,分别比基态(S 0)高约74 kcal / mol和76 kcal / mol 。类似地,叠氮化物1b分别具有高于S 0的T 1K和T 2K 75和82 kcal / mol 。计算出的用于裂解CN