Practical, mild and efficient electrophilic bromination of phenols by a new I(<scp>iii</scp>)-based reagent: the PIDA–AlBr<sub>3</sub>system
作者:Yuvraj Satkar、Velayudham Ramadoss、Pradip D. Nahide、Ernesto García-Medina、Kevin A. Juárez-Ornelas、Angel J. Alonso-Castro、Ruben Chávez-Rivera、J. Oscar C. Jiménez-Halla、César R. Solorio-Alvarado
DOI:10.1039/c8ra02982b
日期:——
Its stability at 4 °C after preparation was confirmed over a period of one month and no significant loss of its reactivity was observed. Additionally, the gram-scale bromination of 2-naphthol proceeds with excellent yields. Even for stericallyhindered substrates, a moderately good reactivity is observed.
A total synthesis of benzodioxole derivative 1 was achieved via a palladium(0)-catalyzed cross-coupling reaction in a 68% overall yield (4 steps). A novel series of benzodioxoles bearing a variety of aromatic and heterocyclic rings was also prepared and the antioxidative activity evaluated using in vitro model systems. Structure-activity studies revealed that i) intramolecular hydrogen-bonding in the
Benzyne 1,2,4-Trisubstitution and Dearomative 1,2,4-Trifunctionalization
作者:Jiarong Shi、Lianggui Li、Chunhui Shan、Zhonghong Chen、Liang Dai、Min Tan、Yu Lan、Yang Li
DOI:10.1021/jacs.1c04389
日期:2021.7.21
4-trifunctionalization of benzyne have been accomplished from sulfoxides bearing a penta-2,4-dien-1-yl moiety. These cascade transformations proceed through a benzyne insertion into the S═O bond and an uncommon regiospecific anionic [4,5]-sigmatropic rearrangement, furnishing a C–O, C–S, and C–C bond on the C1-, C2-, and C4-position of a benzene ring, respectively. This study showcases new cascade benzyne reaction
ELECTROCHROMIC COMPOSITION AND ELECTROCHROMIC ELEMENT
申请人:CANON KABUSHIKI KAISHA
公开号:US20170114274A1
公开(公告)日:2017-04-27
An electrochromic composition has an anodic electrochromic compound and a cathodic electrochromic compound, in which the anodic electrochromic compound is represented by General Formula [1]
and the cathodic electrochromic compound is represented by General Formula [2]
In General Formula 1, A
1
to A
4
represent substituents, R
1
and R
2
, and R
20
and R
21
represent a hydrogen atom or a substituent. n is an integer of 1 to 5. X represents a thiophene derivative and Y- represents an anion.
A transition-metal-free three-phase four-component couplingreaction (3P-4CR) involving KCl, arynes, chloroalkanes and CO2 has been reported for the first time, enabling the incorporation of both chloro and CO2 into an aryne simultaneously. The reactions for the synthesis of different types of o-chloro benzoates can be selectively modulated by the chloroalkane utilized. The corresponding products can