1006-47-9Relevant articles and documents
Synthesis of 7,7′-Dihydroxy-8,8′-biquinolyl (azaBINOL) via Pd-catalyzed directed double C-H functionalization of 8,8′-biquinolyl: Emergence of an atropos from a tropos state
Wang, Chao,Flanigan, Darrin M.,Zakharov, Lev N.,Blakemore, Paul R.
, p. 4024 - 4027 (2011)
7,7′-Dihydroxy-8,8′-biquinolyl (azaBINOL) was prepared from 2-chloroaniline in four steps: (1) the Skraup reaction, (2) Ni-catalyzed reductive coupling of 8-chloroquinoline, (3) Pd(II)-catalyzed double C-H functionalization of 8,8′-biquinolyl mediated by
Relative Reactivities of Three Isomeric Aromatic Biradicals with a 1,4-Biradical Topology Are Controlled by Polar Effects
Ma, Xin,Jin, Chunfen,Wang, Duanda,Nash, John J.,Kentt?maa, Hilkka I.
, p. 6355 - 6361 (2019)
Unexpectedly, the 5-dehydroquinoline radical cation was formed in the gas phase from the 5-iodo-8-nitroquinolinium cation upon ion-trap collision-activated dissociation. This reaction involves the cleavage of a nitro group to generate an intermediate monoradical, namely, the 8-dehydro-5-iodoquinolinium cation, followed by rearrangement through abstraction of a hydrogen atom from the protonated nitrogen atom by the radical site. Dissociation of the rearranged radical cation through elimination of an iodine atom generates the 5-dehydroquinoline radical cation. The mechanism was probed by studying isomeric biradicals and performing quantum chemical calculations. The 5-dehydroquinoline radical cation showed greater gas-phase reactivity toward dimethyl disulfide, cyclohexane, and allyl iodide than the isomeric 5,8-didehydroquinolinium cation, which is more reactive than the isomeric 5,8-didehydroisoquinolinium cation studied previously. All three isomers have a 1,4-biradical topology. The order of reactivity is rationalized by the vertical electron affinities of the radical sites of these biradicals instead of their widely differing singlet–triplet splittings.
Generation of Organozinc Reagents by Nickel Diazadiene Complex Catalyzed Zinc Insertion into Aryl Sulfonates
Klein, Philippe,Lechner, Vivien Denise,Schimmel, Tanja,Hintermann, Lukas
supporting information, p. 176 - 180 (2019/12/11)
The generation of arylzinc reagents (ArZnX) by direct insertion of zinc into the C?X bond of ArX electrophiles has typically been restricted to iodides and bromides. The insertions of zinc dust into the C?O bonds of various aryl sulfonates (tosylates, mesylates, triflates, sulfamates), or into the C?X bonds of other moderate electrophiles (X=Cl, SMe) are catalyzed by a simple NiCl2–1,4-diazadiene catalyst system, in which 1,4-diazadiene (DAD) stands for diacetyl diimines, phenanthroline, bipyridine and related ligands. Catalytic zincation in DMF or NMP solution at room temperature now provides arylzinc sulfonates, which undergo typical catalytic cross-coupling or electrophilic substitution reactions.
Push-pull isomers of indolizino[6,5,4,3-: Def] phenanthridine decorated with a triarylboron moiety
Dong, Lei,Saraci, Felix,Yuan, Kang,Wang, Xiang,Wang, Suning
supporting information, p. 6170 - 6477 (2019/07/09)
1,3-Dipolar cycloaddition reactions between a new azomethine ylide and three BPhMes2-functionalized internal alkynes produced three pairs of fluorescent push-pull regioisomers, which show distinct electronic and photophysical properties. All the six compounds are found to exhibit charge-transfer (CT) fluorescence, and some of which show rare and interesting temperature "turn-on" fluorescence.
